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Homonyms

IRMNG homonym list - genus level - Initial letter = "I" (441)

Please note, this is a provisional homonyms list from IRMNG on 2024-12-10, and is subject to change. It may include nomina nuda, rejected and otherwise non-current names, plus some published misspellings, in addition to homonyms that have been validly published. A small proportion of duplicate entries awaiting rationalisation may also be included.

Click on any genus name for additional details, as currently available.

Ianthe
     Ianthe Marseul, 1865 accepted as Janthe Marseul, 1865 (misspelling - incorrect original spelling)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Buprestidae (Family)
     Ianthe Bovallius, 1881 · Animalia (Kingdom) > Arthropoda (Phylum) > Malacostraca (Class) > Isopoda (Order) > Janiroidea incertae sedis (Family)
 Ianthe R.A. Salisbury, 1866 accepted as Hypoxis Linnaeus, 1759 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Asparagales (Order) > Hypoxidaceae (Family)

Iasis
 Iasis Lahille, 1890 accepted as Soestia Kott, 1998 · Animalia (Kingdom) > Chordata (Phylum) > Thaliacea (Class) > Salpida (Order) > Salpidae (Family)
     Iasis Savigny, 1816 · Animalia (Kingdom) > Chordata (Phylum) > Thaliacea (Class) > Salpida (Order) > Salpidae (Family)

Iberina
     Iberina Simon, 1881 · Animalia (Kingdom) > Arthropoda (Phylum) > Arachnida (Class) > Araneae (Order) > Hahniidae (Family)
     Iberina Munier-Chalmas, 1902 † (uncertain)· Protozoa (Kingdom) > (Phylum) > Protozoa (awaiting allocation) (Class) > (Order) > (Family)

Iberis
 Iberis J. Hill, 1756 accepted as · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Brassicales (Order) > Brassicaceae (Family)
     Iberis Linnaeus, 1753 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Brassicales (Order) > Brassicaceae (Family)

Iberocarterus
     Iberocarterus Csiki, 1932 accepted as Eocarterus Stichel, 1923 (nomen nudum)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Carabidae (Family)
 Iberocarterus Antoine, 1959 accepted as Eocarterus Stichel, 1923 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Carabidae (Family)

Iberocypris
     Iberocypris Babinot, 1985 † (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Ostracoda (Class) > Ostracoda (awaiting allocation) (Order) > Ostracoda (awaiting allocation) (Family)
     Iberocypris Doadrio, 1980 · Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Cypriniformes (Order) > Cyprinidae (Family)

Iberodinodes
 Iberodinodes Basilewsky & Grundmann, 1954 accepted as Chlaenius Bonelli, 1810 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Carabidae (Family)
 Iberodinodes Wagner, 1932 accepted as Chlaenius Bonelli, 1810 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Carabidae (Family)

Iberospongia
     Iberospongia García-Bellido, 2002 † accepted as Iberospongia García-Bellido, 2002 † (nomen nudum)· Animalia (Kingdom) > Porifera (Phylum) > Hexactinellida (Class) > Reticulosa (Order) > Protospongiidae (Family)
     Iberospongia Garcia-Bellido & Rigby, 2004 † (uncertain)· Animalia (Kingdom) > Porifera (Phylum) > Hexactinellida (Class) > Reticulosa (Order) > Protospongiidae (Family)

Iberozabrus
 Iberozabrus Ganglbauer, 1931 accepted as Zabrus Schellenberg, 1806 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Carabidae (Family)
 Iberozabrus Jeannel, 1942 accepted as Zabrus Schellenberg, 1806 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Carabidae (Family)

Ibidiomorphum
 Ibidiomorphum Blessig, 1873 accepted as Olenecamptus Chevrolat, 1835 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Cerambycidae (Family)
 Ibidiomorphum Gemminger & Harold, 1873 accepted as Ibidiomorphum Gemminger & Harold, 1873 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Coleoptera (awaiting allocation) (Family)

Ibidion
     Ibidion Gory, 1833 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Cerambycidae (Family)
     Ibidion Audinet-Serville, 1834 accepted as Neoibidion Monné, 2012 (junior homonym)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Cerambycidae (Family)

Ibidium
 Ibidium R.A. Salisbury ex J.K. Small, 1913 accepted as Spiranthes L.C. Richard, 1817 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Asparagales (Order) > Orchidaceae (Family)
 Ibidium Dejean, 1830 accepted as Ibidion Gory, 1833 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Cerambycidae (Family)

Ibis
 Ibis Temminck, 1815 accepted as Plegadis Kaup, 1829 · Animalia (Kingdom) > Chordata (Phylum) > Aves (Class) > Ciconiiformes (Order) > Threskiornithidae (Family)
 Ibis Lacepède, 1799 accepted as Mycteria Linnaeus, 1758 · Animalia (Kingdom) > Chordata (Phylum) > Aves (Class) > Ciconiiformes (Order) > Ciconiidae (Family)
 Ibis Möhring, 1758 accepted as Mycteria Linnaeus, 1758 · Animalia (Kingdom) > Chordata (Phylum) > Aves (Class) > Ciconiiformes (Order) > Ciconiidae (Family)

Icaria
 Icaria Macbride, 1929 accepted as Miconia Ruiz & Pavon, 1794 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Myrtales (Order) > Melastomataceae (Family)
 Icaria Thomson, 1878 accepted as Icarina Alluaud, 1896 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Buprestidae (Family)
     Icaria Saunders, 1871 accepted as Icarina Alluaud, 1896 (nomen nudum)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Buprestidae (Family)
     Icaria de Saussure, 1853 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Vespidae (Family)
     Icaria Schiner, 1868 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Tephritidae (Family)

Icarus
 Icarus Forbes, 1844 accepted as Oxynoe Rafinesque, 1814 · Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Sacoglossa (Order) > Oxynoidae (Family)
     Icarus Röber, 1898 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Lepidoptera (awaiting allocation) (Family)
     Icarus (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Arachnida (Class) > Actinedida (Order) > Pionidae (Family)
     Icarus A.L. de Gasper & A. Salino in A.L. de Gasper, V.A. de O. Dittrich, A.R. Smith & A. Salino, 2016 · Plantae (Kingdom) > Tracheophyta (Phylum) > Polypodiopsida (Class) > Polypodiales (Order) > Blechnaceae (Family)

Icasma
     Icasma Turner, 1902 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Noctuidae (Family)
     Icasma Collin, 1928 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Empididae (Family)

Icelus
     Icelus Koch, 1846 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Arachnida (Class) > Araneae (Order) > Salticidae (Family)
     Icelus Krøyer, 1845 · Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Scorpaeniformes (Order) > Cottidae (Family)

Icharia
 Icharia accepted as Icaria de Saussure, 1853 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Vespidae (Family)
 Icharia Rothschild, 1911 accepted as Ichoria Butler, 1876 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Erebidae (Family)

Ichneugale
     Ichneugale Jourdan, 1852 accepted as Ichneugale Jourdan, 1852 (nomen nudum)· Animalia (Kingdom) > Chordata (Phylum) > Mammalia (Class) > Mammalia (awaiting allocation) (Order) > Mammalia (awaiting allocation) (Family)
     Ichneugale Filhol, 1883 (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Mammalia (Class) > Mammalia (awaiting allocation) (Order) > Mammalia (awaiting allocation) (Family)

Ichneumon
     Ichneumon Linnaeus, 1758 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Ichneumonidae (Family)
 Ichneumon Frisch, 1775 accepted as Herpestes Illiger, 1811 · Animalia (Kingdom) > Chordata (Phylum) > Mammalia (Class) > Carnivora (Order) > Herpestidae (Family)
 Ichneumon Lacepède, 1799 accepted as Ichneumon Lacepède, 1799 · Animalia (Kingdom) > Chordata (Phylum) > Mammalia (Class) > Mammalia (awaiting allocation) (Order) > Mammalia (awaiting allocation) (Family)

Ichnium
     Ichnium Sollas, 1900 † (uncertain)· Animalia (Kingdom) > Animalia (awaiting allocation) (Phylum) > Animalia (awaiting allocation) (Class) > Animalia (awaiting allocation) (Order) > Animalia (awaiting allocation) (Family)
     Ichnium Pabst, 1896 † (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Amphibia (Class) > Amphibia (awaiting allocation) (Order) > Amphibia (awaiting allocation) (Family)

Ichnusa
     Ichnusa Reuss, 1939 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Nymphalidae (Family)
     Ichnusa Debrenne & Naud, 1981 † (uncertain)· Animalia (Kingdom) > Cnidaria (Phylum) > Cnidaria (awaiting allocation) (Class) > Cnidaria (awaiting allocation) (Order) > Cnidaria (awaiting allocation) (Family)
 Ichnusa Jeffreys, 1847 accepted as Bela Leach, 1847 · Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Neogastropoda (Order) > Mangeliidae (Family)

Ichnusella
 Ichnusella Cottarelli, 1971 accepted as Bereraia Huys, 2009 · Animalia (Kingdom) > Arthropoda (Phylum) > Maxillopoda (Class) > Harpacticoida (Order) > Leptopontiidae (Family)
 Ichnusella Dieni & Massari, 1966 † accepted as Trocholina Paalzow, 1922 † · Chromista (Kingdom) > Retaria (Phylum) > Tubothalamea (Class) > Involutinida (Order) > Involutinidae (Family)

Ichthidion
 Ichthidion Haldeman, 1843 accepted as Ichthydion Haldeman, 1843 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Anthicidae (Family)
 Ichthidion Bolivar, 1884 accepted as Ichthyotettix Rehn, 1901 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Orthoptera (Order) > Pyrgomorphidae (Family)

Ichthyaetus
     Ichthyaetus Sweeting in Wood, 1837 (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Aves (Class) > Aves (awaiting allocation) (Order) > Aves (awaiting allocation) (Family)
     Ichthyaetus Kaup, 1829 † (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Aves (Class) > Longipterygiformes (Order) > Longipterygiformes (awaiting allocation) (Family)
     Ichthyaetus Agassiz, 1846 (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Pisces (awaiting allocation) (Class) > Pisces (awaiting allocation) (Order) > Pisces (awaiting allocation) (Family)

Ichthyaëtus
 Ichthyaëtus Sweeting in Wood, 1837 accepted as Ichthyaetus Sweeting in Wood, 1837 · Animalia (Kingdom) > Chordata (Phylum) > Aves (Class) > Aves (awaiting allocation) (Order) > Aves (awaiting allocation) (Family)
 Ichthyaëtus Agassiz, 1846 accepted as Ichthyaetus Agassiz, 1846 · Animalia (Kingdom) > Chordata (Phylum) > Pisces (awaiting allocation) (Class) > Pisces (awaiting allocation) (Order) > Pisces (awaiting allocation) (Family)

Ichthydion
 Ichthydion Saussure, 1859 accepted as Ichthyotettix Rehn, 1901 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Orthoptera (Order) > Pyrgomorphidae (Family)
     Ichthydion Dejean, 1834 accepted as Ichthydion Haldeman, 1843 (nomen nudum)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Anthicidae (Family)
 Ichthydion Haldeman, 1843 accepted as Retocomus Casey, 1895 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Anthicidae (Family)

Ichthydium
 Ichthydium Agassiz, 1846 accepted as Ichthydion Haldeman, 1843 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Anthicidae (Family)
     Ichthydium Ehrenberg, 1831 (uncertain)· Protozoa (Kingdom) > (Phylum) > Protozoa (awaiting allocation) (Class) > (Order) > (Family)
     Ichthydium Ehrenberg, 1830 · Animalia (Kingdom) > Gastrotricha (Phylum) > (Class) > Chaetonotida (Order) > Chaetonotidae (Family)

Ichthyoborus
     Ichthyoborus Kaup, 1842 (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Aves (Class) > Aves (awaiting allocation) (Order) > Aves (awaiting allocation) (Family)
 Ichthyoborus Boulenger, 1907 accepted as Ichthyborus Günther, 1864 · Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Characiformes (Order) > Distichodontidae (Family)

Ichthyocolla
     Ichthyocolla Geoffroy, 1767 (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Pisces (awaiting allocation) (Class) > Pisces (awaiting allocation) (Order) > Pisces (awaiting allocation) (Family)
 Ichthyocolla Agassiz, 1846 accepted as Ichthyocolla Agassiz, 1846 · Animalia (Kingdom) > Chordata (Phylum) > Pisces (awaiting allocation) (Class) > Pisces (awaiting allocation) (Order) > Pisces (awaiting allocation) (Family)
 Ichthyocolla Garsault, 1764 accepted as Acipenser Linnaeus, 1758 · Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Acipenseriformes (Order) > Acipenseridae (Family)

Ichthyodes
     Ichthyodes Adelung, 1900 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Ephemeroptera (Order) > Ephemeridae (Family)
     Ichthyodes Newman, 1842 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Cerambycidae (Family)

Ichthyohesione
     Ichthyohesione Uchida in Uchida et al., 2019 · Animalia (Kingdom) > Annelida (Phylum) > Polychaeta (Class) > Phyllodocida (Order) > Hesionidae (Family)
     Ichthyohesione Uchida, 2004 accepted as Ichthyohesione Uchida in Uchida et al., 2019 (unavailable name)· Animalia (Kingdom) > Annelida (Phylum) > Polychaeta (Class) > Phyllodocida (Order) > Hesionidae (Family)

Ichthyolithus
     Ichthyolithus Germar in Keferstein, 1826 (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Pisces (awaiting allocation) (Class) > Pisces (awaiting allocation) (Order) > Pisces (awaiting allocation) (Family)
 Ichthyolithus Linnaeus, 1768 accepted as Ichthyolithus Linnaeus, 1768 · Animalia (Kingdom) > Chordata (Phylum) > Pisces (awaiting allocation) (Class) > Pisces (awaiting allocation) (Order) > Pisces (awaiting allocation) (Family)

Ichthyophaga
 Ichthyophaga Syromjatnikova, 1949 accepted as Piscinquilinus Sluys & Kawakatsu, 2005 · Animalia (Kingdom) > Platyhelminthes (Phylum) > Turbellaria (Class) > Prolecithophora (Order) > Genostomatidae (Family)
     Ichthyophaga Lesson, 1843 · Animalia (Kingdom) > Chordata (Phylum) > Aves (Class) > Accipitriformes (Order) > Accipitridae (Family)
 Ichthyophaga Baker, 1927 accepted as Ichthyophaga Lesson, 1843 · Animalia (Kingdom) > Chordata (Phylum) > Aves (Class) > Accipitriformes (Order) > Accipitridae (Family)

Ichthyophis
 Ichthyophis Lesson, 1828 accepted as Scuticaria Jordan & Snyder, 1901 · Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Anguilliformes (Order) > Muraenidae (Family)
     Ichthyophis Fitzinger, 1826 · Animalia (Kingdom) > Chordata (Phylum) > Amphibia (Class) > Gymnophiona (Order) > Ichthyophiidae (Family)

Ichthyopisthen
     Ichthyopisthen Aurivillius, 1891 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Dryophthoridae (Family)
     Ichthyopisthen Roelofs, 1892 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Dryophthoridae (Family)

Ichthyosoma
 Ichthyosoma Montrouzier, 1855 accepted as Thesisternus · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Cerambycidae (Family)
 Ichthyosoma Felder, 1874 accepted as Trichomaplata Wing, 1850 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Notodontidae (Family)

Ichthyoxenus
 Ichthyoxenus auctt. accepted as Ichthyoxenos Herklots, 1870 · Animalia (Kingdom) > Arthropoda (Phylum) > Malacostraca (Class) > Isopoda (Order) > Cymothoidae (Family)
 Ichthyoxenus Zimmer in Krumbach & Kükenthal, 1927 accepted as Ichthyoxenus auctt. · Animalia (Kingdom) > Arthropoda (Phylum) > Malacostraca (Class) > Isopoda (Order) > Cymothoidae (Family)

Iconella
     Iconella A. Jurilj, 1948 · Chromista (Kingdom) > Bacillariophyta (Phylum) > (Class) > Bacillariophyta (awaiting allocation) (Order) > (Family)
     Iconella Mason, 1981 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Braconidae (Family)

Ictalurus
     Ictalurus Rafinesque, 1820 · Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Siluriformes (Order) > Ictaluridae (Family)
 Ictalurus accepted as Felis Linnaeus, 1758 · Animalia (Kingdom) > Chordata (Phylum) > Mammalia (Class) > Carnivora (Order) > Felidae (Family)

Icterodes
     Icterodes Hampson, 1895 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Lepidoptera (awaiting allocation) (Family)
     Icterodes Butler, 1878 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Lepidoptera (awaiting allocation) (Family)

Icterus
 Icterus Griffith in Cuvier, 1827 accepted as Arctictis Temminck, 1824 · Animalia (Kingdom) > Chordata (Phylum) > Mammalia (Class) > Carnivora (Order) > Viverridae (Family)
     Icterus Brisson, 1760 · Animalia (Kingdom) > Chordata (Phylum) > Aves (Class) > Passeriformes (Order) > Fringillidae (Family)

Ictidopsis
     Ictidopsis Broom, 1912 † (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Reptilia (Class) > Reptilia (awaiting allocation) (Order) > Reptilia (awaiting allocation) (Family)
     Ictidopsis Van Hoepen, 1916 (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Reptilia (Class) > Reptilia (awaiting allocation) (Order) > Reptilia (awaiting allocation) (Family)

Ictinaetus
     Ictinaetus Agassiz, 1846 (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Aves (Class) > Aves (awaiting allocation) (Order) > Aves (awaiting allocation) (Family)
     Ictinaetus Blyth, 1843 · Animalia (Kingdom) > Chordata (Phylum) > Aves (Class) > Accipitriformes (Order) > Accipitridae (Family)

Ictinocephalus
     Ictinocephalus Powrie, 1864 † (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Pisces (awaiting allocation) (Class) > Pisces (awaiting allocation) (Order) > Pisces (awaiting allocation) (Family)
     Ictinocephalus Page, 1859 † accepted as Ictinocephalus Page, 1859 † (nomen nudum)· Animalia (Kingdom) > Chordata (Phylum) > Pisces (awaiting allocation) (Class) > Pisces (awaiting allocation) (Order) > Pisces (awaiting allocation) (Family)

Ictinus
     Ictinus Morris in Wood, 1837 (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Aves (Class) > Aves (awaiting allocation) (Order) > Aves (awaiting allocation) (Family)
     Ictinus Cassini, 1818 (uncertain)· Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Asterales (Order) > Asteraceae (Family)
 Ictinus Rambur, 1842 accepted as Ictinogomphus Cowley, 1934 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Odonata (Order) > Gomphidae (Family)
 Ictinus Laporte, 1834 accepted as Ozaena Olivier, 1812 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Carabidae (Family)

Ictis
 Ictis Kaup, 1829 accepted as Mustela Linnaeus, 1758 · Animalia (Kingdom) > Chordata (Phylum) > Mammalia (Class) > Carnivora (Order) > Mustelidae (Family)
 Ictis Candèze, 1863 accepted as Pleonomus Ménétriés, 1848 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Elateridae (Family)
     Ictis Alder & Hancock, 1847 (uncertain)· Animalia (Kingdom) > Mollusca (Phylum) > Mollusca (awaiting allocation) (Class) > Mollusca (awaiting allocation) (Order) > Mollusca (awaiting allocation) (Family)
     Ictis Schinz, 1827 (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Mammalia (Class) > Carnivora (Order) > Viverridae (Family)
     Ictis Schulze, 1897 (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Mammalia (Class) > Carnivora (Order) > Mustelidae (Family)
 Ictis Berthold in Latreille, 1827 accepted as Arctictis Temminck, 1824 · Animalia (Kingdom) > Chordata (Phylum) > Mammalia (Class) > Carnivora (Order) > Viverridae (Family)

Ida
     Ida Jay, 1836 accepted as Ida Jay, 1836 (nomen nudum)· Animalia (Kingdom) > Mollusca (Phylum) > Mollusca (awaiting allocation) (Class) > Mollusca (awaiting allocation) (Order) > Mollusca (awaiting allocation) (Family)
     Ida Gray, 1838 (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Reptilia (Class) > Squamata (Order) > Lacertilia (awaiting allocation) (Family)
     Ida Gray, 1873 (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Reptilia (Class) > Testudines (Order) > Testudines (awaiting allocation) (Family)
     Ida Robineau-Desvoidy, 1863 accepted as Dexia Meigen, 1826 (junior homonym)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Tachinidae (Family)

Idacantha
 Idacantha Chapuis, 1875 accepted as Prosmidia Weise, 1902 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Chrysomelidae (Family)
 Idacantha Fairmaire, 1869 accepted as Diacantha Chevrolat in Dejean, 1836 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Chrysomelidae (Family)

Idaea
 Idaea Oberthür, 1880 accepted as Idea Fabricius, 1807 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Nymphalidae (Family)
     Idaea Treitschke, 1825 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Geometridae (Family)

Idaethina
 Idaethina Reitter, 1875 accepted as Australaethina Kirejtshuk & Lawrence, 1999 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Nitidulidae (Family)
     Idaethina Gemminger & Harold, 1868 accepted as Idaethina Gemminger & Harold, 1868 (nomen nudum)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Nitidulidae (Family)

Idalia
 Idalia Gray, 1847 accepted as Doto Oken, 1815 · Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Nudibranchia (Order) > Dotidae (Family)
     Idalia Hübner, 1825 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Geometridae (Family)
     Idalia Rafinesque, 1838 (uncertain)· Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Solanales (Order) > Convolvulaceae (Family)
     Idalia Hübner, 1819 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Erebidae (Family)
 Idalia Mulsant, 1846 accepted as Adalia Mulsant, 1846 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Coccinellidae (Family)
 Idalia Leuckart, 1828 accepted as Okenia Menke, 1830 · Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Nudibranchia (Order) > Goniodorididae (Family)
 Idalia Quatrefages, 1866 accepted as Pista Malmgren, 1866 · Animalia (Kingdom) > Annelida (Phylum) > Polychaeta (Class) > Terebellida (Order) > Terebellidae (Family)

Idalina
     Idalina Schlumberger & Munier-Chalmas, 1884 † · Chromista (Kingdom) > Retaria (Phylum) > Tubothalamea (Class) > Miliolida (Order) > Hauerinidae (Family)
 Idalina Norman, 1890 accepted as Okenia Menke, 1830 · Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Nudibranchia (Order) > Goniodorididae (Family)

Idas
     Idas Mulsant, 1876 accepted as Idas Mulsant, 1876 (nomen nudum)· Animalia (Kingdom) > Chordata (Phylum) > Aves (Class) > Aves (awaiting allocation) (Order) > Aves (awaiting allocation) (Family)
     Idas Jeffreys, 1876 · Animalia (Kingdom) > Mollusca (Phylum) > Bivalvia (Class) > Mytiloida (Order) > Mytilidae (Family)

Idatius
 Idatius Distant, 1910 accepted as Sejanus Distant, 1910 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Miridae (Family)
     Idatius Fairmaire, 1906 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Tenebrionidae (Family)

Iddingsia
     Iddingsia Olsson, 1929 † · Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Sorbeoconcha (Order) > Cerithiidae (Family)
     Iddingsia Walcott, 1924 † · Animalia (Kingdom) > Arthropoda (Phylum) > Trilobita (Class) > Ptychopariida (Order) > Dokimocephalidae (Family)

Idechthis
     Idechthis Hübner, 1821 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Lepidoptera (awaiting allocation) (Family)
     Idechthis Förster, 1868 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Hymenoptera (awaiting allocation) (Family)

Idesia
 Idesia Scopoli, 1777 accepted as Diospyros Linnaeus, 1753 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Ericales (Order) > Ebenaceae (Family)
     Idesia Maximowicz, 1866 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Malpighiales (Order) > Salicaceae (Family)

Idia
 Idia Hübner, 1809-1813 accepted as Idia Hübner, 1809-1813 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Lepidoptera (awaiting allocation) (Family)
 Idia Fieber, 1866 accepted as Idia Fieber, 1866 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Cicadellidae (Family)
 Idia Lamouroux, 1816 accepted as Idiellana Cotton & Godfrey, 1942 · Animalia (Kingdom) > Cnidaria (Phylum) > Hydrozoa (Class) > Leptothecata (Order) > Sertulariidae (Family)
     Idia Wiedemann, 1820 accepted as Stomorhina Rondani, 1861 (junior homonym)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Calliphoridae (Family)

Idiacanthus
     Idiacanthus Peters, 1877 · Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Stomiiformes (Order) > Stomiidae (Family)
     Idiacanthus Gunnell, 1933 † (uncertain)· Animalia (Kingdom) > Mollusca (Phylum) > Mollusca (awaiting allocation) (Class) > Mollusca (awaiting allocation) (Order) > Mollusca (awaiting allocation) (Family)

Idiella
 Idiella Stechow, 1919 accepted as Idiellana Cotton & Godfrey, 1942 · Animalia (Kingdom) > Cnidaria (Phylum) > Hydrozoa (Class) > Leptothecata (Order) > Sertulariidae (Family)
     Idiella Brauer & Bergenstamm, 1890 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Rhiniidae (Family)

Idiocerus
     Idiocerus Lewis, 1834 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Cicadellidae (Family)
     Idiocerus Curtis, 1839 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Diptera (awaiting allocation) (Family)

Idiocheila
 Idiocheila accepted as Vexillum Röding, 1798 · Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Neogastropoda (Order) > Costellariidae (Family)
 Idiocheila Frivaldsky, 1883 accepted as Apatetica Westwood, 1848 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Staphylinidae (Family)

Idiochila
 Idiochila Bernhauer & Schubert, 1910 accepted as Apatetica Westwood, 1848 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Agyrtidae (Family)
 Idiochila Pilsbry, 1921 accepted as Vexillum Röding, 1798 · Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Neogastropoda (Order) > Costellariidae (Family)

Idiochlora
 Idiochlora Prout, 1912 accepted as Dryochlora Fletcher, 1979 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Geometridae (Family)
     Idiochlora Warren, 1896 accepted as Dryochlora Fletcher, 1979 (nomen nudum)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Geometridae (Family)

Idiochroa
     Idiochroa Turner, 1922 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Geometridae (Family)
 Idiochroa Turner, 1947 accepted as Idioxantha Common, 1994 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Oecophoridae (Family)

Idiodamaeus
 Idiodamaeus Paschoal, 1984 accepted as Austrodamaeus Balogh & Mahunka, 1981 · Animalia (Kingdom) > Arthropoda (Phylum) > Arachnida (Class) > Oribatida (Order) > Idiodamaeidae (Family)
 Idiodamaeus Paschoal in Paschoal & Johnston, 1982 accepted as Austrodamaeus Balogh & Mahunka, 1981 · Animalia (Kingdom) > Arthropoda (Phylum) > Arachnida (Class) > Oribatida (Order) > Idiodamaeidae (Family)

Idiolorryia
     Idiolorryia André, 1980 · Animalia (Kingdom) > Arthropoda (Phylum) > Arachnida (Class) > Actinedida (Order) > Tydeidae (Family)
     Idiolorryia André, 1979 accepted as Idiolorryia André, 1980 (nomen nudum)· Animalia (Kingdom) > Arthropoda (Phylum) > Arachnida (Class) > Actinedida (Order) > Tydeidae (Family)

Idiomerus
     Idiomerus Melzer, 1934 accepted as Melzerus Monné, 2005 (junior homonym)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Cerambycidae (Family)
 Idiomerus Dolin in Dolin & Pritykina, 1980 † accepted as Necromera Martynov, 1926 † · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Cerophytidae (Family)
     Idiomerus Imms, 1912 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Collembola (Class) > (Order) > Collembola (awaiting allocation) (Family)

Idiomorpha
     Idiomorpha Förster, 1869 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Hymenoptera (awaiting allocation) (Family)
 Idiomorpha Croneis & Gale, 1939 † accepted as Idiomorphina Croneis & Gale, 1939 † · Animalia (Kingdom) > Arthropoda (Phylum) > Ostracoda (Class) > Ostracoda (awaiting allocation) (Order) > Ostracoda incertae sedis (Family)
 Idiomorpha Turner, 1946 accepted as Bakia Koçak, 1981 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Tortricidae (Family)

Idiomorphus
     Idiomorphus Chaudoir, 1846 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Carabidae (Family)
 Idiomorphus Doumet, 1861 accepted as Bicyclus Kirby, 1871 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Nymphalidae (Family)
 Idiomorphus Dolin in Dolin & Pritykina, 1980 † accepted as Dolinelater Huber, Marggi & Menkveld-Gfeller, 2017 † · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Elateridae (Family)

Idioneura
     Idioneura Selys, 1860 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Odonata (Order) > Protoneuridae (Family)
 Idioneura Felder, 1867 accepted as Idioneurula Strand, 1932 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Nymphalidae (Family)
     Idioneura Philippi, 1865 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Diptera (awaiting allocation) (Family)

Idiophyllum
     Idiophyllum Lesquereux, 1880 † (uncertain)· Plantae (Kingdom) > Plantae (awaiting allocation) (Phylum) > Plantae (awaiting allocation) (Class) > Plantae (awaiting allocation) (Order) > Plantae (awaiting allocation) (Family)
     Idiophyllum Cao, 1975 † · Animalia (Kingdom) > Cnidaria (Phylum) > (Class) > Rugosa (Order) > Rugosa (awaiting allocation) (Family)

Idiopsis
 Idiopsis Faust, 1897 accepted as Idiopsodes Thompson, 1977 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Curculionidae (Family)
     Idiopsis Brauer & Bergenstamm, 1890 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Rhiniidae (Family)
     Idiopsis Kaszab, 1981 accepted as Kocakia Kaszab, 1985 (junior homonym)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Tenebrionidae (Family)

Idiostolus
 Idiostolus Ashmead, 1900 accepted as Idiostolus Ashmead, 1900 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Hymenoptera (awaiting allocation) (Family)
     Idiostolus Berg, 1883 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Lygaeidae (Family)

Idiostoma
     Idiostoma Walsingham, 1882 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Lepidoptera (awaiting allocation) (Family)
     Idiostoma Cameron, 1905 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Hymenoptera (awaiting allocation) (Family)
 Idiostoma Arrow, 1904 accepted as Allidiostoma Arrow, 1940 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Hybosoridae (Family)

Idiostyla
     Idiostyla Meyrick, 1921 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Cosmopterigidae (Family)
     Idiostyla Drake, 1946 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Tingidae (Family)

Idiotropus
     Idiotropus Fieber, 1860 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Microphysidae (Family)
     Idiotropus Berg, 1883 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Lygaeidae (Family)

Idiotubus
     Idiotubus Kozlowski, 1938 † accepted as Idiotubus Kozlowski, 1938 † (nomen nudum)· Animalia (Kingdom) > Cnidaria (Phylum) > Cnidaria (awaiting allocation) (Class) > Cnidaria (awaiting allocation) (Order) > Cnidaria (awaiting allocation) (Family)
     Idiotubus Kozlowski, 1948 † · Animalia (Kingdom) > Hemichordata (Phylum) > Graptolithina (Class) > Tuboidea (Order) > Tuboidea (awaiting allocation) (Family)

Idiotypa
     Idiotypa Förster, 1856 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Hymenoptera (awaiting allocation) (Family)
     Idiotypa Loew, 1873 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Richardiidae (Family)

Idiozancla
     Idiozancla Turner, 1936 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Oecophoridae (Family)
 Idiozancla Turner, 1939 accepted as Phobetica Turner, 1944 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Gelechiidae (Family)

Idolocoris
     Idolocoris Douglas & Scott, 1865 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Hemiptera (awaiting allocation) (Family)
 Idolocoris Walker in Richter, 1872 accepted as Haematomyzus Piaget, 1869 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Phthiraptera (Order) > Haematomyzidae (Family)

Idolum
 Idolum Saussure, 1869 accepted as Idolomantis Uvarov, 1940 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Mantodea (Order) > Empusidae (Family)
     Idolum Pfeiffer, 1856 (uncertain)· Animalia (Kingdom) > Mollusca (Phylum) > Mollusca (awaiting allocation) (Class) > Mollusca (awaiting allocation) (Order) > Mollusca (awaiting allocation) (Family)

Idotaea
 Idotaea Dana, 1849 accepted as Idotea Fabricius, 1798 · Animalia (Kingdom) > Arthropoda (Phylum) > Malacostraca (Class) > Isopoda (Order) > Idoteidae (Family)
 Idotaea Fabricius, 1796 accepted as Idotea Fabricius, 1798 · Animalia (Kingdom) > Arthropoda (Phylum) > Malacostraca (Class) > Isopoda (Order) > Idoteidae (Family)

Idotea
     Idotea Fabricius, 1798 · Animalia (Kingdom) > Arthropoda (Phylum) > Malacostraca (Class) > Isopoda (Order) > Idoteidae (Family)
     Idotea Weber, 1795 accepted as (nomen nudum)· Animalia (Kingdom) > Arthropoda (Phylum) > Malacostraca (Class) > Decapoda (Order) > Hippidae (Family)
 Idotea Paetel, 1875 accepted as Idotea Paetel, 1875 · Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Cephalaspidea (Order) > Aglajidae (Family)

Idothea
     Idothea Kunth, 1843 (uncertain)· Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Liliales (Order) > Liliaceae (Family)
 Idothea Fabricius, 1796 accepted as Idotea Fabricius, 1798 · Animalia (Kingdom) > Arthropoda (Phylum) > Malacostraca (Class) > Isopoda (Order) > Idoteidae (Family)
 Idothea Schumacher, 1817 accepted as Fimbria Megerle von Mühlfeld, 1811 · Animalia (Kingdom) > Mollusca (Phylum) > Bivalvia (Class) > Venerida (Order) > Lucinidae (Family)
 Idothea Agassiz, 1846 [2] † accepted as Campylocephalus Eichwald, 1860 † · Animalia (Kingdom) > Arthropoda (Phylum) > (Class) > Eurypterida (Order) > Stylonuridae (Family)
 Idothea Agassiz, 1846 accepted as Idothea Agassiz, 1846 · Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Cephalaspidea (Order) > Aglajidae (Family)

Iduna
     Iduna Keyserling & Blasius, 1840 (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Aves (Class) > Passeriformes (Order) > Sylviidae (Family)
     Iduna Claparède & Lachmann, 1860 (uncertain)· Protozoa (Kingdom) > (Phylum) > Protozoa (awaiting allocation) (Class) > (Order) > (Family)
 Iduna Boeck, 1861 accepted as Liljeborgia Spence Bate, 1862 · Animalia (Kingdom) > Arthropoda (Phylum) > Malacostraca (Class) > Amphipoda (Order) > Liljeborgiidae (Family)

Idus
 Idus Heckel in Russegger, 1843 accepted as Leuciscus Cuvier, 1816 · Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Cypriniformes (Order) > Cyprinidae (Family)
 Idus Broun, 1893 accepted as Reyesiella Alonso-Zarazaga & Lyal, 1999 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Curculionidae (Family)

Idya
 Idya Fréminville, 1809 accepted as Beroe Gronov, 1760 · Animalia (Kingdom) > Ctenophora (Phylum) > Nuda (Class) > Beroida (Order) > Beroidae (Family)
 Idya Philippi, 1843 accepted as Tisbe Lilljeborg, 1853 · Animalia (Kingdom) > Arthropoda (Phylum) > Maxillopoda (Class) > Harpacticoida (Order) > Tisbidae (Family)

Idyellopsis
     Idyellopsis Lang, 1944 accepted as Idyellopsis Lang, 1948 (nomen nudum)· Animalia (Kingdom) > Arthropoda (Phylum) > Maxillopoda (Class) > Harpacticoida (Order) > Idyanthidae (Family)
     Idyellopsis Lang, 1948 · Animalia (Kingdom) > Arthropoda (Phylum) > Maxillopoda (Class) > Harpacticoida (Order) > Idyanthidae (Family)

Idyia
     Idyia Rafinesque, 1814 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Crustacea (awaiting allocation) (Class) > Crustacea (awaiting allocation) (Order) > Crustacea (awaiting allocation) (Family)
     Idyia Linnavuori, 1960 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Cicadellidae (Family)
     Idyia (uncertain)· Animalia (Kingdom) > Ctenophora (Phylum) > Nuda (Class) > Beroida (Order) > Beroidae (Family)
 Idyia Agassiz, 1846 accepted as Idyia Agassiz, 1846 · Animalia (Kingdom) > Arthropoda (Phylum) > Maxillopoda (Class) > Harpacticoida (Order) > Tisbidae (Family)

Idyla
     Idyla Adams, 1855 · Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Stylommatophora (Order) > Clausiliidae (Family)
     Idyla Vest, 1867 (uncertain)· Animalia (Kingdom) > Mollusca (Phylum) > Mollusca (awaiting allocation) (Class) > Mollusca (awaiting allocation) (Order) > Mollusca (awaiting allocation) (Family)

Idyopsis
 Idyopsis Agassiz, 1860 accepted as Beroe Gronov, 1760 · Animalia (Kingdom) > Ctenophora (Phylum) > Nuda (Class) > Beroida (Order) > Beroidae (Family)
 Idyopsis G.O. Sars, 1905 accepted as Idyanthe G.O. Sars, 1909 · Animalia (Kingdom) > Arthropoda (Phylum) > Maxillopoda (Class) > Harpacticoida (Order) > Idyanthidae (Family)

Ierax
     Ierax Leach, 1816 accepted as Ierax Leach, 1816 (nomen nudum)· Animalia (Kingdom) > Chordata (Phylum) > Aves (Class) > Accipitriformes (Order) > Falconidae (Family)
     Ierax Forster, 1817 (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Aves (Class) > Accipitriformes (Order) > Falconidae (Family)

Ifasina
     Ifasina Jeannel, 1946 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Coleoptera (awaiting allocation) (Family)
 Ifasina Rivalier, 1961 accepted as Cylindera Westwood, 1831 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Cicindelidae (Family)

Iforasia
     Iforasia Fischer, 1963 † (uncertain)· Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Gastropoda (awaiting allocation) (Order) > Gastropoda (awaiting allocation) (Family)
     Iforasia Fischer, 1962 † accepted as Iforasia Fischer, 1962 † (nomen nudum)· Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Gastropoda (awaiting allocation) (Order) > Gastropoda (awaiting allocation) (Family)

Ifrania
     Ifrania Leraut, 2009 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Geometridae (Family)
     Ifrania Glöer, Mabrouki & Taybi, 2020 accepted as Ifrania Glöer, Mabrouki & Taybi, 2020 (junior homonym)· Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Littorinimorpha (Order) > Hydrobiidae (Family)

Ignambia
     Ignambia Heller in Sarasin & Roux, 1916 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Scarabaeidae (Family)
     Ignambia Cheesman, 1953 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Hymenoptera (awaiting allocation) (Family)

Iguana
     Iguana Laurenti, 1768 · Animalia (Kingdom) > Chordata (Phylum) > Reptilia (Class) > Squamata (Order) > Iguanidae (Family)
 Iguana Gronovius, 1763 accepted as Iguana Laurenti, 1768 · Animalia (Kingdom) > Chordata (Phylum) > Reptilia (Class) > Squamata (Order) > Iguanidae (Family)

Iguanosaurus
     Iguanosaurus Ritgen, 1828 † (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Reptilia (Class) > Reptilia (awaiting allocation) (Order) > Reptilia (awaiting allocation) (Family)
     Iguanosaurus Kuhn, 1944 † (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Reptilia (Class) > Squamata (Order) > Sauria (awaiting allocation) (Family)

Iheringia
 Iheringia Keyserling, 1891 accepted as Otiothops MacLeay, 1838 · Animalia (Kingdom) > Arthropoda (Phylum) > Arachnida (Class) > Araneae (Order) > Palpimanidae (Family)
 Iheringia Lahille, 1898 † accepted as Iheringiella Berg, 1898 † · Animalia (Kingdom) > Echinodermata (Phylum) > Echinoidea (Class) > Clypeasteroida (Order) > Iheringiellidae (Family)
 Iheringia Jones, 1914 accepted as Lophomyra Schaus, 1911 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Noctuidae (Family)
 Iheringia Cossmann, 1899 † accepted as Iheringia Cossmann, 1899 † · Animalia (Kingdom) > Mollusca (Phylum) > Bivalvia (Class) > Venerida (Order) > Lahilliidae (Family)

Ihlea
     Ihlea Metcalf, 1919 · Animalia (Kingdom) > Chordata (Phylum) > Thaliacea (Class) > Salpida (Order) > Salpidae (Family)
 Ihlea Travassos & Vogelsang, 1932 accepted as Oesophagostomum Molin, 1861 · Animalia (Kingdom) > Nematoda (Phylum) > Chromadorea (Class) > Rhabditida (Order) > Chabertiidae (Family)
     Ihlea Metcalf, 1918 (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Thaliacea (Class) > Salpida (Order) > Salpidae (Family)

Ijimaia
     Ijimaia Gordon & d'Hondt, 1997 (uncertain)· Animalia (Kingdom) > Bryozoa (Phylum) > Bryozoa (awaiting allocation) (Class) > Bryozoa (awaiting allocation) (Order) > Bryozoa (awaiting allocation) (Family)
     Ijimaia Sauter, 1905 · Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Ateleopodiformes (Order) > Ateleopodidae (Family)

Ikonnikovia
     Ikonnikovia Beï-Bienko, 1935 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Orthoptera (Order) > Acrididae (Family)
     Ikonnikovia I.A. Linczevski in B.K. Schischkin & E.G. Bobrov, 1952 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Caryophyllales (Order) > Plumbaginaceae (Family)

Ikrandraco
     Ikrandraco Wang, Rodrigues, Jiang, Cheng & Kellner, 2020 † · Animalia (Kingdom) > Chordata (Phylum) > Reptilia (Class) > Pterosauria (Order) > Pteranodontoidea incertae sedis (Family)
     Ikrandraco Wang, Rodrigues, Jiang, Cheng & Kellner, 2014 † accepted as Ikrandraco Wang, Rodrigues, Jiang, Cheng & Kellner, 2020 † (unavailable name)· Animalia (Kingdom) > Chordata (Phylum) > Reptilia (Class) > Pterosauria (Order) > Pteranodontoidea incertae sedis (Family)

Ilaenchus
 Ilaenchus Lučnik, 1933 accepted as Chlaenius Bonelli, 1810 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Carabidae (Family)
 Ilaenchus Basilewsky & Grundmann, 1954 accepted as Chlaenius Bonelli, 1810 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Carabidae (Family)

Ilarches
 Ilarches Cantor, 1849 accepted as Ephippus Cuvier, 1816 · Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Perciformes (Order) > Ephippidae (Family)
     Ilarches Meyrick, 1933 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Lepidoptera (awaiting allocation) (Family)

Ilea
 Ilea E.M. Fries, 1825 accepted as · Plantae (Kingdom) > Chlorophyta (Phylum) > Ulvophyceae (Class) > Ulvales (Order) > Ulvaceae (Family)
 Ilea J.G. Agardh, 1883 accepted as Capsosiphon Gobi, 1879 · Plantae (Kingdom) > Chlorophyta (Phylum) > Ulvophyceae (Class) > Ulotrichales (Order) > Ulotrichaceae (Family)
 Ilea E.M. Fries, 1835 accepted as Petalonia Derbès & Solier, 1850 · Chromista (Kingdom) > Ochrophyta (Phylum) > Phaeophyceae (Class) > Ectocarpales (Order) > Scytosiphonaceae (Family)

Ilema
     Ilema Moore, 1858 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Erebidae (Family)
 Ilema Hampson, 1900 accepted as Ilema Hampson, 1900 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Erebidae (Family)

Ilerda
     Ilerda Doubleday, 1847 accepted as Heliophorus Geyer in Hübner, 1832 (junior subjective synonym)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Lycaenidae (Family)
     Ilerda Stål, 1864 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Tropiduchidae (Family)

Ilerdaesaurus
     Ilerdaesaurus Hoffstetter, 1966 † (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Reptilia (Class) > Squamata (Order) > Sauria (awaiting allocation) (Family)
     Ilerdaesaurus Hoffstetter, 1965 † (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Reptilia (Class) > Squamata (Order) > Sauria (awaiting allocation) (Family)

Iletica
 Iletica Gemminger & Harold, 1870 accepted as Eletica Dejean, 1834 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Meloidae (Family)
 Iletica Agassiz, 1846 accepted as Eletica Dejean, 1834 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Meloidae (Family)

Ilex
 Ilex P. Miller, 1754 accepted as Quercus Linnaeus, 1753 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Fagales (Order) > Fagaceae (Family)
     Ilex Linnaeus, 1753 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Aquifoliales (Order) > Aquifoliaceae (Family)

Ilia
     Ilia Baranov, 1938 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Diptera (awaiting allocation) (Family)
     Ilia Leach, 1817 · Animalia (Kingdom) > Arthropoda (Phylum) > Malacostraca (Class) > Decapoda (Order) > Leucosiidae (Family)
 Ilia Hartman, 1881 accepted as Ilia Hartman, 1881 · Animalia (Kingdom) > Mollusca (Phylum) > Mollusca (awaiting allocation) (Class) > Mollusca (awaiting allocation) (Order) > Mollusca (awaiting allocation) (Family)

Iliella
 Iliella Rukavishnikova in Nikitin, Popov & Rukavishnikova, 1980 † accepted as Rukavischnikovia Doweld, 2015 † · Animalia (Kingdom) > Brachiopoda (Phylum) > Rhynchonellata (Class) > Spiriferida (Order) > Cyrtiidae (Family)
     Iliella Krylov, 1975 † · Bacteria (Kingdom) > Cyanobacteria (Phylum) > Cyanophyceae (Class) > Kussiellida (Order) > Kussiellidae (Family)
     Iliella Bacescu, 1968 † (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Malacostraca (Class) > Malacostraca (awaiting allocation) (Order) > Malacostraca (awaiting allocation) (Family)
     Iliella Tchernyshev, 1940 † · Animalia (Kingdom) > Arthropoda (Phylum) > Branchiopoda (Class) > Kazacharthra (Order) > Ketmeniidae (Family)

Iliolopha
     Iliolopha Bonaparte, 1854 accepted as Iliolopha Bonaparte, 1854 (nomen nudum)· Animalia (Kingdom) > Chordata (Phylum) > Aves (Class) > Aves (awaiting allocation) (Order) > Aves (awaiting allocation) (Family)
     Iliolopha Sclater, 1856 (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Aves (Class) > Aves (awaiting allocation) (Order) > Aves (awaiting allocation) (Family)

Ilione
     Ilione Haliday in Curtis, 1837 accepted as Ilione Haliday in Curtis, 1837 (nomen nudum)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Sciomyzidae (Family)
 Ilione Hendel, 1901 accepted as Ilione Haliday in Curtis, 1837 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Sciomyzidae (Family)

Ilisha
     Ilisha Richardson, 1846 · Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Clupeiformes (Order) > Pristigasteridae (Family)
     Ilisha Southwell & Prashad, 1918 (uncertain)· Animalia (Kingdom) > Platyhelminthes (Phylum) > Cestoda (Class) > Cestoda (awaiting allocation) (Order) > Cestoda (awaiting allocation) (Family)

Ilisia
 Ilisia Fitzinger, 1826 accepted as Ilisia Fitzinger, 1826 · Animalia (Kingdom) > Chordata (Phylum) > Reptilia (Class) > Squamata (Order) > Aniliidae (Family)
     Ilisia Rondani, 1856 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Limoniidae (Family)

Iliusa
 Iliusa Mulsant & Rey, 1874 accepted as Myrmecopora Saulcy, 1864 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Staphylinidae (Family)
 Iliusa Mulsant & Rey, 1873 accepted as Myrmecopora Saulcy, 1864 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Staphylinidae (Family)

Iljinia
     Iljinia Korovin ex M.M. Iljin in B.K. Schischkin, 1936 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Caryophyllales (Order) > Amaranthaceae (Family)
 Iljinia de Buen, 1930 accepted as Pomatoschistus Gill, 1863 · Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Perciformes (Order) > Gobiidae (Family)

Illa
     Illa Adanson, 1763 (uncertain)· Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Lamiales (Order) > Verbenaceae (Family)
     Illa Warren, 1914 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Geometridae (Family)
 Illa Baranov, 1938 accepted as Solomonilla Özdikmen, 2007 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Tachinidae (Family)

Illecebrum
     Illecebrum Linnaeus, 1753 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Caryophyllales (Order) > Caryophyllaceae (Family)
 Illecebrum K.P.J. Sprengel, 1817 accepted as Alternanthera Forsskål, 1775 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Caryophyllales (Order) > Amaranthaceae (Family)

Illidgea
 Illidgea Lea, 1912 accepted as Acidinus Zimmerman, 1994 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Curculionidae (Family)
     Illidgea Turner, 1897 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Xyloryctidae (Family)

Illiesiella
     Illiesiella Wagner, 1985 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Empididae (Family)
     Illiesiella Besch, 1964 · Animalia (Kingdom) > Arthropoda (Phylum) > Arachnida (Class) > Actinedida (Order) > Sperchontidae (Family)

Illigera
     Illigera Meigen, 1838 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Diptera (awaiting allocation) (Family)
     Illigera Blume, 1826 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Laurales (Order) > Hernandiaceae (Family)

Ilonara
     Ilonara J.M.H. Shaw, 2005 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Asparagales (Order) > Orchidaceae (Family)
 Ilonara W. Savage & J.M.H. Shaw, 2004 accepted as Ilonara J.M.H. Shaw, 2005 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Asparagales (Order) > Orchidaceae (Family)

Ilyanthus
     Ilyanthus Dana, 1846 · Animalia (Kingdom) > Cnidaria (Phylum) > Hexacorallia (Class) > Actiniaria (Order) > Aiptasiidae (Family)
     Ilyanthus Forbes, 1840 · Animalia (Kingdom) > Cnidaria (Phylum) > Hexacorallia (Class) > Actiniaria (Order) > Haloclavidae (Family)

Ilyobates
     Ilyobates Kraatz, 1856 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Staphylinidae (Family)
 Ilyobates Sars, 1866 accepted as Krithe Brady, Crosskey & Robertson, 1874 · Animalia (Kingdom) > Arthropoda (Phylum) > Ostracoda (Class) > Podocopida (Order) > Krithidae (Family)

Ilyobius
     Ilyobius Enderlein, 1910 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Neuroptera (Order) > Neuroptera (awaiting allocation) (Family)
 Ilyobius Gemminger & Harold, 1868 accepted as Ilybius Erichson, 1832 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Dytiscidae (Family)
 Ilyobius Agassiz, 1846 accepted as Ilybius Erichson, 1832 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Dytiscidae (Family)

Ilyodrilus
     Ilyodrilus Štolc, 1888 (uncertain)· Animalia (Kingdom) > Annelida (Phylum) > Clitellata (Class) > Oligochaeta (awaiting allocation) (Order) > Oligochaeta (awaiting allocation) (Family)
     Ilyodrilus Eisen, 1879 · Animalia (Kingdom) > Annelida (Phylum) > Clitellata (Class) > Haplotaxida (Order) > Naididae (Family)

Ilythea
     Ilythea Haliday, 1839 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Ephydridae (Family)
     Ilythea Curtis, 1837 accepted as Ilythea Haliday, 1839 (nomen nudum)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Ephydridae (Family)

Imania
     Imania V.A. Krassilov & S.A. Schorochova in E.V. Krasnov, 1970 † (uncertain)· Plantae (Kingdom) > Tracheophyta (Phylum) > Pteridospermopsida (Class) > Pteridospermopsida (awaiting allocation) (Order) > Pteridospermopsida (awaiting allocation) (Family)
     Imania Martynov, 1935 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Trichoptera (Order) > Apataniidae (Family)

Imantocera
     Imantocera Dejean, 1835 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Cerambycidae (Family)
 Imantocera Thomson, 1857 accepted as Imantocera Dejean, 1835 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Cerambycidae (Family)

Imantophyllum
     Imantophyllum W.J. Hooker, 1854 (uncertain)· Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Asparagales (Order) > Amaryllidaceae (Family)
 Imantophyllum W.J. Hooker, 1828 accepted as Imatophyllum W.J. Hooker, 1828 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Asparagales (Order) > Amaryllidaceae (Family)

Imatidium
     Imatidium Fabricius, 1801 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Chrysomelidae (Family)
 Imatidium Aslam, 1965 accepted as Aslamidium Borowiec, 1984 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Chrysomelidae (Family)

Imbricaria
 Imbricaria Commerson ex A.L. Jussieu, 1789 accepted as Mimusops Linnaeus, 1753 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Ericales (Order) > Sapotaceae (Family)
 Imbricaria (J.C.D. Schreber) A. Michaux, 1803 accepted as Anaptychia Körber, 1848 · Fungi (Kingdom) > Ascomycota (Phylum) > Lecanoromycetes (Class) > Teloschistales (Order) > Physciaceae (Family)
     Imbricaria Schumacher, 1817 · Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Neogastropoda (Order) > Mitridae (Family)
 Imbricaria J.E. Smith, 1797 accepted as Baeckea Linnaeus, 1753 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Myrtales (Order) > Myrtaceae (Family)

Imbricatospira
     Imbricatospira Fu, 1985 † (uncertain)· Animalia (Kingdom) > Brachiopoda (Phylum) > Brachiopoda (awaiting allocation) (Class) > Brachiopoda (awaiting allocation) (Order) > Brachiopoda (awaiting allocation) (Family)
     Imbricatospira Fu, 1982 † · Animalia (Kingdom) > Brachiopoda (Phylum) > Rhynchonellata (Class) > Atrypida (Order) > Atrypidae (Family)

Imbrius
     Imbrius Pascoe, 1866 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Cerambycidae (Family)
     Imbrius Stål, 1874 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Hemiptera (awaiting allocation) (Family)

Imelda
     Imelda Dellacasa, Gordon & Dellacasa, 2002 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Scarabaeidae (Family)
 Imelda Hewitson, 1870 accepted as Echenais Hübner, 1819 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Riodinidae (Family)

Imeria
     Imeria Cameron, 1903 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Ichneumonidae (Family)
     Imeria R.M. King & H.E. Robinson, 1975 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Asterales (Order) > Asteraceae (Family)

Imerina
     Imerina Ragonot, 1891 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Pyralidae (Family)
 Imerina Raffray, 1897 accepted as Merinia Newton & Chandler, 1989 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Staphylinidae (Family)
     Imerina Lehrer, 2003 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Sarcophagidae (Family)

Imhofia
 Imhofia Heister, 1755 accepted as Nerine Herbert, 1820 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Asparagales (Order) > Amaryllidaceae (Family)
 Imhofia Herbert, 1821 accepted as Hessea W. Herbert, 1837 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Asparagales (Order) > Amaryllidaceae (Family)

Imisia
 Imisia Renier, 1804 accepted as Imisia Renier, 1804 · Animalia (Kingdom) > Mollusca (Phylum) > Bivalvia (Class) > Venerida (Order) > Galeommatidae (Family)
 Imisia Brusina, 1870 accepted as Galeomma Turton, 1825 · Animalia (Kingdom) > Mollusca (Phylum) > Bivalvia (Class) > Venerida (Order) > Galeommatidae (Family)

Imitatrix
     Imitatrix Gurevich, 1963 † (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Ostracoda (Class) > Ostracoda (awaiting allocation) (Order) > Ostracoda (awaiting allocation) (Family)
     Imitatrix Westerlund, 1884 (uncertain)· Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Stylommatophora (Order) > Clausiliidae (Family)

Imogine
 Imogine Girard, 1853 accepted as Imogine Marcus & Marcus, 1968 · Animalia (Kingdom) > Platyhelminthes (Phylum) > Turbellaria (Class) > Polycladida (Order) > Stylochidae (Family)
     Imogine Marcus & Marcus, 1968 · Animalia (Kingdom) > Platyhelminthes (Phylum) > Turbellaria (Class) > Polycladida (Order) > Stylochidae (Family)

Imperata
     Imperata delle Chiaje, 1841 (uncertain)· Animalia (Kingdom) > Cnidaria (Phylum) > Cnidaria (awaiting allocation) (Class) > Cnidaria (awaiting allocation) (Order) > Cnidaria (awaiting allocation) (Family)
     Imperata Cyrillo, 1792 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Poales (Order) > Poaceae (Family)

Imperatoria
     Imperatoria de Gregorio, 1930 † (uncertain)· Animalia (Kingdom) > Echinodermata (Phylum) > Echinodermata (awaiting allocation) (Class) > Echinodermata (awaiting allocation) (Order) > Echinodermata (awaiting allocation) (Family)
     Imperatoria Matthes, 1952 † (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Mammalia (Class) > Creodonta (Order) > Hyaenodontidae (Family)
     Imperatoria Parona, 1933 † · Animalia (Kingdom) > Porifera (Phylum) > Hexactinellida (Class) > Sphinctozoa (Order) > Sebargasiidae (Family)
 Imperatoria Linnaeus, 1753 accepted as Peucedanum Linnaeus, 1753 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Apiales (Order) > Apiaceae (Family)

Imperfecta
     Imperfecta Méhelÿ, 1935 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Hemiptera (awaiting allocation) (Family)
 Imperfecta Busch, 1948 accepted as Buschiella Corliss, 1960 · Chromista (Kingdom) > Ciliophora (Phylum) > Ciliophora (awaiting allocation) (Class) > Ciliophora (awaiting allocation) (Order) > Ciliophora (awaiting allocation) (Family)

Inachus
     Inachus Hisinger, 1837 † (uncertain)· Animalia (Kingdom) > Mollusca (Phylum) > Mollusca (awaiting allocation) (Class) > Mollusca (awaiting allocation) (Order) > Mollusca (awaiting allocation) (Family)
     Inachus Weber, 1795 · Animalia (Kingdom) > Arthropoda (Phylum) > Malacostraca (Class) > Decapoda (Order) > Inachidae (Family)

Inactis
 Inactis (M. Gomont) O. Kirchner in Engler & Prantl, 1898 accepted as Schizothrix Kützing ex Gomont, 1892 · Bacteria (Kingdom) > Cyanobacteria (Phylum) > Cyanophyceae (Class) > Oscillatoriales (Order) > Oscillatoriaceae (Family)
 Inactis Thuret, 1875 accepted as Schizothrix Kützing ex Gomont, 1892 · Bacteria (Kingdom) > Cyanobacteria (Phylum) > Cyanophyceae (Class) > Synechococcales (Order) > Schizotrichaceae (Family)
 Inactis Kützing, 1843 accepted as Schizothrix Kützing ex Gomont, 1892 · Bacteria (Kingdom) > Cyanobacteria (Phylum) > Cyanophyceae (Class) > Synechococcales (Order) > Schizotrichaceae (Family)

Inapertisporites
     Inapertisporites T. van der Hammen, 1954 † · Plantae (Kingdom) > Sporae dispersae (Phylum) > (Class) > (Order) > (Family)
     Inapertisporites G.E. Rouse, 1959 † accepted as Inapertisporites T. van der Hammen, 1954 † (junior objective synonym)· Plantae (Kingdom) > Sporae dispersae (Phylum) > (Class) > (Order) > (Family)

Inca
     Inca Lepeletier & Serville, 1828 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Scarabaeidae (Family)
 Inca Klapálek, 1914 accepted as Inconeuria Klapálek, 1916 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Plecoptera (Order) > Perlidae (Family)
 Inca Klapálek, 1916 accepted as Inconeuria Klapálek, 1916 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Plecoptera (Order) > Perlidae (Family)
     Inca Jardine, 1850 (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Aves (Class) > Aves (awaiting allocation) (Order) > Aves (awaiting allocation) (Family)
     Inca Warren, 1894 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Lepidoptera (awaiting allocation) (Family)
 Inca Taczanowski, 1879 accepted as Aspidolasius Simon, 1888 · Animalia (Kingdom) > Arthropoda (Phylum) > Arachnida (Class) > Araneae (Order) > Araneidae (Family)

Incisocalliope
     Incisocalliope Brandt, 1959 · Animalia (Kingdom) > Arthropoda (Phylum) > Malacostraca (Class) > Amphipoda (Order) > Pleustidae (Family)
     Incisocalliope J.L. Barnard & Reish, 1959 · Animalia (Kingdom) > Arthropoda (Phylum) > Malacostraca (Class) > Amphipoda (Order) > Pleustidae (Family)

Incudifera
     Incudifera Fletcher, 1979 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Lepidoptera (awaiting allocation) (Family)
     Incudifera Wehrli, 1934 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Lepidoptera (awaiting allocation) (Family)

Indanobium
     Indanobium Español, 1965 accepted as Indanobium Español, 1970 (nomen nudum)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Ptinidae (Family)
     Indanobium Español, 1970 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Ptinidae (Family)

Indiana
 Indiana Tutt, 1903 accepted as Indiana Tutt, 1903 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Lepidoptera (awaiting allocation) (Family)
 Indiana Chakravatz, 1943 accepted as Indiana Chakravatz, 1943 · Animalia (Kingdom) > Nematoda (Phylum) > Chromadorea (Class) > Spirurida (Order) > Travassosinematidae (Family)
 Indiana S.W. Khade, 2010 accepted as · Fungi (Kingdom) > Glomeromycota (Phylum) > Glomeromycetes (Class) > Diversisporales (Order) > Pacisporaceae (Family)
 Indiana Matthew, 1902 † accepted as Indianites Ulrich & Bassler, 1931 † · Animalia (Kingdom) > Arthropoda (Phylum) > Ostracoda (Class) > Archaeocopida (Order) > Indianidae (Family)

Indiaster
     Indiaster Raghavendra Rao, 1957 † (uncertain)· Animalia (Kingdom) > Echinodermata (Phylum) > Asteroidea (Class) > Asteroidea (awaiting allocation) (Order) > Asteroidea (awaiting allocation) (Family)
 Indiaster Lambert, 1920 accepted as Brisaster Gray, 1855 · Animalia (Kingdom) > Echinodermata (Phylum) > Echinoidea (Class) > Spatangoida (Order) > Schizasteridae (Family)

Indicator
     Indicator Vieillot, 1816 (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Aves (Class) > Aves (awaiting allocation) (Order) > Aves (awaiting allocation) (Family)
     Indicator Stephens in Shaw, 1815 · Animalia (Kingdom) > Chordata (Phylum) > Aves (Class) > Piciformes (Order) > Indicatoridae (Family)

Indiella
 Indiella Blattný, 1925 accepted as Sognorus Reitter, 1881 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Staphylinidae (Family)
 Indiella Brumpt, 1906 accepted as Madurella M.E. Brumpt, 1905 · Fungi (Kingdom) > Ascomycota (Phylum) > Sordariomycetes (Class) > Sordariales (Order) > Sordariales incertae sedis (Family)
 Indiella Sautya, Tabachnick & Ingole, 2011 accepted as Carlsbergia Gaudin, 2019 · Animalia (Kingdom) > Porifera (Phylum) > Hexactinellida (Class) > Hexactinosida (Order) > Aulocalycidae (Family)

Indiochaitophorus
     Indiochaitophorus Verma, 1969 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Hemiptera (awaiting allocation) (Family)
     Indiochaitophorus Verma & Das in Verma & Das, 1992 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Aphididae (Family)

Indirana
     Indirana Bauer, 1985 accepted as Walkerana Dahanukar, Modak, Krutha, Nameer, Padhye & Molur, 2016 (nomen nudum)· Animalia (Kingdom) > Chordata (Phylum) > Amphibia (Class) > Anura (Order) > Ranixalidae (Family)
     Indirana Laurent, 1986 · Animalia (Kingdom) > Chordata (Phylum) > Amphibia (Class) > Anura (Order) > Ranixalidae (Family)

Indoceras
 Indoceras Schlüter, 1928 † accepted as Idoceras Burckhardt, 1906 † · Animalia (Kingdom) > Mollusca (Phylum) > Cephalopoda (Class) > Ammonitida (Order) > Perisphinctidae (Family)
     Indoceras Noetling, 1897 † · Animalia (Kingdom) > Mollusca (Phylum) > Cephalopoda (Class) > Ammonitida (Order) > Sphenodiscidae (Family)

Indoleon
     Indoleon Banks, 1913 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Neuroptera (Order) > Neuroptera (awaiting allocation) (Family)
     Indoleon Fraser, 1952 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Neuroptera (Order) > Neuroptera (awaiting allocation) (Family)

Indoquedius
     Indoquedius Blackwelder, 1952 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Staphylinidae (Family)
 Indoquedius Cameron, 1932 accepted as Indoquedius Blackwelder, 1952 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Staphylinidae (Family)

Indoseius
 Indoseius Ghai & Menon, 1970 accepted as Indoseiulus Ehara, 1982 · Animalia (Kingdom) > Arthropoda (Phylum) > Arachnida (Class) > Mesostigmata (Order) > Phytoseiidae (Family)
 Indoseius Evans, 1955 accepted as Neocypholaelaps Vitzthum, 1943 · Animalia (Kingdom) > Arthropoda (Phylum) > Arachnida (Class) > Mesostigmata (Order) > Ameroseiidae (Family)

Indosinia
     Indosinia Cossmann, 1920 † (uncertain)· Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Coenogastropoda incertae sedis (Order) > Acteoninidae (Family)
     Indosinia J.E. Vidal, 1965 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Malpighiales (Order) > Ochnaceae (Family)

Indosphaera
     Indosphaera Attems, 1936 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Diplopoda (Class) > Diplopoda (awaiting allocation) (Order) > (Family)
     Indosphaera Attems, 1935 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Diplopoda (Class) > Diplopoda (awaiting allocation) (Order) > (Family)
     Indosphaera A. Kumar, 1986 † · Chromista (Kingdom) > Miozoa (Phylum) > Dinophyceae (Class) > Peridiniales (Order) > Peridiniaceae (Family)
 Indosphaera Jankowski, 1985 accepted as Epistylis Ehrenberg, 1830 · Chromista (Kingdom) > Ciliophora (Phylum) > Oligohymenophorea (Class) > Peritrichida (Order) > Epistylididae (Family)

Indosyrphus
     Indosyrphus Kohli, Kapoor & Gupta, 1988 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Syrphidae (Family)
     Indosyrphus Kohli, 1987 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Syrphidae (Family)

Indotheca
     Indotheca R.V. Sitholey in B. Sahni & R.V. Sitholey, 1943 † (uncertain)· Plantae (Kingdom) > Plantae (awaiting allocation) (Phylum) > Plantae (awaiting allocation) (Class) > Plantae (awaiting allocation) (Order) > Plantae (awaiting allocation) (Family)
 Indotheca Stach, 1956 accepted as Sphaeridia Linnaniemi, 1912 · Animalia (Kingdom) > Arthropoda (Phylum) > Collembola (Class) > Symphypleona (Order) > Sminthurididae (Family)

Indotherium
     Indotherium Yadagiri, 1984 † · Animalia (Kingdom) > Chordata (Phylum) > Mammaliaformes incertae sedis (Class) > Morganucodonta (Order) > Morganucodontidae (Family)
 Indotherium Kretzoi, 1942 † accepted as Brachypotherium Roger, 1904 † · Animalia (Kingdom) > Chordata (Phylum) > Mammalia (Class) > Perissodactyla (Order) > Rhinocerotidae (Family)

Indris
 Indris Ashmead, 1887 accepted as Idris Förster, 1856 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Scelionidae (Family)
 Indris Cuvier, 1800 accepted as Indri Geoffroy, 1796 · Animalia (Kingdom) > Chordata (Phylum) > Mammalia (Class) > Primates (Order) > Indriidae (Family)

Indumasonaphis
     Indumasonaphis (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Hemiptera (awaiting allocation) (Family)
     Indumasonaphis Ghosh, Basu & Raychaudhuri, 1977 † (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Aphididae (Family)

Indusa
 Indusa Handlirsch, 1907 † accepted as Indusa Handlirsch, 1907 † · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Trichoptera (Order) > Trichoptera (awaiting allocation) (Family)
 Indusa Richardson, 1905 accepted as Ichthyoxenus auctt. · Animalia (Kingdom) > Arthropoda (Phylum) > Malacostraca (Class) > Isopoda (Order) > Cymothoidae (Family)

Indusius
     Indusius Gunnell, Gingerich, Ul-Haq, Bloch, Khan & Clyde, 2008 † · Animalia (Kingdom) > Chordata (Phylum) > Mammalia (Class) > Primates (Order) > Omomyidae (Family)
     Indusius Barraud, 1934 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Culicidae (Family)

Inella
     Inella Bayle, 1879 · Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Ptenoglossa (Order) > Triphoridae (Family)
     Inella Repina in Repina et al., 1964 † · Animalia (Kingdom) > Arthropoda (Phylum) > Trilobita (Class) > Redlichiida (Order) > Neoredlichiidae (Family)

Inermia
     Inermia Korobkov, 1955 † (uncertain)· Animalia (Kingdom) > Mollusca (Phylum) > Mollusca (awaiting allocation) (Class) > Mollusca (awaiting allocation) (Order) > Mollusca (awaiting allocation) (Family)
 Inermia Poey, 1860 accepted as Haemulon Cuvier, 1829 · Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Perciformes (Order) > Haemulidae (Family)

Inermodorus
 Inermodorus Gaud & Mouchet, 1959 accepted as Inermodorsus Gaud & Mouchet, 1959 · Animalia (Kingdom) > Arthropoda (Phylum) > Arachnida (Class) > Astigmata (Order) > Syringobiidae (Family)
 Inermodorus Zoological Record, 1961 accepted as Inermodorsus Gaud & Mouchet, 1959 · Animalia (Kingdom) > Arthropoda (Phylum) > Arachnida (Class) > Astigmata (Order) > Syringobiidae (Family)

Inezia
     Inezia E.P. Phillips, 1932 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Asterales (Order) > Asteraceae (Family)
 Inezia Roewer, 1913 accepted as Santinezia Roewer, 1923 · Animalia (Kingdom) > Arthropoda (Phylum) > Arachnida (Class) > Opiliones (Order) > Cranaidae (Family)
     Inezia Cherrie, 1909 · Animalia (Kingdom) > Chordata (Phylum) > Aves (Class) > Passeriformes (Order) > Tyrannidae (Family)

Inferiolabiata
     Inferiolabiata Broch, 1951 · Animalia (Kingdom) > Cnidaria (Phylum) > Hydrozoa (Class) > Anthoathecata (Order) > Stylasteridae (Family)
 Inferiolabiata Cairns, 1983 accepted as Inferiolabiata Broch, 1951 · Animalia (Kingdom) > Cnidaria (Phylum) > Hydrozoa (Class) > Anthoathecata (Order) > Stylasteridae (Family)

Inflatulum
     Inflatulum Carpenter, 1857 accepted as Inflatulum Carpenter, 1857 (nomen nudum)· Animalia (Kingdom) > Mollusca (Phylum) > Mollusca (awaiting allocation) (Class) > Mollusca (awaiting allocation) (Order) > Mollusca (awaiting allocation) (Family)
     Inflatulum Carpenter, 1858 (uncertain)· Animalia (Kingdom) > Mollusca (Phylum) > Mollusca (awaiting allocation) (Class) > Mollusca (awaiting allocation) (Order) > Mollusca (awaiting allocation) (Family)

Infundibulum
     Infundibulum Sowerby, 1815 (uncertain)· Animalia (Kingdom) > Mollusca (Phylum) > Mollusca (awaiting allocation) (Class) > Mollusca (awaiting allocation) (Order) > Mollusca (awaiting allocation) (Family)
 Infundibulum Velenovský, 1934 accepted as Peziza Dillenius ex E.M. Fries, 1822 · Fungi (Kingdom) > Ascomycota (Phylum) > Pezizomycetes (Class) > Pezizales (Order) > Pezizaceae (Family)
     Infundibulum Montfort, 1810 · Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Trochida (Order) > Trochidae (Family)

Inga
     Inga P. Miller, 1754 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Fabales (Order) > Fabaceae (Family)
     Inga Busck, 1908 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Oecophoridae (Family)

Ingenhoussia
 Ingenhoussia Dennstedt, 1818 accepted as Ingenhoussia Dennstedt, 1818 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Vitales (Order) > Vitaceae (Family)
     Ingenhoussia E.H.F. Meyer, 1836 (uncertain)· Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Fabales (Order) > Fabaceae (Family)

Ingenia
     Ingenia Gerlach, 1957 · Animalia (Kingdom) > Nematoda (Phylum) > Enoplea (Class) > Tripyloidida (Order) > Tripyloididae (Family)
     Ingenia Barsbold, 1981 † · Animalia (Kingdom) > Chordata (Phylum) > Reptilia (Class) > Saurischia (Order) > Oviraptoridae (Family)

Iniopachys
 Iniopachys Lacordaire, 1854 accepted as Carabus Linnaeus, 1758 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Carabidae (Family)
 Iniopachys Géhin, 1885 accepted as Carabus Linnaeus, 1758 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Carabidae (Family)

Inistius
 Inistius accepted as Isistius Gill, 1865 · Animalia (Kingdom) > Chordata (Phylum) > Chondrichthyes (Class) > Squaliformes (Order) > Dalatiidae (Family)
 Inistius accepted as Iniistius Gill, 1862 · Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Perciformes (Order) > Labridae (Family)

Inmalthodes
 Inmalthodes Wittmer, 1940 accepted as Inmalthodes Wittmer, 1940 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Coleoptera (awaiting allocation) (Family)
     Inmalthodes Pic, 1938 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Cantharidae (Family)

Ino
 Ino Hinds, 1843 accepted as Inella Bayle, 1879 · Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Ptenoglossa (Order) > Triphoridae (Family)
     Ino Laporte, 1835 accepted as Inopeplus Smith, 1851 (junior homonym)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Salpingidae (Family)
     Ino Leach in Samouelle, 1819 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Lepidoptera (awaiting allocation) (Family)
     Ino Schrank, 1803 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Crustacea (awaiting allocation) (Class) > Crustacea (awaiting allocation) (Order) > Crustacea (awaiting allocation) (Family)
     Ino Koch, 1850 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Arachnida (Class) > Arachnida (awaiting allocation) (Order) > Arachnida (awaiting allocation) (Family)

Inoceramus
     Inoceramus J. Sowerby, 1814 † · Animalia (Kingdom) > Mollusca (Phylum) > Bivalvia (Class) > Myalinida (Order) > Inoceramidae (Family)
 Inoceramus Parkinson, 1819 † accepted as Inoceramus J. Sowerby, 1814 † · Animalia (Kingdom) > Mollusca (Phylum) > Bivalvia (Class) > Myalinida (Order) > Inoceramidae (Family)

Inoderma
 Inoderma M.J. Berkeley, 1881 accepted as Mesophellia M.J. Berkeley, 1857 · Fungi (Kingdom) > Basidiomycota (Phylum) > Agaricomycetes (Class) > Hysterangiales (Order) > Mesophelliaceae (Family)
 Inoderma (Acharius) S.F. Gray, 1821 accepted as Thrombium Wallroth, 1831 · Fungi (Kingdom) > Ascomycota (Phylum) > Dothideomycetes (Class) > Dothideomycetes incertae sedis (Order) > Thrombiaceae (Family)
 Inoderma P.A. Karsten, 1879 accepted as Inonotus P.A. Karsten, 1879 · Fungi (Kingdom) > Basidiomycota (Phylum) > Agaricomycetes (Class) > Hymenochaetales (Order) > Hymenochaetaceae (Family)
     Inoderma Kützing, 1833 · Plantae (Kingdom) > Chlorophyta (Phylum) > Chlorophyceae (Class) > Chlamydomonadales (Order) > Palmellaceae (Family)

Inodes
 Inodes O.F. Cook, 1901 accepted as Sabal Adanson, 1763 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Arecales (Order) > Arecaceae (Family)
 Inodes de Laubenfels, 1957 accepted as Hyrtios Duchassaing & Michelotti, 1864 · Animalia (Kingdom) > Porifera (Phylum) > Demospongea (Class) > Dictyoceratida (Order) > Thorectidae (Family)

Inosomus
     Inosomus Broun, 1882 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Curculionidae (Family)
 Inosomus Hutton, 1904 accepted as Inosomus Broun, 1882 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Curculionidae (Family)

Insidiator
 Insidiator Amyot, 1846 accepted as Insidiator Amyot, 1846 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Hemiptera (awaiting allocation) (Family)
 Insidiator Jordan & Snyder, 1900 accepted as Suggrundus Whitley, 1930 · Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Scorpaeniformes (Order) > Platycephalidae (Family)

Insignia
     Insignia Angelov, 1972 (uncertain)· Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Littorinimorpha (Order) > Hydrobiidae (Family)
     Insignia Astrova, 1965 † · Animalia (Kingdom) > Bryozoa (Phylum) > Stenolaemata (Class) > Cryptostomida (Order) > Cryptostomida (awaiting allocation) (Family)

Insula
     Insula Zhou & Li, 2013 · Animalia (Kingdom) > Arthropoda (Phylum) > Arachnida (Class) > Araneae (Order) > Salticidae (Family)
     Insula Kunkel, 1910 · Animalia (Kingdom) > Arthropoda (Phylum) > Malacostraca (Class) > Amphipoda (Order) > Hyalidae (Family)

Insulahypnus
     Insulahypnus Stibick, 1979 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Elateridae (Family)
     Insulahypnus Stibick, 1976 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Elateridae (Family)

Insulanus
     Insulanus Fleutiaux, 1930 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Eucnemidae (Family)
 Insulanus Sublette, 1967 † accepted as Xestochironomus Sublette & Wirth, 1972 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Chironomidae (Family)
     Insulanus Linnavuori, 1960 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Hemiptera (awaiting allocation) (Family)

Insulodrilus
     Insulodrilus Brinkhurst, 1966 (uncertain)· Animalia (Kingdom) > Annelida (Phylum) > Clitellata (Class) > Oligochaeta (awaiting allocation) (Order) > Oligochaeta (awaiting allocation) (Family)
     Insulodrilus Brinkhurst, 1991 · Animalia (Kingdom) > Annelida (Phylum) > Clitellata (Class) > Haplotaxida (Order) > Phreodrilidae (Family)

Integraster
 Integraster Döderlein, 1920 accepted as Luidia Forbes, 1839 · Animalia (Kingdom) > Echinodermata (Phylum) > Asteroidea (Class) > Platyasterida (Order) > Luidiidae (Family)
 Integraster Lambert & Thiéry, 1924 accepted as Holanthus Lambert & Thiéry, 1924 · Animalia (Kingdom) > Echinodermata (Phylum) > Echinoidea (Class) > Spatangoida (Order) > Hemiasteridae (Family)

Intermedia
 Intermedia Chao, 1992 accepted as Sphenometopa Townsend, 1908 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Sarcophagidae (Family)
 Intermedia Caziot, 1910 accepted as Intermedia Caziot, 1910 · Animalia (Kingdom) > Mollusca (Phylum) > Mollusca (awaiting allocation) (Class) > Mollusca (awaiting allocation) (Order) > Mollusca (awaiting allocation) (Family)

Intermediana
     Intermediana Germain, 1903 (uncertain)· Animalia (Kingdom) > Mollusca (Phylum) > Mollusca (awaiting allocation) (Class) > Mollusca (awaiting allocation) (Order) > Mollusca (awaiting allocation) (Family)
     Intermediana Locard, 1890 (uncertain)· Animalia (Kingdom) > Mollusca (Phylum) > Mollusca (awaiting allocation) (Class) > Mollusca (awaiting allocation) (Order) > Mollusca (awaiting allocation) (Family)

Intermediopsyllus
     Intermediopsyllus Kunz, 1962 accepted as Scottopsyllus Apostolov & Marinov, 1988 (nomen nudum)· Animalia (Kingdom) > Arthropoda (Phylum) > Maxillopoda (Class) > Harpacticoida (Order) > Paramesochridae (Family)
 Intermediopsyllus Huys, 2009 accepted as Scottopsyllus Apostolov & Marinov, 1988 · Animalia (Kingdom) > Arthropoda (Phylum) > Maxillopoda (Class) > Harpacticoida (Order) > Paramesochridae (Family)

Inti
     Inti Hansson, 2010 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Eulophidae (Family)
     Inti M.A. Blanco, 2007 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Asparagales (Order) > Orchidaceae (Family)

Intrasporeocoelia
     Intrasporeocoelia Fan & Zhang, 1985 † · Animalia (Kingdom) > Porifera (Phylum) > Calcarea (Class) > Permosphincta (Order) > Permosphincta (awaiting allocation) (Family)
     Intrasporeocoelia Fan & Zhang, 1986 † (uncertain)· Animalia (Kingdom) > Porifera (Phylum) > Calcarea (Class) > Calcarea (awaiting allocation) (Order) > Calcarea (awaiting allocation) (Family)

Intybellia
     Intybellia Cassini, 1821 (uncertain)· Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Asterales (Order) > Asteraceae (Family)
 Intybellia A. Monnier, 1829 accepted as · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Asterales (Order) > Asteraceae (Family)

Intybus
 Intybus E.M. Fries, 1828 accepted as · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Asterales (Order) > Asteraceae (Family)
     Intybus Zinn, 1757 (uncertain)· Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Asterales (Order) > Asteraceae (Family)

Investigator
 Investigator Goode in Goode & Bean, 1896 accepted as Nemichthys Richardson, 1848 · Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Anguilliformes (Order) > Nemichthyidae (Family)
     Investigator Stewart, 1909 · Animalia (Kingdom) > Priapulida (Phylum) > (Class) > Priapulida incertae sedis (Order) > (Family)

Io
 Io Blanchard in Gay, 1852 accepted as Adetomeris Michener, 1949 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Saturniidae (Family)
     Io B. Nordenstam, 2003 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Asterales (Order) > Asteraceae (Family)
     Io Lea, 1831 · Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Sorbeoconcha (Order) > Pleuroceridae (Family)

Ioanella
     Ioanella B. Granier & P.Y. Berthou in Bucur & Filipescu, 2002 † · Plantae (Kingdom) > Chlorophyta (Phylum) > Ulvophyceae (Class) > Dasycladales (Order) > Polyphysaceae (Family)
     Ioanella Saidova, 1975 · Chromista (Kingdom) > Retaria (Phylum) > Globothalamea (Class) > Rotaliida (Order) > Eponididae (Family)

Iodes
     Iodes Leach, 1847 accepted as Iodes Leach, 1847 (nomen nudum)· Animalia (Kingdom) > Mollusca (Phylum) > Mollusca (awaiting allocation) (Class) > Mollusca (awaiting allocation) (Order) > Mollusca (awaiting allocation) (Family)
 Iodes Mörch, 1860 accepted as Janthina Röding, 1798 · Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Ptenoglossa (Order) > Janthinidae (Family)
     Iodes Gray, 1847 (uncertain)· Animalia (Kingdom) > Mollusca (Phylum) > Mollusca (awaiting allocation) (Class) > Mollusca (awaiting allocation) (Order) > Mollusca (awaiting allocation) (Family)
     Iodes Blume, 1825 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Icacinales (Order) > Icacinaceae (Family)

Iodina
 Iodina Mörch, 1860 accepted as Janthina Röding, 1798 · Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Ptenoglossa (Order) > Janthinidae (Family)
 Iodina Miers, 1851 accepted as Jodina W.J. Hooker & Arnott ex C.F. Meisner, 1837 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Santalales (Order) > Santalaceae (Family)

Iole
 Iole Pascoe, 1858 accepted as Serixia Pascoe, 1856 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Cerambycidae (Family)
     Iole Richardson, 1905 accepted as Tole Ortmann, 1901 (unjustified emendation)· Animalia (Kingdom) > Arthropoda (Phylum) > Malacostraca (Class) > Isopoda (Order) > Janiridae (Family)
     Iole Blyth, 1844 · Animalia (Kingdom) > Chordata (Phylum) > Aves (Class) > Passeriformes (Order) > Pycnonotidae (Family)
 Iole A. Adams, 1860 † accepted as Iolaea A. Adams, 1867 · Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Heterostropha (Order) > Pyramidellidae (Family)

Iolina
 Iolina Baily, 1948 † accepted as Iolaea A. Adams, 1867 · Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Heterostropha (Order) > Pyramidellidae (Family)
     Iolina Pritchard, 1956 · Animalia (Kingdom) > Arthropoda (Phylum) > Arachnida (Class) > Actinedida (Order) > Iolinidae (Family)

Ione
     Ione Latreille, 1818 · Animalia (Kingdom) > Arthropoda (Phylum) > Malacostraca (Class) > Isopoda (Order) > Ionidae (Family)
 Ione Lindley, 1853 accepted as Sunipia J. Lindley, 1826 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Asparagales (Order) > Orchidaceae (Family)

Ionia
     Ionia Perestenko, 1996 · Plantae (Kingdom) > Rhodophyta (Phylum) > Florideophyceae (Class) > Gigartinales (Order) > Kallymeniaceae (Family)
     Ionia Ball, 1933 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Hemiptera (awaiting allocation) (Family)

Ionopezia
     Ionopezia N. Van Vooren, 2020 · Fungi (Kingdom) > Ascomycota (Phylum) > Pezizomycetes (Class) > Pezizales (Order) > Pezizaceae (Family)
 Ionopezia N. Matočec, I. Kušan & M. Jadan in Yuan et al., 2020 accepted as Ionopezia N. Van Vooren, 2020 · Fungi (Kingdom) > Ascomycota (Phylum) > Pezizomycetes (Class) > Pezizales (Order) > Pezizaceae (Family)

Ionopsis
 Ionopsis Lutz, 1909 accepted as Ionopsis Lutz, 1909 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Tabanidae (Family)
     Ionopsis Kunth in Humboldt, Bonpland & Kunth, 1816 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Asparagales (Order) > Orchidaceae (Family)

Ionumnia
     Ionumnia J.M.H. Shaw, 2005 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Asparagales (Order) > Orchidaceae (Family)
 Ionumnia J.M.H. Shaw, 2004 accepted as Ionumnia J.M.H. Shaw, 2005 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Asparagales (Order) > Orchidaceae (Family)

Iophon
     Iophon Gray, 1867 · Animalia (Kingdom) > Porifera (Phylum) > Demospongea (Class) > Poecilosclerida (Order) > Acarnidae (Family)
     Iophon Champion, 1895 accepted as Jophon Champion, 1895 (misspelling - incorrect original spelling)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Tenebrionidae (Family)

Iospilus
     Iospilus Viguier, 1886 · Animalia (Kingdom) > Annelida (Phylum) > Polychaeta (Class) > Phyllodocida (Order) > Iospilidae (Family)
 Iospilus Augener, 1922 accepted as Iospilus Viguier, 1886 · Animalia (Kingdom) > Annelida (Phylum) > Polychaeta (Class) > Phyllodocida (Order) > Iospilidae (Family)

Iota
     Iota Saussure, 1854 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Hymenoptera (awaiting allocation) (Family)
 Iota Cobb, 1913 accepted as Hemicriconemoides Chitwood & Birchfield, 1957 · Animalia (Kingdom) > Nematoda (Phylum) > Chromadorea (Class) > Panagrolaimida (Order) > Criconematidae (Family)

Iotaraia
     Iotaraia Jordan, 1925 (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Pisces (awaiting allocation) (Class) > Pisces (awaiting allocation) (Order) > Pisces (awaiting allocation) (Family)
 Iotaraia Leigh-Sharpe, 1924 accepted as Raja Linnaeus, 1758 · Animalia (Kingdom) > Chordata (Phylum) > Chondrichthyes (Class) > Rajiformes (Order) > Rajidae (Family)

Iotomia
 Iotomia Lioy, 1863 accepted as Potamia Robineau-Desvoidy, 1830 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Muscidae (Family)
 Iotomia Casey, 1922 accepted as Coelonertus Solari, 1906 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Curculionidae (Family)

Iotonchus
     Iotonchus Andrássy, 1958 · Animalia (Kingdom) > Nematoda (Phylum) > Dorylaimea (Class) > Mononchida (Order) > Mononchidae (Family)
     Iotonchus Cobb, 1916 · Animalia (Kingdom) > Nematoda (Phylum) > Dorylaimea (Class) > Mononchida (Order) > Mononchidae (Family)

Iotuba
     Iotuba Chen & Zhou, 1997 † · Animalia (Kingdom) > Phoronida (Phylum) > (Class) > (Order) > Phoronidae (Family)
     Iotuba Zhang & Smith, 2023 † accepted as Iotuba Zhang & Smith, 2023 † (unavailable name)· Animalia (Kingdom) > Annelida (Phylum) > Polychaeta (Class) > Flabelligerida (Order) > (Family)

Ipana
 Ipana Jordan, 1896 accepted as Ipanica Hampson, 1910 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Noctuidae (Family)
     Ipana Walker, 1858 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Geometridae (Family)

Iphiclus
     Iphiclus Chevrolat in Dejean, 1836 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Erotylidae (Family)
 Iphiclus Chevrolat, 1840 accepted as Iphiclus Chevrolat in Dejean, 1836 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Erotylidae (Family)

Iphiculus
     Iphiculus Adams & White, 1849 · Animalia (Kingdom) > Arthropoda (Phylum) > Malacostraca (Class) > Decapoda (Order) > Iphiculidae (Family)
     Iphiculus White, 1847 accepted as Iphiculus Adams & White, 1849 (nomen nudum)· Animalia (Kingdom) > Arthropoda (Phylum) > Malacostraca (Class) > Decapoda (Order) > Iphiculidae (Family)

Iphidea
 Iphidea Billings, 1872 † accepted as Paterina Beecher, 1891 † · Animalia (Kingdom) > Brachiopoda (Phylum) > Paterinata (Class) > Paterinida (Order) > Paterinidae (Family)
 Iphidea Baly, 1865 accepted as Atrachya Dejean, 1836 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Chrysomelidae (Family)

Iphidella
 Iphidella Walcott, 1905 † accepted as Paterina Beecher, 1891 † · Animalia (Kingdom) > Brachiopoda (Phylum) > Paterinata (Class) > Paterinida (Order) > Paterinidae (Family)
 Iphidella Walcott, 1912 † accepted as Dictyonina Cooper, 1942 † · Animalia (Kingdom) > Brachiopoda (Phylum) > Paterinata (Class) > Paterinida (Order) > Paterinidae (Family)

Iphidulus
     Iphidulus Berlese, 1887 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Arachnida (Class) > Mesostigmata (Order) > Phytoseiidae (Family)
     Iphidulus Ribaga, 1904 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Arachnida (Class) > Acari (awaiting allocation) (Order) > Acari (awaiting allocation) (Family)

Iphigeneia
 Iphigeneia Sars, 1896 accepted as Iphigenella G.O. Sars, 1896 · Animalia (Kingdom) > Arthropoda (Phylum) > Malacostraca (Class) > Amphipoda (Order) > Iphigenellidae (Family)
 Iphigeneia Thomson, 1882 accepted as Iphinotus Stebbing, 1899 · Animalia (Kingdom) > Arthropoda (Phylum) > Malacostraca (Class) > Amphipoda (Order) > Phliantidae (Family)

Iphigenia
 Iphigenia O. G. Costa, 1850 accepted as Spinosipella Iredale, 1930 · Animalia (Kingdom) > Mollusca (Phylum) > Bivalvia (Class) > Anomalodesmata (Order) > Verticordiidae (Family)
     Iphigenia Thomson, 1882 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Crustacea (awaiting allocation) (Class) > Crustacea (awaiting allocation) (Order) > Crustacea (awaiting allocation) (Family)
     Iphigenia Kunth, 1843 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Liliales (Order) > Colchicaceae (Family)
     Iphigenia Schumacher, 1817 · Animalia (Kingdom) > Mollusca (Phylum) > Bivalvia (Class) > Venerida (Order) > Donacidae (Family)
 Iphigenia Gray in Turton, 1840 accepted as Iphigenia Gray in Turton, 1840 · Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Stylommatophora (Order) > Clausiliidae (Family)

Iphimedia
 Iphimedia Duchassaing in A. Milne-Edwards, 1866 accepted as Platyactaea Guinot, 1967 · Animalia (Kingdom) > Arthropoda (Phylum) > Malacostraca (Class) > Decapoda (Order) > Xanthidae (Family)
     Iphimedia Rathke, 1843 · Animalia (Kingdom) > Arthropoda (Phylum) > Malacostraca (Class) > Amphipoda (Order) > Iphimediidae (Family)

Iphimediopsis
 Iphimediopsis Schellenberg, 1931 accepted as Iphimedia Rathke, 1843 · Animalia (Kingdom) > Arthropoda (Phylum) > Malacostraca (Class) > Amphipoda (Order) > Iphimediidae (Family)
     Iphimediopsis Della Valle, 1893 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Crustacea (awaiting allocation) (Class) > Crustacea (awaiting allocation) (Order) > Crustacea (awaiting allocation) (Family)

Iphinoe
     Iphinoe Spaeth, 1898 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Chrysomelidae (Family)
 Iphinoe H. Adams & A. Adams, 1856 accepted as Neoiphinoe Habe, 1978 · Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Littorinimorpha (Order) > Capulidae (Family)
     Iphinoe Bate, 1856 · Animalia (Kingdom) > Arthropoda (Phylum) > Malacostraca (Class) > Cumacea (Order) > Bodotriidae (Family)
 Iphinoe Rafinesque, 1815 accepted as Uroctea Dufour, 1820 · Animalia (Kingdom) > Arthropoda (Phylum) > Arachnida (Class) > Araneae (Order) > Oecobiidae (Family)
     Iphinoe V. Lamprinou & A. Pantazidou in Lamprinou, Hernandez-Marine, Canals, Kormas, Economou-Amilli & Pantazidou, 2011 · Bacteria (Kingdom) > Cyanobacteria (Phylum) > Cyanophyceae (Class) > Nostocales (Order) > Symphyonemataceae (Family)

Iphinoë
 Iphinoë Bate, 1856 accepted as Iphinoe Bate, 1856 · Animalia (Kingdom) > Arthropoda (Phylum) > Malacostraca (Class) > Cumacea (Order) > Bodotriidae (Family)
 Iphinoë Spaeth, 1898 accepted as Aspidimorpha Hope, 1840 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Chrysomelidae (Family)

Iphionyx
 Iphionyx Krøyer, 1845 accepted as Candacia Dana, 1846 · Animalia (Kingdom) > Arthropoda (Phylum) > Maxillopoda (Class) > Calanoida (Order) > Candaciidae (Family)
 Iphionyx Dana, 1852 accepted as Candacia Dana, 1846 · Animalia (Kingdom) > Arthropoda (Phylum) > Maxillopoda (Class) > Calanoida (Order) > Candaciidae (Family)

Iphipus
     Iphipus Schoenherr, 1835 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Curculionidae (Family)
     Iphipus Schönherr, 1833 accepted as Iphipus Schoenherr, 1835 (nomen nudum)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Curculionidae (Family)

Iphis
 Iphis Meigen, 1800 accepted as Dolichopus Latreille, 1796 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Dolichopodidae (Family)
 Iphis Laporte, 1836 accepted as Lycoreus Candèze, 1857 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Elateridae (Family)
 Iphis Koch, 1835 accepted as Hyletastes Gistl, 1848 · Animalia (Kingdom) > Arthropoda (Phylum) > Arachnida (Class) > Mesostigmata (Order) > Laelapidae (Family)
 Iphis Koch, 1839 accepted as Eviphis Berlese, 1904 · Animalia (Kingdom) > Arthropoda (Phylum) > Arachnida (Class) > Mesostigmata (Order) > Eviphididae (Family)
 Iphis Leach, 1817 accepted as Arcania Leach, 1817 · Animalia (Kingdom) > Arthropoda (Phylum) > Malacostraca (Class) > Decapoda (Order) > Leucosiidae (Family)

Iphisa
     Iphisa Rafinesque, 1815 accepted as Iphisa Rafinesque, 1815 (nomen nudum)· Animalia (Kingdom) > Chordata (Phylum) > Reptilia (Class) > Reptilia (awaiting allocation) (Order) > Reptilia (awaiting allocation) (Family)
     Iphisa Gray, 1852 · Animalia (Kingdom) > Chordata (Phylum) > Reptilia (Class) > Squamata (Order) > Gymnophthalmidae (Family)

Iphiseius
     Iphiseius Berlese, 1920 · Animalia (Kingdom) > Arthropoda (Phylum) > Arachnida (Class) > Mesostigmata (Order) > Phytoseiidae (Family)
     Iphiseius Berlese, 1916 accepted as Iphiseius Berlese, 1920 (nomen nudum)· Animalia (Kingdom) > Arthropoda (Phylum) > Arachnida (Class) > Mesostigmata (Order) > Phytoseiidae (Family)

Iphition
 Iphition Pomel, 1872 † accepted as Iphiteon Bowerbank, 1869 · Animalia (Kingdom) > Porifera (Phylum) > Hexactinellida (Class) > Hexactinosida (Order) > Euretidae (Family)
     Iphition Audouin, 1836 (uncertain)· Animalia (Kingdom) > Porifera (Phylum) > Porifera (awaiting allocation) (Class) > Porifera (awaiting allocation) (Order) > Porifera (awaiting allocation) (Family)

Iphitus
     Iphitus Rafinesque, 1815 accepted as Iphitus Rafinesque, 1815 (nomen nudum)· Animalia (Kingdom) > Arthropoda (Phylum) > Maxillopoda (Class) > Copepoda (awaiting allocation) (Order) > Copepoda incertae sedis (Family)
     Iphitus Jeffreys, 1883 · Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Ptenoglossa (Order) > Nystiellidae (Family)

Iphius
     Iphius Dejean, 1834 accepted as Prioscelis Hope, 1841 (junior homonym)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Tenebrionidae (Family)
 Iphius Schönherr, 1823 accepted as Alceis Billberg, 1820 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Curculionidae (Family)

Iphthimus
     Iphthimus Truqui, 1857 accepted as Iphthinus Dejean, 1834 (misspelling - incorrect subsequent spelling)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Tenebrionidae (Family)
     Iphthimus Gemminger in Gemminger & Harold, 1870 accepted as Iphthinus Dejean, 1834 (unjustified emendation)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Tenebrionidae (Family)

Iphthinus
     Iphthinus Melsheimer, 1846 accepted as Iphthinus Dejean, 1834 (unavailable name)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Tenebrionidae (Family)
     Iphthinus Dejean, 1834 accepted as Mylaris Pallas, 1781 (junior subjective synonym)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Tenebrionidae (Family)

Ipiranga
 Ipiranga Muñoz-Cuevas, 1973 accepted as Uropachylus Mello-Leitão, 1922 · Animalia (Kingdom) > Arthropoda (Phylum) > Arachnida (Class) > Opiliones (Order) > Gonyleptidae (Family)
     Ipiranga Fennah, 1968 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Hemiptera (awaiting allocation) (Family)

Ipites
     Ipites Wisshak, Knaust & Bertling, 2019 † · Animalia (Kingdom) > Trace fossils (Phylum) > (Class) > (Order) > Talpinidae (Family)
     Ipites Karpiński, 1962 † accepted as Ipites Wisshak, Knaust & Bertling, 2019 † (nomen nudum)· Animalia (Kingdom) > Trace fossils (Phylum) > (Class) > (Order) > Talpinidae (Family)

Ipo
 Ipo Persoon, 1807 accepted as Antiaris Leschenault, 1810 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Rosales (Order) > Moraceae (Family)
     Ipo Kirkaldy, 1906 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Cicadellidae (Family)

Ipocerus
     Ipocerus Baker, 1915 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Jassidae (Family)
 Ipocerus Evans, 1934 accepted as Bakeriana Evans, 1954 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Cicadellidae (Family)

Ipoctonus
 Ipoctonus Heine, 1860 accepted as Dendropicos Malherbe, 1849 · Animalia (Kingdom) > Chordata (Phylum) > Aves (Class) > Piciformes (Order) > Picidae (Family)
     Ipoctonus Förster, 1868 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Ichneumonidae (Family)

Ips
     Ips sensu Fabricius, 1777 accepted as Ips sensu Fabricius, 1777 (nomen dubium)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Coleoptera (awaiting allocation) (Family)
     Ips de Geer, 1775 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Curculionidae (Family)

Iquitosa
 Iquitosa Roewer, 1943 accepted as Phalangodus Gervais, 1842 · Animalia (Kingdom) > Arthropoda (Phylum) > Arachnida (Class) > Opiliones (Order) > Cranaidae (Family)
     Iquitosa Fennah, 1945 accepted as Kubilaya Koçak & Kemal, 2010 (junior homonym)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Derbidae (Family)

Ira
     Ira Walker, 1866 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Geometridae (Family)
     Ira Neumoegen, 1890 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Erebidae (Family)

Iracema
     Iracema Triques, 1996 · Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Gymnotiformes (Order) > Rhamphichthyidae (Family)
 Iracema Pérez-Miles, 2000 accepted as Maraca Pérez-Miles, 2005 · Animalia (Kingdom) > Arthropoda (Phylum) > Arachnida (Class) > Araneae (Order) > Theraphosidae (Family)

Iranella
 Iranella Hupé, 1955 † accepted as Neoiranella Özdikmen, 2006 † · Animalia (Kingdom) > Arthropoda (Phylum) > Trilobita (Class) > Asaphida (Order) > Dikelocephalidae (Family)
     Iranella Hupé in Piveteau, 1953 † accepted as Neoiranella Özdikmen, 2006 † (nomen nudum)· Animalia (Kingdom) > Arthropoda (Phylum) > Trilobita (Class) > Asaphida (Order) > Dikelocephalidae (Family)
     Iranella Leven in Leven & Vaziri Mohaddam, 2004 · Chromista (Kingdom) > Retaria (Phylum) > Tubothalamea (Class) > Fusulinida (Order) > Schwagerinidae (Family)
     Iranella Gollestaneh, 1965 ex S. Hosseini, M.A. Conrad & P. Kindler, 2012 † · Plantae (Kingdom) > Chlorophyta (Phylum) > Ulvophyceae (Class) > Dasycladales (Order) > Triploporellaceae (Family)
     Iranella Uvarov, 1922 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Orthoptera (Order) > Dericorythidae (Family)

Irania
 Irania H.-J. Schweitzer, 1977 † accepted as Schweitzeria A.B. Shipunov & D.D. Sokoloff, 2003 † · Plantae (Kingdom) > Tracheophyta (Phylum) > Pinopsida (Class) > Czekanowskiales (Order) > Czekanowskiaceae (Family)
 Irania Douvillé in Morgan, 1904 † accepted as Morgania Cossmann, 1906 † · Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Neotaenioglossa (Order) > Neotaenioglossa (awaiting allocation) (Family)
 Irania E. Hadač & J. Chrtek, 1973 accepted as Fibigia Medikus, 1792 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Brassicales (Order) > Brassicaceae (Family)
     Irania de Filippi, 1862 · Animalia (Kingdom) > Chordata (Phylum) > Aves (Class) > Passeriformes (Order) > Muscicapidae (Family)
 Irania King, 1937 † accepted as Iranoleesia King, 1955 † · Animalia (Kingdom) > Arthropoda (Phylum) > Trilobita (Class) > Ptychopariida (Order) > Asaphiscidae (Family)
     Irania Pandey & Fürsich, 2003 † (uncertain)· Animalia (Kingdom) > Cnidaria (Phylum) > Hexacorallia (Class) > Scleractinia (Order) > Scleractinia (awaiting allocation) (Family)

Iranites
     Iranites Teichert & Kummel in Teichert, Kummel & Sweet, 1973 † (uncertain)· Animalia (Kingdom) > Mollusca (Phylum) > Cephalopoda (Class) > Ceratitida (Order) > Xenodiscidae (Family)
 Iranites Rahaghi, 1976 † accepted as Sirtina Brönnimann & Wirz, 1962 † · Chromista (Kingdom) > Retaria (Phylum) > Globothalamea (Class) > Rotaliida (Order) > Lepidorbitoididae (Family)

Iraniulus
     Iraniulus Lohmander, 1932 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Diplopoda (Class) > Diplopoda (awaiting allocation) (Order) > (Family)
     Iraniulus Attems, 1951 · Animalia (Kingdom) > Arthropoda (Phylum) > Diplopoda (Class) > Julida (Order) > Julidae (Family)

Irenaeus
 Irenaeus Goodsir, 1843 accepted as Anomalocera Templeton, 1837 · Animalia (Kingdom) > Arthropoda (Phylum) > Maxillopoda (Class) > Calanoida (Order) > Pontellidae (Family)
     Irenaeus Agassiz, 1845 accepted as Irenaeus Agassiz, 1845 (nomen nudum)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Coleoptera (awaiting allocation) (Family)
 Irenaeus Latreille, 1829 accepted as Piestus Gravenhorst, 1806 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Staphylinidae (Family)

Irene
 Irene Haeckel, 1879 accepted as Eirene Eschscholtz, 1829 · Animalia (Kingdom) > Cnidaria (Phylum) > Hydrozoa (Class) > Leptothecata (Order) > Eirenidae (Family)
 Irene Boie, 1826 accepted as Irena Horsfield, 1821 · Animalia (Kingdom) > Chordata (Phylum) > Aves (Class) > Passeriformes (Order) > Irenidae (Family)
     Irene Saldaitis & Benedek, 2017 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Noctuidae (Family)
 Irene Theissen & P. Sydow, 1917 accepted as Asteridiella D. McAlpine, 1897 · Fungi (Kingdom) > Ascomycota (Phylum) > Dothideomycetes (Class) > Meliolales (Order) > Meliolaceae (Family)
     Irene (Theissen & Sydow) Ciferri, 1938 · Fungi (Kingdom) > Ascomycota (Phylum) > Dothideomycetes (Class) > Meliolales (Order) > Meliolaceae (Family)

Irenea
     Irenea Donisthorpe, 1938 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Hymenoptera (awaiting allocation) (Family)
 Irenea D.L. Szlachetko, J. Mytnik-Ejsmont, M. Górniak & A. Romowicz, 2006 accepted as Cyrtochilum Kunth in Humboldt, Bonpland & Kunth, 1816 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Asparagales (Order) > Orchidaceae (Family)

Irenella
     Irenella Suessenguth, 1934 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Caryophyllales (Order) > Amaranthaceae (Family)
     Irenella Riley, 1927 (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Aves (Class) > Aves (awaiting allocation) (Order) > Aves (awaiting allocation) (Family)
     Irenella Gude, 1913 (uncertain)· Animalia (Kingdom) > Mollusca (Phylum) > Mollusca (awaiting allocation) (Class) > Mollusca (awaiting allocation) (Order) > Mollusca (awaiting allocation) (Family)

Irenina
 Irenina F.L. Stevens, 1927 accepted as Appendiculella F. von Höhnel, 1919 · Fungi (Kingdom) > Ascomycota (Phylum) > Dothideomycetes (Class) > Meliolales (Order) > Meliolaceae (Family)
     Irenina (F. Stevens) Ciferri, 1938 · Fungi (Kingdom) > Ascomycota (Phylum) > Dothideomycetes (Class) > Meliolales (Order) > Meliolaceae (Family)

Irenopsis
 Irenopsis Götte, 1886 accepted as Eirene Eschscholtz, 1829 · Animalia (Kingdom) > Cnidaria (Phylum) > Hydrozoa (Class) > Leptothecata (Order) > Eirenidae (Family)
     Irenopsis F.L. Stevens, 1927 · Fungi (Kingdom) > Ascomycota (Phylum) > Dothideomycetes (Class) > Meliolales (Order) > Meliolaceae (Family)
     Irenopsis (F. Stevens) Ciferri, 1938 · Fungi (Kingdom) > Ascomycota (Phylum) > Dothideomycetes (Class) > Meliolales (Order) > Meliolaceae (Family)

Iresia
     Iresia Dejean, 1831 accepted as Iresia Dejean in Dejean & Boisduval, 1829 (unavailable name)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Cicindelidae (Family)
     Iresia Dejean in Dejean & Boisduval, 1829 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Cicindelidae (Family)

Iria
 Iria (Persoon) Hedwig, 1806 accepted as Fimbristylis M. Vahl, 1805 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Poales (Order) > Cyperaceae (Family)
     Iria Stål, 1867 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Hemiptera (awaiting allocation) (Family)

Iridea
     Iridea Swainson, 1840 (uncertain)· Animalia (Kingdom) > Mollusca (Phylum) > Mollusca (awaiting allocation) (Class) > Mollusca (awaiting allocation) (Order) > Mollusca (awaiting allocation) (Family)
 Iridea Stackhouse, 1816 accepted as Desmarestia J.V.F. Lamouroux, 1813 · Chromista (Kingdom) > Ochrophyta (Phylum) > Phaeophyceae (Class) > Desmarestiales (Order) > Desmarestiaceae (Family)
 Iridea Bory de St.-Vincent, 1826 accepted as Iridea Bory de St.-Vincent, 1826 · Plantae (Kingdom) > Rhodophyta (Phylum) > Florideophyceae (Class) > Gigartinales (Order) > Gigartinaceae (Family)

Iridipitta
     Iridipitta Bonaparte, 1854, nom. nud. accepted as Pitta Vieillot, 1816 (nomen nudum)· Animalia (Kingdom) > Chordata (Phylum) > Aves (Class) > Passeriformes (Order) > Pittidae (Family)
 Iridipitta Bonaparte, 1854 accepted as Pitta Vieillot, 1816 · Animalia (Kingdom) > Chordata (Phylum) > Aves (Class) > Passeriformes (Order) > Pittidae (Family)

Iridopsis
 Iridopsis Aurivillius, 1899 accepted as Iridana Aurivillius in Seitz, 1920 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Lycaenidae (Family)
     Iridopsis Warren, 1894 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Geometridae (Family)

Iridotaenia
     Iridotaenia Deyrolle, 1865 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Buprestidae (Family)
 Iridotaenia Pongracz, 1935 accepted as Iridotaenia Pongracz, 1935 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Coleoptera (awaiting allocation) (Family)

Iris
     Iris Linnaeus, 1753 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Asparagales (Order) > Iridaceae (Family)
     Iris Staudinger, 1891 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Lycaenidae (Family)
     Iris Saussure, 1869 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Mantodea (Order) > Eremiaphilidae (Family)

Irma
 Irma de Gregorio, 1930 † accepted as Leptodus Kayser in Richthofen, 1883 † · Animalia (Kingdom) > Brachiopoda (Phylum) > Strophomenata (Class) > Productida (Order) > Lyttoniidae (Family)
 Irma Grube, 1878 accepted as Oxydromus Grube, 1855 · Animalia (Kingdom) > Annelida (Phylum) > Polychaeta (Class) > Phyllodocida (Order) > Hesionidae (Family)

Iron
     Iron Eaton, 1883 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Ephemeroptera (Order) > Heptageniidae (Family)
     Iron P. Browne, 1756 (uncertain)· Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Malpighiales (Order) > Ochnaceae (Family)

Irona
 Irona Schiödte & Meinert, 1884 accepted as Mothocya Costa in Hope, 1851 · Animalia (Kingdom) > Arthropoda (Phylum) > Malacostraca (Class) > Isopoda (Order) > Cymothoidae (Family)
     Irona Mabille, 1883 (uncertain)· Animalia (Kingdom) > Mollusca (Phylum) > Mollusca (awaiting allocation) (Class) > Mollusca (awaiting allocation) (Order) > Mollusca (awaiting allocation) (Family)
 Irona Finlay, 1926 accepted as Irus F. C. Schmidt, 1818 · Animalia (Kingdom) > Mollusca (Phylum) > Bivalvia (Class) > Venerida (Order) > Veneridae (Family)

Ironella
     Ironella Krasnov & Starostina, 1970 † · Animalia (Kingdom) > Cnidaria (Phylum) > Hexacorallia (Class) > Scleractinia (Order) > Scleractinia (awaiting allocation) (Family)
     Ironella Cobb, 1920 · Animalia (Kingdom) > Nematoda (Phylum) > Enoplea (Class) > Ironida (Order) > Ironidae (Family)

Irus
     Irus F. C. Schmidt, 1818 · Animalia (Kingdom) > Mollusca (Phylum) > Bivalvia (Class) > Venerida (Order) > Veneridae (Family)
     Irus Oken, 1815 (uncertain)· Animalia (Kingdom) > Mollusca (Phylum) > Mollusca (awaiting allocation) (Class) > Mollusca (awaiting allocation) (Order) > Mollusca (awaiting allocation) (Family)
     Irus Lowe, 1852 (uncertain)· Animalia (Kingdom) > Mollusca (Phylum) > Mollusca (awaiting allocation) (Class) > Mollusca (awaiting allocation) (Order) > Mollusca (awaiting allocation) (Family)

Irvingella
     Irvingella Walcott, 1924 † (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Trilobita (Class) > Trilobita (awaiting allocation) (Order) > Trilobita (awaiting allocation) (Family)
     Irvingella Van Tieghem, 1905 (uncertain)· Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Malpighiales (Order) > Irvingiaceae (Family)
     Irvingella Rusconi, 1948 † · Animalia (Kingdom) > Arthropoda (Phylum) > Trilobita (Class) > Ptychopariida (Order) > Komaspididae (Family)

Irvingia
     Irvingia J.D. Hooker, 1860 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Malpighiales (Order) > Irvingiaceae (Family)
 Irvingia F. von Mueller, 1865 accepted as Polyscias J.R. Forster & J.G.A. Forster, 1775 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Apiales (Order) > Araliaceae (Family)

Irwinia
     Irwinia Cortes, 1967 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Tachinidae (Family)
     Irwinia G.M. Barroso, 1980 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Asterales (Order) > Asteraceae (Family)

Isabelia
     Isabelia Barbosa Rodrigues, 1877 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Asparagales (Order) > Orchidaceae (Family)
 Isabelia J.K. Lentin & G.L. Williams, 1975 † accepted as Isabelidinium J.K. Lentin & G.L. Williams, 1977 † · Chromista (Kingdom) > Miozoa (Phylum) > Dinophyceae (Class) > Peridiniales (Order) > Peridiniaceae (Family)

Isacantha
 Isacantha Simon, 1864 accepted as Isoxya Simon, 1885 · Animalia (Kingdom) > Arthropoda (Phylum) > Arachnida (Class) > Araneae (Order) > Araneidae (Family)
     Isacantha Hope, 1833 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Curculionidae (Family)

Isacis
 Isacis Cope, 1873 † accepted as Isacis Cope, 1873 † · Animalia (Kingdom) > Chordata (Phylum) > Mammalia (Class) > Mammalia (awaiting allocation) (Order) > Mammalia (awaiting allocation) (Family)
 Isacis Diesing, 1861 accepted as Pristionchus Kreis, 1932 · Animalia (Kingdom) > Nematoda (Phylum) > Chromadorea (Class) > Diplogasterida (Order) > Diplogasteridae (Family)

Isadelphus
     Isadelphus Semenov, 1901 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Chrysididae (Family)
     Isadelphus Förster, 1868 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Ichneumonidae (Family)

Isaea
     Isaea Conrad, 1871 (uncertain)· Animalia (Kingdom) > Mollusca (Phylum) > Mollusca (awaiting allocation) (Class) > Mollusca (awaiting allocation) (Order) > Mollusca (awaiting allocation) (Family)
     Isaea Milne Edwards, 1830 · Animalia (Kingdom) > Arthropoda (Phylum) > Malacostraca (Class) > Amphipoda (Order) > Isaeidae (Family)
 Isaea Agassiz, 1846 accepted as Isaea Agassiz, 1846 · Animalia (Kingdom) > Arthropoda (Phylum) > Malacostraca (Class) > Decapoda (Order) > Callianideidae (Family)

Isandra
 Isandra F. von Mueller, 1883 accepted as Symonanthus L. Haegi, 1981 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Solanales (Order) > Solanaceae (Family)
     Isandra R.A. Salisbury, 1866 (uncertain)· Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Liliales (Order) > Liliaceae (Family)

Isandria
     Isandria Warren, 1897 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Lepidoptera (awaiting allocation) (Family)
     Isandria Heinrich, 1970 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Ichneumonidae (Family)

Isanthus
     Isanthus Carlgren, 1938 · Animalia (Kingdom) > Cnidaria (Phylum) > Hexacorallia (Class) > Actiniaria (Order) > Isanthidae (Family)
 Isanthus A. Michaux, 1803 accepted as Trichostema Linnaeus, 1753 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Lamiales (Order) > Lamiaceae (Family)

Isapis
     Isapis Doubleday, 1847 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Lycaenidae (Family)
 Isapis H. Adams & A. Adams, 1854 accepted as Iselica Dall, 1918 · Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Heterostropha (Order) > Amathinidae (Family)

Isarthron
 Isarthron Redtenbacher, 1845 accepted as Isarthron Dejean, 1835 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Cerambycidae (Family)
 Isarthron Dejean, 1835 accepted as Tetropium Kirby, 1837 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Cerambycidae (Family)

Isaster
     Isaster Desor, 1858 † · Animalia (Kingdom) > Echinodermata (Phylum) > Echinoidea (Class) > Spatangoida (Order) > Micrasteridae (Family)
 Isaster Verrill, 1894 accepted as Mediaster Stimpson, 1857 · Animalia (Kingdom) > Echinodermata (Phylum) > Asteroidea (Class) > Valvatida (Order) > Goniasteridae (Family)

Isatis
     Isatis Linnaeus, 1753 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Brassicales (Order) > Brassicaceae (Family)
     Isatis Trouessart, 1885 (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Mammalia (Class) > Mammalia (awaiting allocation) (Order) > Mammalia (awaiting allocation) (Family)

Isaura
 Isaura Joly, 1841 accepted as Cyzicus Audouin, 1837 · Animalia (Kingdom) > Arthropoda (Phylum) > Branchiopoda (Class) > Diplostraca (Order) > Cyzicidae (Family)
 Isaura Commerson ex Poiret in Lamarck, 1813 accepted as Stephanotis Du Petit-Thouars, 1806 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Gentianales (Order) > Apocynaceae (Family)
 Isaura Lamouroux in Bory de Saint-Vincent, 1826 accepted as Isaurus Gray, 1828 · Animalia (Kingdom) > Cnidaria (Phylum) > Hexacorallia (Class) > Zoantharia (Order) > Zoanthidae (Family)
 Isaura Agassiz, 1844 accepted as Isaurus Gray, 1828 · Animalia (Kingdom) > Cnidaria (Phylum) > Hexacorallia (Class) > Zoantharia (Order) > Zoanthidae (Family)
 Isaura Dana, 1848 accepted as Isaura Lamouroux in Bory de Saint-Vincent, 1826 · Animalia (Kingdom) > Cnidaria (Phylum) > Hexacorallia (Class) > Zoantharia (Order) > Zoanthidae (Family)

Isauria
     Isauria Ragonot, 1887 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Pyralidae (Family)
 Isauria Kobelt in Rossmaessler, 1901 accepted as Isaurica Kobelt in Rossmaessler, 1901 · Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Stylommatophora (Order) > Helicidae (Family)

Iscadida
     Iscadida Chevrolat, 1843 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Chrysomelidae (Family)
     Iscadida Dejean, 1836 accepted as Iscadida Chevrolat, 1843 (nomen nudum)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Chrysomelidae (Family)

Ischiochaetus
 Ischiochaetus Parent, 1933 accepted as Ischiochaetus Bickel & Dyte, 1989 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Dolichopodidae (Family)
     Ischiochaetus Bickel & Dyte, 1989 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Dolichopodidae (Family)

Ischiopachys
     Ischiopachys Lacordaire, 1848 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Chrysomelidae (Family)
     Ischiopachys Chevrolat in Dejean, 1836 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Chrysomelidae (Family)

Ischius
 Ischius Candèze, 1857 accepted as Pyrischius Hyslop, 1921 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Elateridae (Family)
     Ischius Wesmael, 1837 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Braconidae (Family)

Ischnanthus
 Ischnanthus (Engler) Van Tieghem, 1895 accepted as Englerina Van Tieghem, 1895 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Santalales (Order) > Loranthaceae (Family)
 Ischnanthus J.J. Roemer & J.A. Schultes, 1817 accepted as Ichnanthus Palisot de Beauvois, 1812 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Poales (Order) > Poaceae (Family)

Ischnaspis
 Ischnaspis Simon, 1892 accepted as Ischnothyreus Simon, 1893 · Animalia (Kingdom) > Arthropoda (Phylum) > Arachnida (Class) > Araneae (Order) > Oonopidae (Family)
     Ischnaspis Douglas, 1887 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Diaspididae (Family)

Ischnia
     Ischnia Jordan, 1903 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Cerambycidae (Family)
     Ischnia Alph. de Candolle ex Meisner, 1840 (uncertain)· Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Lamiales (Order) > Verbenaceae (Family)

Ischnobrotus
     Ischnobrotus Aurivillius, 1912 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Curculionidae (Family)
 Ischnobrotus Hustache, 1936 accepted as Ischnobrotus Aurivillius, 1912 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Curculionidae (Family)

Ischnocerus
 Ischnocerus Schönherr, 1839 accepted as Meconemus Labram & Imhoff, 1838 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Anthribidae (Family)
     Ischnocerus Dejean, 1834 accepted as Meconemus Labram & Imhoff, 1838 (nomen nudum)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Anthribidae (Family)
 Ischnocerus Schoenherr, 1840 accepted as Ischnomerus Schönherr, 1840 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Brentidae (Family)

Ischnocoris
     Ischnocoris Bode, 1953 † (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Hemiptera (awaiting allocation) (Family)
     Ischnocoris Fieber, 1860 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Hemiptera (awaiting allocation) (Family)

Ischnodactylus
 Ischnodactylus Cossmann, 1889 † accepted as Araeodactylus Harris & Burrows, 1891 † · Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Neotaenioglossa (Order) > Neotaenioglossa (awaiting allocation) (Family)
     Ischnodactylus Chevrolat, 1877 accepted as Basides Motschoulsky, 1873 (junior subjective synonym)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Tenebrionidae (Family)
     Ischnodactylus Pelseneer, 1886 † accepted as Ctenocheles Kishinouye, 1926 (junior homonym)· Animalia (Kingdom) > Arthropoda (Phylum) > Malacostraca (Class) > Decapoda (Order) > Ctenochelidae (Family)

Ischnogaster
 Ischnogaster Guérin-Méneville, 1838 accepted as Stenogaster Guérin, 1831 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Vespidae (Family)
     Ischnogaster Kriechbaumer, 1890 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Hymenoptera (awaiting allocation) (Family)

Ischnoglossa
 Ischnoglossa Saussure, 1860 accepted as Leptonycteris Lydekker in Flower & Lydekker, 1891 · Animalia (Kingdom) > Chordata (Phylum) > Mammalia (Class) > Chiroptera (Order) > Phyllostomidae (Family)
     Ischnoglossa Kraatz, 1856 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Staphylinidae (Family)

Ischnognathus
     Ischnognathus Stovall, 1948 † · Animalia (Kingdom) > Chordata (Phylum) > Mammalia (Class) > Creodonta (Order) > Hyaenodontidae (Family)
     Ischnognathus Duméril & Bibron, 1854 (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Reptilia (Class) > Squamata (Order) > Colubridae (Family)

Ischnolepis
     Ischnolepis Haughton, 1934 (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Pisces (awaiting allocation) (Class) > Pisces (awaiting allocation) (Order) > Pisces (awaiting allocation) (Family)
     Ischnolepis H. Jumelle & H. Perrier de la Bâthie, 1909 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Gentianales (Order) > Apocynaceae (Family)

Ischnomerus
     Ischnomerus Schönherr, 1842 accepted as Ischnomerus Schönherr, 1840 (nomen nudum)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Brentidae (Family)
 Ischnomerus Schönherr, 1840 accepted as Aulacoderes Chevrolat, 1839 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Brentidae (Family)
     Ischnomerus Labram & Imhoff, 1838 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Brentidae (Family)

Ischnophanes
     Ischnophanes Meyrick, 1891 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Coleophoridae (Family)
 Ischnophanes Turner, 1936 accepted as Ischnomorpha Turner, 1937 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Oecophoridae (Family)

Ischnopoda
 Ischnopoda Blackwelder, 1952 accepted as Atheta Thomson, 1858 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Staphylinidae (Family)
     Ischnopoda Grandidier, 1869 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Orthoptera (Order) > Orthoptera (awaiting allocation) (Family)
     Ischnopoda Stephens, 1835 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Staphylinidae (Family)

Ischnopsis
     Ischnopsis Walsingham, 1881 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Elachistidae (Family)
     Ischnopsis Ashmead, 1896 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Eupelmidae (Family)

Ischnoptera
 Ischnoptera Turner, 1941 accepted as Elaphromorpha Turner, 1936 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Oecophoridae (Family)
 Ischnoptera Brunner, 1891 accepted as Phanischnoptera Kirby, 1906 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Orthoptera (Order) > Tettigoniidae (Family)
 Ischnoptera Fox, 1917 accepted as Parcoblatta Hebard, 1917 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Blattodea (Order) > Ectobiidae (Family)
     Ischnoptera Burmeister, 1838 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Blattodea (Order) > Ectobiidae (Family)
     Ischnoptera Béthoux & Nel, 2004 † accepted as Paleoischnoptera Schubnel, Roberts, Roques, Garrouste, Desutter-Grandcolas & Nel, 2020 † (junior homonym)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Archaeorthoptera incertae sedis (Order) > (Family)

Ischnopteryx
 Ischnopteryx Agassiz, 1846 accepted as Ischnopteris Hübner, 1823 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Geometridae (Family)
     Ischnopteryx Enderlein, 1900 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Psocoptera (Order) > Psocoptera (awaiting allocation) (Family)

Ischnopus
     Ischnopus Marshall in Mantero, 1904 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Braconidae (Family)
     Ischnopus Kriechbaumer, 1898 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Ichneumonidae (Family)
 Ischnopus Amyot, 1846 accepted as Ischnopus Amyot, 1846 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Hemiptera (awaiting allocation) (Family)
 Ischnopus Faust, 1894 accepted as Clarkanthus Alonso-Zarazaga & Lyal, 1999 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Curculionidae (Family)

Ischnoradsia
 Ischnoradsia Shuttleworth, 1853 accepted as Ischnochiton Gray, 1847 · Animalia (Kingdom) > Mollusca (Phylum) > Polyplacophora (Class) > Ischnochitonida (Order) > Ischnochitonidae (Family)
     Ischnoradsia Dall, 1879 (uncertain)· Animalia (Kingdom) > Mollusca (Phylum) > Mollusca (awaiting allocation) (Class) > Mollusca (awaiting allocation) (Order) > Mollusca (awaiting allocation) (Family)

Ischnoscelis
 Ischnoscelis Agassiz, 1845 accepted as Geranospiza Kaup, 1847 · Animalia (Kingdom) > Chordata (Phylum) > Aves (Class) > Accipitriformes (Order) > Accipitridae (Family)
     Ischnoscelis Burmeister, 1842 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Scarabaeidae (Family)
     Ischnoscelis Reuter, 1880 accepted as Ischnoscelicoris Reuter in Puton, 1886 (junior homonym)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Miridae (Family)

Ischnosoma
 Ischnosoma Agassiz in Spix & Agassiz, 1829 accepted as Osteoglossum Cuvier, 1829 · Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Osteoglossiformes (Order) > Osteoglossidae (Family)
     Ischnosoma Wallengren, 1894 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Odonata (Order) > Odonata (awaiting allocation) (Family)
     Ischnosoma Stephens, 1832 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Staphylinidae (Family)
 Ischnosoma G.O. Sars, 1866 accepted as Ischnomesus Richardson, 1908 · Animalia (Kingdom) > Arthropoda (Phylum) > Malacostraca (Class) > Isopoda (Order) > Ischnomesidae (Family)
     Ischnosoma Stephens, 1829 accepted as Ischnosoma Stephens, 1829 (nomen nudum)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Staphylinidae (Family)

Ischnurus
 Ischnurus I.B. Balfour, 1883 accepted as Lepturus R. Brown, 1810 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Poales (Order) > Poaceae (Family)
 Ischnurus Koch, 1837 accepted as Liocheles Sundevall, 1833 · Animalia (Kingdom) > Arthropoda (Phylum) > Arachnida (Class) > Scorpiones (Order) > Hormuridae (Family)

Ischyrodon
     Ischyrodon Merian, 1838 (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Reptilia (Class) > Reptilia (awaiting allocation) (Order) > Reptilia (awaiting allocation) (Family)
     Ischyrodon Müller Hal., 1875 · Plantae (Kingdom) > Bryophyta (Phylum) > Bryopsida (Class) > Isobryales (Order) > Fabroniaceae (Family)

Ischyrosonyx
     Ischyrosonyx Chevrolat in Dejean, 1836 accepted as Ischyrosonyx Sturm, 1843 (nomen nudum)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Chrysomelidae (Family)
 Ischyrosonyx Sturm, 1843 accepted as Eurypedus Gistel, 1834 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Chrysomelidae (Family)

Ischyrus
     Ischyrus Lacordaire, 1842 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Erotylidae (Family)
 Ischyrus Faldermann, 1837 accepted as Megischyrus Crotch, 1873 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Erotylidae (Family)
 Ischyrus Chevrolat in Dejean, 1836 accepted as Megischyrus Crotch, 1873 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Erotylidae (Family)

Ishpella
     Ishpella Petrunina in Petrunina, Sennikov, Ermikov, Zeifert, Krivchikov & Puzyrev, 1984 † (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Trilobita (Class) > Trilobita (awaiting allocation) (Order) > Trilobita (awaiting allocation) (Family)
     Ishpella Petrunina, 1990 † · Animalia (Kingdom) > Arthropoda (Phylum) > Trilobita (Class) > Trilobita (awaiting allocation) (Order) > Trilobita (awaiting allocation) (Family)

Isia
     Isia D.L. Hawksworth & C. Manoharachary, 1978 · Fungi (Kingdom) > Ascomycota (Phylum) > Sordariomycetes (Class) > Sordariomycetes incertae sedis (Order) > Sordariomycetes incertae sedis (Family)
     Isia Walker, 1856 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Erebidae (Family)

Isias
     Isias De Notaris, 1844 (uncertain)· Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Asparagales (Order) > Orchidaceae (Family)
     Isias Boeck, 1865 · Animalia (Kingdom) > Arthropoda (Phylum) > Maxillopoda (Class) > Calanoida (Order) > Centropagidae (Family)

Ismarus
     Ismarus Haag-Rutenberg, 1878 accepted as Simarus Borchmann, 1909 (junior homonym)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Tenebrionidae (Family)
     Ismarus Haliday, 1835 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Ismaridae (Family)

Ismaya
 Ismaya Colless, 1994 accepted as Johnismaya Colless, 1994 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Rhinophoridae (Family)
     Ismaya Boucek, 1988 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Hymenoptera (awaiting allocation) (Family)

Ismene
     Ismene Swainson, 1820 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Hesperiidae (Family)
     Ismene Nickerl, 1846 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Papilionidae (Family)
     Ismene Stephens, 1834 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Yponomeutidae (Family)
     Ismene Bogachev, 1936 † (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Pisces (awaiting allocation) (Class) > Pisces (awaiting allocation) (Order) > Pisces (awaiting allocation) (Family)
 Ismene Savigny, 1816 accepted as Bibasis Moore, 1881 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Hesperiidae (Family)
     Ismene R.A. Salisbury ex Herbert, 1821 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Asparagales (Order) > Amaryllidaceae (Family)

Ismenia
 Ismenia Pruvot, 1891 accepted as Ichthyomenia Pilsbry in Tryon & Pilsbry, 1898 · Animalia (Kingdom) > Mollusca (Phylum) > Aplacophora (Class) > Pholidoskepia (Order) > Dondersiidae (Family)
     Ismenia King, 1850 † · Animalia (Kingdom) > Brachiopoda (Phylum) > Rhynchonellata (Class) > Terebratulida (Order) > Dallinidae (Family)
     Ismenia Robineau-Desvoidy, 1863 accepted as Ismenia Robineau-Desvoidy, 1863 (junior homonym)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Tachinidae (Family)

Isnardia
 Isnardia Linnaeus, 1753 accepted as Ludwigia Linnaeus, 1753 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Myrtales (Order) > Onagraceae (Family)
     Isnardia Borrello, 1967 † (uncertain)· Animalia (Kingdom) > Trace fossils (Phylum) > (Class) > (Order) > (Family)

Isocardia
     Isocardia Barrande, 1881 † (uncertain)· Animalia (Kingdom) > Mollusca (Phylum) > Bivalvia (Class) > Praecardioida (Order) > Antipleuridae (Family)
 Isocardia Lamarck, 1799 accepted as Glossus Poli, 1795 · Animalia (Kingdom) > Mollusca (Phylum) > Bivalvia (Class) > Venerida (Order) > Glossidae (Family)

Isocardium
 Isocardium Froriep, 1806 accepted as Glossus Poli, 1795 · Animalia (Kingdom) > Mollusca (Phylum) > Bivalvia (Class) > Venerida (Order) > Glossidae (Family)
     Isocardium Link, 1807 (uncertain)· Animalia (Kingdom) > Mollusca (Phylum) > Mollusca (awaiting allocation) (Class) > Mollusca (awaiting allocation) (Order) > Mollusca (awaiting allocation) (Family)

Isocarpha
 Isocarpha Lessing, 1830 accepted as · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Asterales (Order) > Asteraceae (Family)
     Isocarpha R. Brown, 1817 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Asterales (Order) > Asteraceae (Family)

Isocasnonia
     Isocasnonia Csiki, 1932 accepted as Isocasnonia Csiki, 1932 (nomen nudum)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Coleoptera (awaiting allocation) (Family)
 Isocasnonia Liebke, 1938 accepted as Colliuris de Geer, 1774 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Carabidae (Family)

Isocerus
     Isocerus Dejean, 1821 accepted as Neoisocerus Bouchard, Lawrence, Davies & Newton, 2005 (junior homonym)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Tenebrionidae (Family)
     Isocerus Illiger, 1802 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Cerambycidae (Family)
     Isocerus Laporte, 1840 accepted as Isocerus Dejean, 1821 (unavailable name)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Tenebrionidae (Family)
     Isocerus Latreille, 1829 accepted as Isocerus Dejean, 1821 (unavailable name)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Tenebrionidae (Family)

Isochaeta
 Isochaeta Giesbrecht, 1889 accepted as Lucicutia Giesbrecht, 1898 · Animalia (Kingdom) > Arthropoda (Phylum) > Maxillopoda (Class) > Calanoida (Order) > Lucicutiidae (Family)
 Isochaeta Pointner, 1911 accepted as Isochaetides Hrabĕ, 1966 · Animalia (Kingdom) > Annelida (Phylum) > Clitellata (Class) > Haplotaxida (Order) > Naididae (Family)

Isochirus
     Isochirus Desmarest, 1823 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Crustacea (awaiting allocation) (Class) > Crustacea (awaiting allocation) (Order) > Crustacea (awaiting allocation) (Family)
 Isochirus Reitter, 1892 accepted as Turanella Semenov, 1905 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Scarabaeidae (Family)

Isochorema
     Isochorema Schmid, 1989 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Trichoptera (Order) > Hydrobiosidae (Family)
     Isochorema Wichard, 2013 † · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Trichoptera (Order) > Hydrobiosidae (Family)

Isocladus
     Isocladus S.O. Lindberg, 1862 (uncertain)· Plantae (Kingdom) > Bryophyta (Phylum) > Sphagnopsida (Class) > Sphagnales (Order) > Sphagnaceae (Family)
     Isocladus Miers, 1876 · Animalia (Kingdom) > Arthropoda (Phylum) > Malacostraca (Class) > Isopoda (Order) > Sphaeromatidae (Family)

Isocolus
     Isocolus Förster, 1869 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Hymenoptera (awaiting allocation) (Family)
     Isocolus Zittel, 1885 † · Animalia (Kingdom) > Arthropoda (Phylum) > Trilobita (Class) > Asaphida (Order) > Asaphida (awaiting allocation) (Family)

Isocordia
 Isocordia Sacco, 1901 accepted as Glossus Poli, 1795 · Animalia (Kingdom) > Mollusca (Phylum) > Bivalvia (Class) > Venerida (Order) > Glossidae (Family)
     Isocordia Bruguière, 1792 (uncertain)· Animalia (Kingdom) > Mollusca (Phylum) > Mollusca (awaiting allocation) (Class) > Mollusca (awaiting allocation) (Order) > Mollusca (awaiting allocation) (Family)

Isocrinites
     Isocrinites Phillips, 1841 † (uncertain)· Animalia (Kingdom) > Echinodermata (Phylum) > Echinodermata (awaiting allocation) (Class) > Echinodermata (awaiting allocation) (Order) > Echinodermata (awaiting allocation) (Family)
     Isocrinites Meyer, 1835 accepted as Isocrinites Meyer, 1835 (nomen nudum)· Animalia (Kingdom) > Echinodermata (Phylum) > Echinodermata (awaiting allocation) (Class) > Echinodermata (awaiting allocation) (Order) > Echinodermata (awaiting allocation) (Family)

Isocrinus
     Isocrinus Meyer, 1835 accepted as Isocrinus von Meyer in Agassiz, 1836 † (nomen nudum)· Animalia (Kingdom) > Echinodermata (Phylum) > Crinoidea (Class) > Isocrinida (Order) > Isocrinidae (Family)
     Isocrinus von Meyer in Agassiz, 1836 † · Animalia (Kingdom) > Echinodermata (Phylum) > Crinoidea (Class) > Isocrinida (Order) > Isocrinidae (Family)
     Isocrinus Phillips, 1841 † (uncertain)· Animalia (Kingdom) > Echinodermata (Phylum) > Echinodermata (awaiting allocation) (Class) > Echinodermata (awaiting allocation) (Order) > Echinodermata (awaiting allocation) (Family)

Isocyclidium
     Isocyclidium Esteban, Finlay & Embley, 1993, nom. nud. accepted as Isocyclidium Esteban, Finlay & Embley, 1993, nom. nud. (nomen nudum)· Chromista (Kingdom) > Ciliophora (Phylum) > Oligohymenophorea (Class) > Scuticociliatida (Order) > Cyclidiidae (Family)
     Isocyclidium Esteban, Finlay & Embley, 1993 · Chromista (Kingdom) > Ciliophora (Phylum) > Oligohymenophorea (Class) > Scuticociliatida (Order) > Cyclidiidae (Family)

Isodactylus
 Isodactylus Dal Piaz, 1927 † accepted as Isodactylella Strand, 1943 † · Animalia (Kingdom) > Chordata (Phylum) > Mammalia (Class) > Mammalia (awaiting allocation) (Order) > Mammalia (awaiting allocation) (Family)
     Isodactylus Gray, 1845 (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Reptilia (Class) > Reptilia (awaiting allocation) (Order) > Reptilia (awaiting allocation) (Family)
     Isodactylus Hedges, Duellman & Heinicke, 2008 accepted as Niceforonia Goin & Cochran, 1963 (junior homonym)· Animalia (Kingdom) > Chordata (Phylum) > Amphibia (Class) > Anura (Order) > Strabomantidae (Family)

Isodictya
     Isodictya Bowerbank, 1864 · Animalia (Kingdom) > Porifera (Phylum) > Demospongea (Class) > Poecilosclerida (Order) > Isodictyidae (Family)
     Isodictya Bowerbank in MacAndrew, 1861 accepted as Isodictya Bowerbank, 1864 (nomen nudum)· Animalia (Kingdom) > Porifera (Phylum) > Demospongea (Class) > Poecilosclerida (Order) > Isodictyidae (Family)

Isodon
 Isodon Douvillé, 1912 † accepted as Isodon Douvillé, 1912 † · Animalia (Kingdom) > Mollusca (Phylum) > Mollusca (awaiting allocation) (Class) > Mollusca (awaiting allocation) (Order) > Mollusca (awaiting allocation) (Family)
     Isodon Hope, 1837 accepted as Trissodon Burmeister, 1847 (junior homonym)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Scarabaeidae (Family)
 Isodon Say, 1822 accepted as Isoodon Geoffroy in Desmarest, 1817 · Animalia (Kingdom) > Chordata (Phylum) > Mammalia (Class) > Peramelemorphia (Order) > Peramelidae (Family)
 Isodon Agassiz, 1846 accepted as Isoodon Geoffroy in Desmarest, 1817 · Animalia (Kingdom) > Chordata (Phylum) > Mammalia (Class) > Peramelemorphia (Order) > Peramelidae (Family)
     Isodon (Schrader ex Bentham) Spach, 1840 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Lamiales (Order) > Lamiaceae (Family)

Isodonta
 Isodonta Cameron, 1910 accepted as Isodontia Patton, 1880 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Sphecidae (Family)
     Isodonta Buvignier, 1851 † (uncertain)· Animalia (Kingdom) > Mollusca (Phylum) > Mollusca (awaiting allocation) (Class) > Mollusca (awaiting allocation) (Order) > Mollusca (awaiting allocation) (Family)

Isodontiaphila
 Isodontiaphila Bohart, 1941 accepted as Isodontiaphila Bohart, 1941 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Coleoptera (awaiting allocation) (Family)
 Isodontiaphila Pierce, 1918 accepted as Paraxenos Saunders, 1872 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Strepsiptera (Order) > Stylopidae (Family)

Isodus
     Isodus Heckel in Russegger, 1849 (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Pisces (awaiting allocation) (Class) > Pisces (awaiting allocation) (Order) > Pisces (awaiting allocation) (Family)
     Isodus M'Coy, 1848 (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Pisces (awaiting allocation) (Class) > Pisces (awaiting allocation) (Order) > Pisces (awaiting allocation) (Family)

Isoentomon
     Isoentomon Tuxen, 1975 · Animalia (Kingdom) > Arthropoda (Phylum) > Protura (Class) > Eosentomata (Order) > Eosentomidae (Family)
     Isoentomon Nosek, 1975 accepted as Isoentomon Nosek, 1978 (nomen nudum)· Animalia (Kingdom) > Arthropoda (Phylum) > Protura (Class) > Eosentomata (Order) > Eosentomidae (Family)
     Isoentomon Nosek, 1978 · Animalia (Kingdom) > Arthropoda (Phylum) > Protura (Class) > Eosentomata (Order) > Eosentomidae (Family)

Isoetopsis
 Isoetopsis Saporta, 1888 † accepted as Isoetites G. Graf zu Münster, 1842 † · Plantae (Kingdom) > Tracheophyta (Phylum) > Lycopodiopsida (Class) > Isoetales (Order) > Isoetaceae (Family)
     Isoetopsis Turczaninow, 1851 accepted as Minuria A.P. de Candolle, 1836 (junior subjective synonym)· Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Asterales (Order) > Asteraceae (Family)

Isoglossa
     Isoglossa Oersted, 1854 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Lamiales (Order) > Acanthaceae (Family)
     Isoglossa Coquillett, 1895 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Tachinidae (Family)
 Isoglossa Casey, 1893 accepted as Rheobioma Casey, 1906 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Staphylinidae (Family)

Isognathus
 Isognathus Kolbe, 1888 accepted as Bolbocranius Kolbe, 1897 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Brentidae (Family)
     Isognathus Felder, 1862 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Sphingidae (Family)

Isognomon
     Isognomon Lightfoot, 1786 · Animalia (Kingdom) > Mollusca (Phylum) > Bivalvia (Class) > Pterioida (Order) > Isognomonidae (Family)
 Isognomon Link, 1807 accepted as Isognomon Lightfoot, 1786 · Animalia (Kingdom) > Mollusca (Phylum) > Bivalvia (Class) > Pterioida (Order) > Isognomonidae (Family)

Isogramma
     Isogramma King, 1955 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Lepidoptera (awaiting allocation) (Family)
     Isogramma Rothschild & Jordan, 1903 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Sphingidae (Family)
     Isogramma Meek & Worthen, 1873 † · Animalia (Kingdom) > Brachiopoda (Phylum) > Rhynchonellata (Class) > Spiriferida (Order) > Articulata (awaiting allocation) (Family)

Isolampas
     Isolampas Lambert in Chautard, 1905 † accepted as Isolampas Lambert in Chautard, 1905 † (nomen nudum)· Animalia (Kingdom) > Echinodermata (Phylum) > Echinodermata (awaiting allocation) (Class) > Echinodermata (awaiting allocation) (Order) > Echinodermata (awaiting allocation) (Family)
 Isolampas Lambert, 1906 † accepted as Echinolampas Gray, 1825 · Animalia (Kingdom) > Echinodermata (Phylum) > Echinoidea (Class) > Cassiduloida (Order) > Echinolampadidae (Family)

Isoleda
     Isoleda Ryckholt, 1854 † (uncertain)· Animalia (Kingdom) > Mollusca (Phylum) > Bivalvia (Class) > Bivalvia (awaiting allocation) (Order) > Bivalvia (awaiting allocation) (Family)
 Isoleda Rollier, 1923 † accepted as Rollieria Cossmann, 1920 † · Animalia (Kingdom) > Mollusca (Phylum) > Bivalvia (Class) > Nuculida (Order) > Nuculida (awaiting allocation) (Family)

Isoloba
     Isoloba Warren, 1893 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Geometridae (Family)
     Isoloba Rafinesque, 1838 (uncertain)· Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Lamiales (Order) > Lentibulariaceae (Family)

Isoloma
 Isoloma J. Smith, 1841 accepted as Lindsaea Dryander ex Smith, 1793 · Plantae (Kingdom) > Tracheophyta (Phylum) > Polypodiopsida (Class) > Polypodiales (Order) > Lindsaeaceae (Family)
 Isoloma Decaisne, 1848 accepted as Kohleria Regel, 1847 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Lamiales (Order) > Gesneriaceae (Family)

Isolus
     Isolus Rafinesque, 1815 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Crustacea (awaiting allocation) (Class) > Crustacea (awaiting allocation) (Order) > Crustacea (awaiting allocation) (Family)
     Isolus Rafinesque, 1814 accepted as Isolus Rafinesque, 1814 (nomen nudum)· Animalia (Kingdom) > Arthropoda (Phylum) > Crustacea (awaiting allocation) (Class) > Crustacea (awaiting allocation) (Order) > Crustacea (awaiting allocation) (Family)

Isomera
     Isomera Robineau-Desvoidy, 1851 accepted as Isomera Robineau-Desvoidy, 1851 (nomen dubium)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Tachinidae (Family)
     Isomera Fairmaire & Coquerel, 1866 accepted as Isomira Mulsant, 1856 (misspelling - incorrect subsequent spelling)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Tenebrionidae (Family)

Isomeria
     Isomeria Albers, 1850 · Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Stylommatophora (Order) > Labyrinthidae (Family)
     Isomeria Chevallier · Chromista (Kingdom) > Bacillariophyta (Phylum) > Bacillariophyceae (Class) > (Order) > Bacillariophyceae incertae sedis (Family)

Isomerinthus
 Isomerinthus Schoenherr, 1842 accepted as Sphaeropterus Guérin-Méneville, 1838 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Curculionidae (Family)
     Isomerinthus Desmarest in Vaillant, 1842 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Curculionidae (Family)

Isomeris
 Isomeris Nuttall in J. Torrey & A. Gray, 1838 accepted as Cleome Linnaeus, 1753 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Brassicales (Order) > Cleomaceae (Family)
     Isomeris Townes, 1969 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Ichneumonidae (Family)

Isomerus
 Isomerus Gistel, 1834 accepted as Choleva Latreille, 1796 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Leiodidae (Family)
 Isomerus Motschoulsky, 1860 accepted as Terminasiania Alonso-Zarazaga & Lyal, 1999 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Curculionidae (Family)

Isomita
     Isomita K.M. Diesing, 1848 (uncertain)· Protozoa (Kingdom) > Sarcomastigota (awaiting allocation) (Phylum) > (Class) > (Order) > Flagellata (awaiting allocation) (Family)
     Isomita T. Cavalier-Smith · Protozoa (Kingdom) > Protozoa incertae sedis (Phylum) > (Class) > (Order) > (Family)

Isomma
     Isomma Selys, 1892 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Odonata (Order) > Gomphidae (Family)
     Isomma Jordan, 1927 † (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Pisces (awaiting allocation) (Class) > Pisces (awaiting allocation) (Order) > Pisces (awaiting allocation) (Family)

Isomyllocerus
 Isomyllocerus Voss, 1937 accepted as Myllocerus Schönherr, 1823 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Curculionidae (Family)
 Isomyllocerus Marshall, 1954 accepted as Myllocerus Schönherr, 1823 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Curculionidae (Family)

Isonema
     Isonema Meek & Worthen, 1865 † · Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Trochida (Order) > Anomphalidae (Family)
     Isonema R. Brown, 1810 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Gentianales (Order) > Apocynaceae (Family)
 Isonema Cassini, 1817 accepted as · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Asterales (Order) > Asteraceae (Family)
 Isonema Maas, 1906 accepted as Arctapodema Dall, 1907 · Animalia (Kingdom) > Cnidaria (Phylum) > Hydrozoa (Class) > Trachylina (Order) > Rhopalonematidae (Family)
 Isonema Hall, 1891 accepted as Littorina Férussac, 1822 · Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Littorinimorpha (Order) > Littorinidae (Family)
     Isonema Schuster, Goldstein & Hershenov, 1968 accepted as Metadiplonema Tashyreva, Simpson, Horák & Lukeš in Tashyreva et al., 2022 (junior homonym)· Protozoa (Kingdom) > Euglenozoa (Phylum) > Diplonemea (Class) > Diplonemida (Order) > Diplonemidae (Family)

Isonotus
     Isonotus Dahlbom, 1842 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Hymenoptera (awaiting allocation) (Family)
     Isonotus Houlbert, 1934 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Dytiscidae (Family)
     Isonotus Lepeletier & Serville, 1828 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Coleoptera (awaiting allocation) (Family)
     Isonotus Perty, 1832 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Coleoptera (awaiting allocation) (Family)
 Isonotus Guignot, 1936 accepted as Hydaticus Leach, 1817 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Dytiscidae (Family)

Isopetalum
 Isopetalum Sweet, 1822 accepted as Pelargonium L'Héritier ex W. Aiton, 1789 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Geraniales (Order) > Geraniaceae (Family)
 Isopetalum (A.P. de Candolle) Ecklon & Zeyher, 1835 accepted as · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Geraniales (Order) > Geraniaceae (Family)
     Isopetalum Lambert, 1911 † · Animalia (Kingdom) > Echinodermata (Phylum) > Echinoidea (Class) > Spatangoida (Order) > Spatangoida (awaiting allocation) (Family)

Isophyllum
 Isophyllum Spach, 1836 accepted as · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Malpighiales (Order) > Clusiaceae (Family)
     Isophyllum G.F. Hoffmann, 1814 (uncertain)· Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Apiales (Order) > Apiaceae (Family)

Isoplastus
     Isoplastus Skuse, 1889 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Chironomidae (Family)
     Isoplastus Horn, 1880 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Leiodidae (Family)

Isoplata
     Isoplata Förster, 1856 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Hymenoptera (awaiting allocation) (Family)
 Isoplata Girault, 1913 accepted as Gastrancistrus Westwood, 1833 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Pteromalidae (Family)

Isopleurus
 Isopleurus Kirby, 1837 accepted as Amara Bonelli, 1810 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Carabidae (Family)
     Isopleurus Meek, 1864 (uncertain)· Animalia (Kingdom) > Mollusca (Phylum) > Mollusca (awaiting allocation) (Class) > Mollusca (awaiting allocation) (Order) > Mollusca (awaiting allocation) (Family)

Isopogon
     Isopogon Loew, 1847 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Asilidae (Family)
     Isopogon R. Brown ex J. Knight, 1809 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Proteales (Order) > Proteaceae (Family)

Isoprosopaea
 Isoprosopaea Townsend, 1943 accepted as Chaetexorista Brauer & Bergenstamm, 1895 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Tachinidae (Family)
     Isoprosopaea Villeneuve, 1938 accepted as Isoprosopaea Townsend, 1943 (nomen nudum)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Tachinidae (Family)

Isoptera
 Isoptera Okamura, 1901 accepted as · Plantae (Kingdom) > Rhodophyta (Phylum) > Florideophyceae (Class) > Ceramiales (Order) > Rhodomelaceae (Family)
 Isoptera Brullé, 1832 accepted as Blattodea · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Isoptera (Order) > (Family)
 Isoptera Scheffer ex Burck, 1887 accepted as Shorea Roxburgh ex C.F. Gaertner, 1805 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Malvales (Order) > Dipterocarpaceae (Family)

Isopteryx
     Isopteryx Klotzsch, 1854 (uncertain)· Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Cucurbitales (Order) > Begoniaceae (Family)
     Isopteryx Guenée, 1854 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Lepidoptera (awaiting allocation) (Family)
 Isopteryx Pictet, 1841 accepted as Chloroperla Newman, 1836 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Plecoptera (Order) > Chloroperlidae (Family)

Isopus
 Isopus Faust, 1898 accepted as Homoeopus Berg, 1899 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Curculionidae (Family)
     Isopus Montrouzier, 1860 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Tenebrionidae (Family)
 Isopus Taczanowski, 1872 accepted as Tapinillus Simon, 1898 · Animalia (Kingdom) > Arthropoda (Phylum) > Arachnida (Class) > Araneae (Order) > Oxyopidae (Family)

Isopyrum
 Isopyrum Adanson, 1763 accepted as · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Ranunculales (Order) > Ranunculaceae (Family)
     Isopyrum Linnaeus, 1753 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Ranunculales (Order) > Ranunculaceae (Family)

Isora
     Isora P. Miller, 1754 (uncertain)· Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Malvales (Order) > Malvaceae (Family)
     Isora Mulsant, 1850 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Coccinellidae (Family)

Isorhynchus
     Isorhynchus Schönherr, 1833 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Curculionidae (Family)
 Isorhynchus King, 1850 † accepted as Equirostra Cooper & Muir-Wood, 1951 † · Animalia (Kingdom) > Brachiopoda (Phylum) > Rhynchonellata (Class) > Pentamerida (Order) > Porambonitidae (Family)

Isorrhinus
 Isorrhinus Gemminger & Harold, 1871 accepted as Isorhinus Capiomont, 1867 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Curculionidae (Family)
 Isorrhinus Champion, 1902 accepted as Isorhinus Capiomont, 1867 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Curculionidae (Family)

Isosaphanus
     Isosaphanus Hintz, 1913 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Coleoptera (awaiting allocation) (Family)
     Isosaphanus Lepesme & Breuning, 1956 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Cerambycidae (Family)

Isosoma
 Isosoma Ménétriés, 1832 accepted as Phyllocerus Lepeletier & Serville, 1825 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Plastoceridae (Family)
     Isosoma Billberg, 1820 accepted as Phygasia Dejean, 1836 (nomen oblitum)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Chrysomelidae (Family)
 Isosoma Walker, 1832 accepted as Tetramesa Walker, 1848 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Eurytomidae (Family)
 Isosoma M. Svrček, 1989 accepted as Cudoniella P.A. Saccardo, 1889 · Fungi (Kingdom) > Ascomycota (Phylum) > Leotiomycetes (Class) > Helotiales (Order) > Helotiaceae (Family)

Isotarsus
 Isotarsus LaFerté-Sénectère, 1851 accepted as Craspedophorus Hope, 1838 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Carabidae (Family)
 Isotarsus Chaudoir, 1878 accepted as Psecadius Alluaud, 1911 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Carabidae (Family)

Isothea
     Isothea E.M. Fries, 1849 · Fungi (Kingdom) > Ascomycota (Phylum) > Sordariomycetes (Class) > Phyllachorales (Order) > Phyllachoraceae (Family)
     Isothea Scudder, 1893 † · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Attelabidae (Family)

Isotima
     Isotima Brunner von Wattenwyl, 1878 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Orthoptera (Order) > Orthoptera (awaiting allocation) (Family)
     Isotima Förster, 1868 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Ichneumonidae (Family)

Isotoma
     Isotoma Bourlet, 1839 · Animalia (Kingdom) > Arthropoda (Phylum) > Collembola (Class) > Entomobryomorpha (Order) > Isotomidae (Family)
     Isotoma Dejean, 1834 accepted as Isotoma Blanchard, 1845 (nomen nudum)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Tenebrionidae (Family)
     Isotoma (R. Brown) J. Lindley, 1826 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Asterales (Order) > Campanulaceae (Family)
     Isotoma Blanchard, 1845 accepted as Isocera Borchmann, 1909 (junior homonym)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Tenebrionidae (Family)

Isotomiella
     Isotomiella Deharveng & Fjellberg, 1993 · Animalia (Kingdom) > Arthropoda (Phylum) > Collembola (Class) > Entomobryomorpha (Order) > Isotomidae (Family)
     Isotomiella Bagnall, 1939 · Animalia (Kingdom) > Arthropoda (Phylum) > Collembola (Class) > Entomobryomorpha (Order) > Isotomidae (Family)

Isozoanthus
     Isozoanthus Carlgren in Chun, 1903 · Animalia (Kingdom) > Cnidaria (Phylum) > Hexacorallia (Class) > Zoantharia (Order) > Parazoanthidae (Family)
 Isozoanthus Carlgren in Nordgaard, 1905 accepted as Isozoanthus Carlgren in Chun, 1903 · Animalia (Kingdom) > Cnidaria (Phylum) > Hexacorallia (Class) > Zoantharia (Order) > Parazoanthidae (Family)

Ispida
 Ispida Möhring, 1758 accepted as Ispida Möhring, 1758 · Animalia (Kingdom) > Chordata (Phylum) > Aves (Class) > Aves (awaiting allocation) (Order) > Aves (awaiting allocation) (Family)
     Ispida Brisson, 1760 (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Aves (Class) > Aves (awaiting allocation) (Order) > Aves (awaiting allocation) (Family)

Issa
     Issa Walker, 1867 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Lepidoptera (awaiting allocation) (Family)
 Issa Bergh, 1881 accepted as Colga Bergh, 1880 · Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Nudibranchia (Order) > Polyceridae (Family)

Issedonia
     Issedonia Emelyanov, 1972 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Delphacidae (Family)
     Issedonia Popov in Nazarov & Popov, 1980 † · Animalia (Kingdom) > Brachiopoda (Phylum) > Lingulata (Class) > Acrotretida (Order) > Torynelasmatidae (Family)

Isselia
 Isselia Bourguignat, 1877 accepted as Daudebardia Hartmann in Sturm, 1821 · Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Stylommatophora (Order) > Oxychilidae (Family)
     Isselia S. Squinabol, 1891 † (uncertain)· Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Arecales (Order) > Arecaceae (Family)
 Isselia Semper in Schmeltz, 1874 accepted as Stosicia Brusina, 1870 · Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Littorinimorpha (Order) > Rissoinidae (Family)

Isshikia
     Isshikia Shiraki, 1918 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Tabanidae (Family)
 Isshikia Chûjô, 1961 accepted as Menippus Clark, 1864 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Chrysomelidae (Family)

Issina
 Issina Jousseaume, 1898 accepted as Thecodonta A. Adams, 1864 · Animalia (Kingdom) > Mollusca (Phylum) > Bivalvia (Class) > Venerida (Order) > Galeommatidae (Family)
     Issina Melichar, 1906 accepted as Issella Metcalf, 1952 (junior homonym)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Nogodinidae (Family)

Issites
     Issites Ljaschenko, 1980 † (uncertain)· Animalia (Kingdom) > Mollusca (Phylum) > Tentaculita (Class) > Volynitida (Order) > Turmalitidae (Family)
     Issites Haupt, 1956 † (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Hemiptera (awaiting allocation) (Family)

Isthmia
     Isthmia Walker, 1851 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Tettigometridae (Family)
     Isthmia Gray, 1821 (uncertain)· Animalia (Kingdom) > Mollusca (Phylum) > Mollusca (awaiting allocation) (Class) > Mollusca (awaiting allocation) (Order) > Mollusca (awaiting allocation) (Family)
     Isthmia Ehrenberg, 1854 † (uncertain)· Protozoa (Kingdom) > (Phylum) > Protozoa (awaiting allocation) (Class) > (Order) > (Family)
     Isthmia C.A. Agardh, 1832 · Chromista (Kingdom) > Bacillariophyta (Phylum) > Mediophyceae (Class) > Biddulphiales (Order) > Biddulphiaceae (Family)

Isthmiella
     Isthmiella Cleve, 1873 · Chromista (Kingdom) > Bacillariophyta (Phylum) > (Class) > Bacillariophyta (awaiting allocation) (Order) > (Family)
     Isthmiella Darker, 1967 · Fungi (Kingdom) > Ascomycota (Phylum) > Leotiomycetes (Class) > Rhytismatales (Order) > Rhytismataceae (Family)

Istiophorus
 Istiophorus Gray, 1825 accepted as Trachops Gray, 1847 · Animalia (Kingdom) > Chordata (Phylum) > Mammalia (Class) > Chiroptera (Order) > Phyllostomidae (Family)
     Istiophorus Lacepède, 1801 · Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Perciformes (Order) > Istiophoridae (Family)

Isurus
     Isurus Rafinesque, 1810 · Animalia (Kingdom) > Chordata (Phylum) > Chondrichthyes (Class) > Lamniformes (Order) > Lamnidae (Family)
 Isurus Agassiz, 1844 † accepted as Isurichthys Woodward, 1901 † · Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Perciformes (Order) > Perciformes (awaiting allocation) (Family)
     Isurus Agassiz, 1836 † accepted as Isurichthys Woodward, 1901 † (nomen nudum)· Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Perciformes (Order) > Perciformes (awaiting allocation) (Family)

Isus
     Isus Champion, 1906 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Curculionidae (Family)
 Isus Bleeker, 1859 accepted as Leuciscus Cuvier, 1816 · Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Cypriniformes (Order) > Cyprinidae (Family)

Italoptygmatis
     Italoptygmatis Akopyan, 1976 † · Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Heterostropha (Order) > Heterostrophia (awaiting allocation) (Family)
     Italoptygmatis Akopyan, 1973 † (uncertain)· Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Gastropoda (awaiting allocation) (Order) > Gastropoda (awaiting allocation) (Family)

Itamus
 Itamus Raffray, 1904 accepted as Raffrayolus Jacobson, 1914 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Staphylinidae (Family)
     Itamus Schmidt-Goebel, 1846 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Carabidae (Family)
 Itamus Loew, 1849 accepted as Paritamus Verrall, 1909 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Asilidae (Family)
 Itamus Förster, 1868 accepted as Uchidella Townes, 1957 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Ichneumonidae (Family)

Itanus
     Itanus Doubleday in Doubleday & Westwood, 1848 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Lepidoptera (awaiting allocation) (Family)
     Itanus Felder, 1861 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Lepidoptera (awaiting allocation) (Family)

Itatiaya
     Itatiaya Schmidt, 1932 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Issidae (Family)
     Itatiaya Bechyně, 1953 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Chrysomelidae (Family)
 Itatiaya Roewer, 1928 accepted as Acutisoma Roewer, 1913 · Animalia (Kingdom) > Arthropoda (Phylum) > Arachnida (Class) > Opiliones (Order) > Gonyleptidae (Family)
     Itatiaya Mello-Leitão, 1915 · Animalia (Kingdom) > Arthropoda (Phylum) > Arachnida (Class) > Araneae (Order) > Zoropsidae (Family)

Itea
     Itea Koch, 1838 accepted as Itea Koch, 1838 (taxon inquirendum)· Animalia (Kingdom) > Arthropoda (Phylum) > Malacostraca (Class) > Isopoda (Order) > Trichoniscidae (Family)
     Itea Linnaeus, 1753 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Saxifragales (Order) > Iteaceae (Family)

Ithagenes
     Ithagenes Förster, 1868 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Hymenoptera (awaiting allocation) (Family)
 Ithagenes Agassiz, 1846 accepted as Ithaginis Wagler, 1832 · Animalia (Kingdom) > Chordata (Phylum) > Aves (Class) > Galliformes (Order) > Phasianidae (Family)

Ithone
     Ithone Newman, 1838 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Neuroptera (Order) > Ithonidae (Family)
 Ithone Solsky, 1872 accepted as Aiolocaria Crotch, 1871 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Coccinellidae (Family)

Ithyphallus
     Ithyphallus Harold, 1875 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Curculionidae (Family)
 Ithyphallus S.F. Gray, 1821 accepted as Mutinus E.M. Fries, 1849 · Fungi (Kingdom) > Basidiomycota (Phylum) > Agaricomycetes (Class) > Phallales (Order) > Phallaceae (Family)

Ithyporus
     Ithyporus Schönherr, 1836 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Curculionidae (Family)
     Ithyporus Dejean, 1835 accepted as Ithyporus Schönherr, 1836 (nomen nudum)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Curculionidae (Family)

Itia
     Itia Marwick, 1931 † · Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Neogastropoda (Order) > Mitromorphidae (Family)
     Itia Molina, 1810 (uncertain)· Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Dipsacales (Order) > Caprifoliaceae (Family)

Itieria
     Itieria G. Saporta, 1872 † (uncertain)· Plantae (Kingdom) > Algae (awaiting allocation) (Phylum) > Algae (awaiting allocation) (Class) > Algae (awaiting allocation) (Order) > Algae (awaiting allocation) (Family)
     Itieria Matheron, 1842 † · Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Heterostropha (Order) > Heterostrophia (awaiting allocation) (Family)

Ituna
     Ituna Doubleday in Doubleday & Westwood, 1847 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Nymphalidae (Family)
 Ituna Walker, 1854 accepted as Tuina Butler, 1877 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Erebidae (Family)

Itylos
     Itylos Draudt in Seitz, 1921 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Lycaenidae (Family)
     Itylos Nabakov, 1945 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Lepidoptera (awaiting allocation) (Family)

Itys
     Itys Wagler, 1831 (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Aves (Class) > Aves (awaiting allocation) (Order) > Aves (awaiting allocation) (Family)
     Itys Nicéville, 1895 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Lepidoptera (awaiting allocation) (Family)
 Itys Cambridge, 1894 accepted as Grammonota Emerton, 1882 · Animalia (Kingdom) > Arthropoda (Phylum) > Arachnida (Class) > Araneae (Order) > Linyphiidae (Family)

Iulus
     Iulus Wollaston, 1878 (uncertain)· Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Stylommatophora (Order) > Discidae (Family)
     Iulus R.A. Salisbury, 1866 (uncertain)· Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Liliales (Order) > Liliaceae (Family)
 Iulus accepted as Julus Linnaeus, 1758 · Animalia (Kingdom) > Arthropoda (Phylum) > Diplopoda (Class) > Julida (Order) > Julidae (Family)

Iungia
 Iungia Linnaeus f., 1782 accepted as Iungia Linnaeus f., 1782 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Asterales (Order) > Asteraceae (Family)
 Iungia Boehmer in Ludwig, 1760 accepted as Iungia Boehmer in Ludwig, 1760 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Lamiales (Order) > Acanthaceae (Family)

Iva
     Iva Aristov, 2015 † · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Eoblattida (Order) > Doubraviidae (Family)
     Iva Linnaeus, 1753 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Asterales (Order) > Asteraceae (Family)
 Iva Lubbock, 1853 accepted as Pontella Dana, 1846 · Animalia (Kingdom) > Arthropoda (Phylum) > Maxillopoda (Class) > Calanoida (Order) > Pontellidae (Family)
 Iva Fabricius, 1759 accepted as · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Lamiales (Order) > Lamiaceae (Family)

Ivanantonia
     Ivanantonia Shevyreva, 1989 † · Animalia (Kingdom) > Chordata (Phylum) > Mammalia (Class) > Rodentia (Order) > Ivanantoniidae (Family)
     Ivanantonia Shevyreva in Badamgarav & Reshetov, 1985 † accepted as Ivanantonia Shevyreva in Badamgarav & Reshetov, 1985 † (nomen nudum)· Animalia (Kingdom) > Chordata (Phylum) > Mammalia (Class) > Rodentia (Order) > Ivanantoniidae (Family)
     Ivanantonia Shevyreva, 1983 † accepted as Ivanantonia Shevyreva, 1983 † (nomen nudum)· Animalia (Kingdom) > Chordata (Phylum) > Mammalia (Class) > Rodentia (Order) > Ivanantoniidae (Family)

Ivania
 Ivania Zittel, 1895 † accepted as Baylea Koninck, 1883 † · Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > (Order) > Gosseletinidae (Family)
     Ivania Lewis, 1895 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Melandryidae (Family)
     Ivania O.E. Schulz, 1933 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Brassicales (Order) > Brassicaceae (Family)

Ivanovia
     Ivanovia I.V. Khvorova, 1946 † · Plantae (Kingdom) > Chlorophyta (Phylum) > Ulvophyceae (Class) > Bryopsidales (Order) > Codiaceae (Family)
     Ivanovia Dobrolyubova, 1935 † · Animalia (Kingdom) > Cnidaria (Phylum) > (Class) > Rugosa (Order) > Petalaxidae (Family)

Ivanoviella
     Ivanoviella Makridin, 1955 † · Animalia (Kingdom) > Brachiopoda (Phylum) > Rhynchonellata (Class) > Rhynchonellida (Order) > Rhynchonellidae (Family)
     Ivanoviella Abushik et al., 1960 † (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Ostracoda (Class) > Ostracoda (awaiting allocation) (Order) > Ostracoda (awaiting allocation) (Family)
     Ivanoviella Ivanova, 1960 † (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Ostracoda (Class) > Ostracoda (awaiting allocation) (Order) > Ostracoda (awaiting allocation) (Family)

Ivesia
 Ivesia Boynton & Ford, 1995 † accepted as Ivesheadia Boynton & Ford, 1996 † · Animalia (Kingdom) > Vendobionta (Phylum) > (Class) > Aspidellomorpha (Order) > (Family)
     Ivesia Torrey & A. Gray, 1858 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Rosales (Order) > Rosaceae (Family)
 Ivesia Petrunkevitch, 1925 accepted as Nesticus Thorell, 1869 · Animalia (Kingdom) > Arthropoda (Phylum) > Arachnida (Class) > Araneae (Order) > Nesticidae (Family)

Ivshiniellus
     Ivshiniellus Korobov, 1966, nom. nud. † accepted as Atops Emmons, 1844 † (nomen nudum)· Animalia (Kingdom) > Arthropoda (Phylum) > Trilobita (Class) > Ptychopariida (Order) > Atopidae (Family)
 Ivshiniellus Korobov, 1966 † accepted as Atops Emmons, 1844 † · Animalia (Kingdom) > Arthropoda (Phylum) > Trilobita (Class) > Ptychopariida (Order) > Atopidae (Family)

Iwanagara
     Iwanagara Hort., 1960 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Asparagales (Order) > Orchidaceae (Family)
 Iwanagara R.A. Rolfe, 1896 accepted as Iwanagaara R.A. Rolfe, 1896 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Asparagales (Order) > Orchidaceae (Family)

Iwayaspis
     Iwayaspis Kobayashi, 1960 † accepted as Iwayaspis Kobayashi, 1960 † (nomen nudum)· Animalia (Kingdom) > Arthropoda (Phylum) > Trilobita (Class) > Trilobita (awaiting allocation) (Order) > Trilobita (awaiting allocation) (Family)
     Iwayaspis Kobayashi, 1962 † · Animalia (Kingdom) > Arthropoda (Phylum) > Trilobita (Class) > Trilobita (awaiting allocation) (Order) > Trilobita (awaiting allocation) (Family)

Ixalus
 Ixalus Duméril & Bibron, 1841 accepted as Philautus Gistl, 1848 · Animalia (Kingdom) > Chordata (Phylum) > Amphibia (Class) > Anura (Order) > Rhacophoridae (Family)
     Ixalus Gistl, 1848 accepted as Platynotus Fabricius, 1801 (junior homonym)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Tenebrionidae (Family)
 Ixalus Koch in Koch (Keyserling), 1873 accepted as Ixamatus Simon, 1888 · Animalia (Kingdom) > Arthropoda (Phylum) > Arachnida (Class) > Araneae (Order) > Nemesiidae (Family)
     Ixalus Ogilby, 1837 (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Mammalia (Class) > Mammalia (awaiting allocation) (Order) > Mammalia (awaiting allocation) (Family)

Ixia
     Ixia Kerzhner, 1972 † (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Hemiptera (awaiting allocation) (Family)
     Ixia Linnaeus, 1762 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Asparagales (Order) > Iridaceae (Family)
 Ixia Linnaeus, 1753 accepted as Ixia Linnaeus, 1753 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Asparagales (Order) > Iridaceae (Family)

Ixias
 Ixias Sainte-Claire Deville, 1924 accepted as Ixapion Roudier & Tempère, 1973 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Brentidae (Family)
     Ixias Hübner, 1819 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Pieridae (Family)

Ixion
 Ixion Paul'son, 1875 accepted as Cyphocarcinus A. Milne-Edwards, 1868 · Animalia (Kingdom) > Arthropoda (Phylum) > Malacostraca (Class) > Decapoda (Order) > Majidae (Family)
     Ixion Reitter, 1873 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Monotomidae (Family)
     Ixion Alderslade, 2001 accepted as Ezziona Alderslade & Janes, 2017 (junior homonym)· Animalia (Kingdom) > Cnidaria (Phylum) > Octocorallia (Class) > Malacalcyonacea (Order) > Xeniidae (Family)

Ixobiodes
 Ixobiodes Zoological Record accepted as Ixobioides Fonseca, 1934 · Animalia (Kingdom) > Arthropoda (Phylum) > Arachnida (Class) > Mesostigmata (Order) > Ixodorhynchidae (Family)
     Ixobiodes Fonseca, 1934 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Arachnida (Class) > Arachnida (awaiting allocation) (Order) > Arachnida (awaiting allocation) (Family)

Ixodes
 Ixodes Blyth, 1846 accepted as Ixodes Blyth, 1846 · Animalia (Kingdom) > Chordata (Phylum) > Aves (Class) > Aves (awaiting allocation) (Order) > Aves (awaiting allocation) (Family)
     Ixodes Latreille, 1795 · Animalia (Kingdom) > Arthropoda (Phylum) > Arachnida (Class) > Ixodida (Order) > Ixodidae (Family)

Ixodia
     Ixodia Blyth, 1845 (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Aves (Class) > Aves (awaiting allocation) (Order) > Aves (awaiting allocation) (Family)
     Ixodia R. Brown ex W.T. Aiton, 1812 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Asterales (Order) > Asteraceae (Family)

Ixus
     Ixus Dejean, 1821 accepted as Hypera Germar, 1817 (nomen nudum)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Curculionidae (Family)
 Ixus Ehrenberg, 1833 accepted as Ixos Temminck in Temminck & Laugier, 1825 · Animalia (Kingdom) > Chordata (Phylum) > Aves (Class) > Passeriformes (Order) > Pycnonotidae (Family)
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