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Homonyms

IRMNG homonym list - genus level - Initial letter = "U" (177)

Please note, this is a provisional homonyms list from IRMNG on 2024-02-22, 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.

Ua
 Ua Girault, 1929 accepted as Odopoia Walker, 1871 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Torymidae (Family)
     Ua Solounias, Smith & Rios Ibàñez, 2022 † accepted as Ua Solounias, Smith & Rios Ibàñez, 2022 † (junior homonym)· Animalia (Kingdom) > Chordata (Phylum) > Mammalia (Class) > Artiodactyla (Order) > Giraffidae (Family)

Ubaghsia
     Ubaghsia Jullien, 1886 † · Animalia (Kingdom) > Bryozoa (Phylum) > Gymnolaemata (Class) > Cheilostomatida (Order) > Cheilostomatida (awaiting allocation) (Family)
     Ubaghsia Oppenheim, 1899 † (uncertain)· Animalia (Kingdom) > Cnidaria (Phylum) > Cnidaria (awaiting allocation) (Class) > Cnidaria (awaiting allocation) (Order) > Cnidaria (awaiting allocation) (Family)

Uber
     Uber Cotton & Godfrey, 1931 † (uncertain)· Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Littorinimorpha (Order) > Naticidae (Family)
 Uber Philippi, 1853 accepted as Polinices Montfort, 1810 · Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Littorinimorpha (Order) > Naticidae (Family)

Uca
     Uca Leach, 1814 · Animalia (Kingdom) > Arthropoda (Phylum) > Malacostraca (Class) > Decapoda (Order) > Ocypodidae (Family)
 Uca Latreille, 1819 accepted as Ucides Rathbun, 1897 · Animalia (Kingdom) > Arthropoda (Phylum) > Malacostraca (Class) > Decapoda (Order) > Ucididae (Family)

Udaria
     Udaria A. Gupta, 1996 † · Fungi (Kingdom) > Fungi incertae sedis (Phylum) > (Class) > (Order) > (Family)
     Udaria D.K. Singh, S. Majumdar & D. Singh, 2018 accepted as Ramudaria D.K. Singh, S. Majumdar, D. Singh & E.A. Molinari Novoa, 2020 (junior homonym)· Plantae (Kingdom) > Marchantiophyta (Phylum) > Jungermanniopsida (Class) > Jungermanniales (Order) > Lophocoleaceae (Family)

Uddmania
     Uddmania Frey, 1942 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Diptera (awaiting allocation) (Family)
     Uddmania Bergroth, 1915 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Hemiptera (awaiting allocation) (Family)

Udora
     Udora Münster, 1839 † · Animalia (Kingdom) > Arthropoda (Phylum) > Malacostraca (Class) > Decapoda (Order) > Procaridoidea (awaiting allocation) (Family)
 Udora Nuttall, 1818 accepted as Elodea A. Michaux, 1803 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Alismatales (Order) > Hydrocharitaceae (Family)

Udorius
 Udorius Lucas, 1920 accepted as Udorius Lucas, 1920 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Dryopidae (Family)
 Udorius Broun, 1882 accepted as Hydora Broun, 1882 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Elmidae (Family)

Ueckermannia
     Ueckermannia Kazmierski, 1996 · Animalia (Kingdom) > Arthropoda (Phylum) > Arachnida (Class) > Actinedida (Order) > Tydeidae (Family)
     Ueckermannia Chant & McMurtry, 2005 · Animalia (Kingdom) > Arthropoda (Phylum) > Arachnida (Class) > Mesostigmata (Order) > Phytoseiidae (Family)

Ugandella
     Ugandella Schmidt, 1932 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Issidae (Family)
     Ugandella Sjöstedt, 1923 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Orthoptera (Order) > Orthoptera (awaiting allocation) (Family)

Uhleria
 Uhleria Comstock, 1883 accepted as Fiorinia Targioni-Tozzetti, 1869 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Diaspididae (Family)
 Uhleria Crawford, 1914 accepted as Lasiopsylla Froggatt, 1900 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Psyllidae (Family)

Uhleriella
     Uhleriella Ball, 1902 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Jassidae (Family)
     Uhleriella Matsumura, 1913 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Coreidae (Family)

Uhligia
     Uhligia Koenen, 1904 † · Animalia (Kingdom) > Mollusca (Phylum) > Cephalopoda (Class) > Ammonitida (Order) > Ammonoidea (awaiting allocation) (Family)
     Uhligia Horak, 1990 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Mordellidae (Family)

Uhligina
     Uhligina Schubert, 1899 (uncertain)· Protozoa (Kingdom) > (Phylum) > Protozoa (awaiting allocation) (Class) > (Order) > (Family)
 Uhligina Yabe & Hanzawa, 1922 † accepted as Eorupertia Yabe & Hanzawa, 1925 † · Chromista (Kingdom) > Retaria (Phylum) > Globothalamea (Class) > Rotaliida (Order) > Victoriellidae (Family)

Uighuroniscus
     Uighuroniscus Su, 1985 † (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Actinopterygii (awaiting allocation) (Order) > Actinopterygii (awaiting allocation) (Family)
     Uighuroniscus Su, 1980 † (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Actinopterygii (awaiting allocation) (Order) > Actinopterygii (awaiting allocation) (Family)

Uintasorex
     Uintasorex Matthew, 1909 † · Animalia (Kingdom) > Chordata (Phylum) > Mammalia (Class) > Primates (Order) > Microsyopidae (Family)
 Uintasorex Brown & Rose, 1976 † accepted as Uintasorex Matthew, 1909 † · Animalia (Kingdom) > Chordata (Phylum) > Mammalia (Class) > Primates (Order) > Microsyopidae (Family)

Ulaikoilia
     Ulaikoilia Bílý & Kubán, 2009 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Buprestidae (Family)
 Ulaikoilia Bílý & Kubáň in Bílý, Kubáň & Volkovitsh, 2009 accepted as Melobasina Kerremans, 1900 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Buprestidae (Family)

Ulania
     Ulania Lin & Zhang, 1979 † (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Trilobita (Class) > Trilobita (awaiting allocation) (Order) > Trilobita (awaiting allocation) (Family)
 Ulania Kirby, 1892 accepted as Ulamia Möschler, 1883 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Limacodidae (Family)
     Ulania Qi, 1990 † accepted as Ulanodon Bai & Qi, 2022 † (junior homonym)· Animalia (Kingdom) > Chordata (Phylum) > Mammalia (Class) > Perissodactyla (Order) > Hyracodontidae (Family)

Ulea
 Ulea Müller Hal., 1897 accepted as Uleastrum W.R. Buck, 1985 · Plantae (Kingdom) > Bryophyta (Phylum) > Bryopsida (Class) > Orthotrichales (Order) > Orthotrichaceae (Family)
 Ulea J. Schröter, 1892 accepted as Uleiella J. Schröter, 1894 · Fungi (Kingdom) > Basidiomycota (Phylum) > Ustilaginomycetes (Class) > Ustilaginales (Order) > Uleiellaceae (Family)

Ulema
     Ulema Megerle, 1832 accepted as Ulema Megerle, 1832 (nomen nudum)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Coleoptera (awaiting allocation) (Family)
 Ulema Bedel, 1889 accepted as Oulema Des Gozis, 1886 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Chrysomelidae (Family)

Uleopsis
     Uleopsis Thériot, 1936 (uncertain)· Plantae (Kingdom) > Bryophyta (Phylum) > Bryopsida (Class) > Dicranales (Order) > Dicranaceae (Family)
     Uleopsis F. Fedde in F. Fedde & K. Schuster, 1911 (uncertain)· Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Commelinales (Order) > Commelinaceae (Family)

Ullia
 Ullia Roewer, 1943 accepted as Carlotta Roewer, 1943 · Animalia (Kingdom) > Arthropoda (Phylum) > Arachnida (Class) > Opiliones (Order) > Gonyleptidae (Family)
     Ullia Henningsmoen, 1949 † · Animalia (Kingdom) > Arthropoda (Phylum) > Ostracoda (Class) > Ostracoda (awaiting allocation) (Order) > Ostracoda incertae sedis (Family)

Ulmiphyllum
 Ulmiphyllum G. Andreánszky, 1959 † accepted as · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Rosales (Order) > Rosales (awaiting allocation) (Family)
     Ulmiphyllum Fontaine, 1889 † (uncertain)· Plantae (Kingdom) > Plantae (awaiting allocation) (Phylum) > Plantae (awaiting allocation) (Class) > Plantae (awaiting allocation) (Order) > Plantae (awaiting allocation) (Family)

Ulmites
 Ulmites J.W. Dawson, 1891 † accepted as · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Magnoliopsida (awaiting allocation) (Order) > (Family)
     Ulmites Endlicher, 1848 † (uncertain)· Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Rosales (Order) > Ulmaceae (Family)

Ulmoxylon
 Ulmoxylon E. Hofmann, 1939 † accepted as · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Rosales (Order) > Ulmaceae (Family)
     Ulmoxylon P. Kaiser, 1879 † (uncertain)· Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Rosales (Order) > Ulmaceae (Family)

Ulmus
     Ulmus Linnaeus, 1753 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Rosales (Order) > Ulmaceae (Family)
     Ulmus Distant, 1905 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Tingidae (Family)

Ulna
     Ulna Capuse, 1973 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Lepidoptera (awaiting allocation) (Family)
 Ulna accepted as Ulua Jordan & Snyder, 1908 · Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Perciformes (Order) > Carangidae (Family)

Ulocerus
     Ulocerus Schönherr, 1823 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Brentidae (Family)
 Ulocerus Dalman, 1824 accepted as Ulocerus Schönherr, 1823 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Brentidae (Family)

Ulochaetes
     Ulochaetes Thomson, 1860 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Cerambycidae (Family)
     Ulochaetes LeConte, 1854 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Cerambycidae (Family)

Uloma
     Uloma Stephens, 1829 accepted as Gnatocerus Thunberg, 1814 (nomen nudum)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Tenebrionidae (Family)
 Uloma Fauvel, 1904 accepted as Gnatocerus Thunberg, 1814 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Tenebrionidae (Family)
 Uloma Stephens, 1832 accepted as Gnatocerus Thunberg, 1814 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Tenebrionidae (Family)
 Uloma Rafinesque, 1837 accepted as Colea Bojer ex C.F. Meisner, 1840 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Lamiales (Order) > Bignoniaceae (Family)
     Uloma Dejean, 1821 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Tenebrionidae (Family)
     Uloma Latreille in Cuvier, 1829 accepted as Uloma Dejean, 1821 (unavailable name)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Tenebrionidae (Family)

Ulomoides
     Ulomoides Blackburn, 1888 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Tenebrionidae (Family)
     Ulomoides Escalera, 1927 accepted as Platycrypticus Español, 1951 (junior homonym)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Tenebrionidae (Family)

Uloporus
 Uloporus Quélet, 1886 accepted as Gyrodon Opatowski, 1836 · Fungi (Kingdom) > Basidiomycota (Phylum) > Agaricomycetes (Class) > Boletales (Order) > Paxillaceae (Family)
 Uloporus Casey, 1889 accepted as Enneboeus Waterhouse, 1878 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Archeocrypticidae (Family)

Uloptera
     Uloptera Fenzl, 1843 (uncertain)· Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Apiales (Order) > Apiaceae (Family)
 Uloptera Burmeister, 1842 accepted as Uloptera Burmeister, 1842 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Scarabaeidae (Family)

Ulosomus
 Ulosomus Schönherr, 1825 accepted as Acalles Schönherr, 1825 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Curculionidae (Family)
 Ulosomus Schoenherr, 1826 accepted as Neoulosomus O'Brien & Wibmer, 1982 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Curculionidae (Family)

Ulospermum
 Ulospermum A. Pomel, 1849 † accepted as · Plantae (Kingdom) > Plantae (awaiting allocation) (Phylum) > Plantae (awaiting allocation) (Class) > Plantae (awaiting allocation) (Order) > Plantae (awaiting allocation) (Family)
     Ulospermum Link, 1821 (uncertain)· Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Apiales (Order) > Apiaceae (Family)

Ulostoma
     Ulostoma Albers, 1850 (uncertain)· Animalia (Kingdom) > Mollusca (Phylum) > Mollusca (awaiting allocation) (Class) > Mollusca (awaiting allocation) (Order) > Mollusca (awaiting allocation) (Family)
 Ulostoma D. Don ex G. Don, 1837 accepted as Gentiana Linnaeus, 1753 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Gentianales (Order) > Gentianaceae (Family)

Ulotrichella
     Ulotrichella Iyengar, 1975 · Plantae (Kingdom) > Chlorophyta (Phylum) > Chlorophyceae (Class) > Chlamydomonadales (Order) > Chlorococcaceae (Family)
 Ulotrichella Y. Berger-Perrot, 1981 accepted as Chlorothrix Y. Berger-Perrot in Y. Berger-Perrot & J.C. Thomas, 1982 · Plantae (Kingdom) > Chlorophyta (Phylum) > Ulvophyceae (Class) > Ulotrichales (Order) > Ulotrichaceae (Family)

Ulrichia
     Ulrichia Jones, 1890 † · Animalia (Kingdom) > Arthropoda (Phylum) > Ostracoda (Class) > Palaeocopida (Order) > Bolliidae (Family)
     Ulrichia Kinzelbach, 1971 † · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Strepsiptera (Order) > Stylopidae (Family)

Ulricholithus
     Ulricholithus Bancroft & Lamont, 1949 † (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Trilobita (Class) > Trilobita (awaiting allocation) (Order) > Trilobita (awaiting allocation) (Family)
     Ulricholithus Bancroft, 1933 † (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Trilobita (Class) > Trilobita (awaiting allocation) (Order) > Trilobita (awaiting allocation) (Family)

Ulugbekia
     Ulugbekia Zakirov, 1961 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Boraginales (Order) > Boraginaceae (Family)
     Ulugbekia Savchenko, 1970 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Limoniidae (Family)

Uluguria
     Uluguria Vezda, 2004 · Fungi (Kingdom) > Ascomycota (Phylum) > Lecanoromycetes (Class) > Ostropales (Order) > Gomphillaceae (Family)
     Uluguria Otte, 1987 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Orthoptera (Order) > Gryllidae (Family)
     Uluguria Richards, 1965 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Diptera (awaiting allocation) (Family)
     Uluguria Hoffman, 1964 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Diplopoda (Class) > Polydesmida (Order) > Gomphodesmidae (Family)

Ulula
     Ulula Cuvier, 1817 (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Aves (Class) > Aves (awaiting allocation) (Order) > Aves (awaiting allocation) (Family)
 Ulula Rambur, 1842 accepted as Ululodes Currie in Smith, 1900 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Neuroptera (Order) > Ascalaphidae (Family)

Ulva
     Ulva Linnaeus, 1753 · Plantae (Kingdom) > Chlorophyta (Phylum) > Ulvophyceae (Class) > Ulvales (Order) > Ulvaceae (Family)
     Ulva Lindsey, 1925 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Hesperiidae (Family)
 Ulva Adanson, 1763 accepted as · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Poales (Order) > Cyperaceae (Family)

Ulvaria
     Ulvaria Ruprecht, 1850 · Plantae (Kingdom) > Chlorophyta (Phylum) > Ulvophyceae (Class) > Ulvales (Order) > Ulvaceae (Family)
     Ulvaria Jordan & Evermann, 1896 · Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Perciformes (Order) > Stichaeidae (Family)

Ulvella
     Ulvella P.L. Crouan & H.M. Crouan, 1859 · Plantae (Kingdom) > Chlorophyta (Phylum) > Ulvophyceae (Class) > Ulvales (Order) > Ulvellaceae (Family)
     Ulvella (Nylander) V. Trevisan, 1880 · Fungi (Kingdom) > Ascomycota (Phylum) > Ascomycota incertae sedis (Class) > Ascomycota incertae sedis (Order) > Ascomycota incertae sedis (Family)

Umbella
     Umbella d'Orbigny in Sagra, 1841 (uncertain)· Animalia (Kingdom) > Mollusca (Phylum) > Mollusca (awaiting allocation) (Class) > Mollusca (awaiting allocation) (Order) > Mollusca (awaiting allocation) (Family)
     Umbella Scudder, 1882 accepted as Umbella Scudder, 1882 (nomen nudum)· Animalia (Kingdom) > Mollusca (Phylum) > Mollusca (awaiting allocation) (Class) > Mollusca (awaiting allocation) (Order) > Mollusca (awaiting allocation) (Family)
 Umbella V.P. Maslov in E.V. Bykova, 1955 † accepted as Umbellina Loeblich & Tappan, 1961 † · Plantae (Kingdom) > Charophyta (Phylum) > Charophyceae (Class) > Umbellinales (Order) > Umbellinaceae (Family)

Umbellula
     Umbellula Cuvier, 1800 accepted as Umbellula Cuvier, 1800 (nomen nudum)· Animalia (Kingdom) > Cnidaria (Phylum) > Cnidaria (awaiting allocation) (Class) > Cnidaria (awaiting allocation) (Order) > Cnidaria (awaiting allocation) (Family)
     Umbellula Gray, 1870 · Animalia (Kingdom) > Cnidaria (Phylum) > Anthozoa (Class) > Pennatulacea (Order) > Umbellulidae (Family)
     Umbellula Cuvier, 1798 · Animalia (Kingdom) > Cnidaria (Phylum) > Anthozoa (Class) > Pennatulacea (Order) > Umbellulidae (Family)
 Umbellula E.F. Morris, 1955 accepted as Pseudobotrytis Krzemieniewska & Badura, 1954 · Fungi (Kingdom) > Ascomycota (Phylum) > Sordariomycetes (Class) > Coniochaetales (Order) > Coniochaetales incertae sedis (Family)
 Umbellula K.B. Korde, 1973 † accepted as Palaeoumbellula E.A. Molinari-Novoa & M.D. Guiry, 2021 † · Animalia (Kingdom) > Animalia incertae sedis (Phylum) > (Class) > (Order) > Epiphytaceae (Family)

Umbellularia
     Umbellularia (C.G.D. Nees) Nuttall, 1842 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Laurales (Order) > Lauraceae (Family)
     Umbellularia Lamarck, 1801 (uncertain)· Animalia (Kingdom) > Cnidaria (Phylum) > Cnidaria (awaiting allocation) (Class) > Cnidaria (awaiting allocation) (Order) > Cnidaria (awaiting allocation) (Family)

Umbilicaria
     Umbilicaria G.F. Hoffmann, 1789 · Fungi (Kingdom) > Ascomycota (Phylum) > Lecanoromycetes (Class) > Umbilicariales (Order) > Umbilicariaceae (Family)
     Umbilicaria Heister ex Fabricius, 1759 (uncertain)· Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Boraginales (Order) > Boraginaceae (Family)

Umbilicus
     Umbilicus A.P. de Candolle, 1801 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Saxifragales (Order) > Crassulaceae (Family)
     Umbilicus Duan & Cao, 1989 † (uncertain)· Animalia (Kingdom) > Animalia incertae sedis (Phylum) > (Class) > (Order) > (Family)

Umbla
 Umbla Catesby, 1771 accepted as Umbla Catesby, 1771 · Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Perciformes (Order) > Sphyraenidae (Family)
 Umbla Bonaparte, 1846 accepted as Umbla Bonaparte, 1846 · Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Esociformes (Order) > Umbridae (Family)
 Umbla Rapp, 1854 accepted as Salvelinus Richardson, 1836 · Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Salmoniformes (Order) > Salmonidae (Family)

Umbonella
 Umbonella A. Adams, 1863 accepted as Isanda H. Adams & A. Adams, 1854 · Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Trochida (Order) > Trochidae (Family)
 Umbonella Hincks, 1880 accepted as Umbonula Hincks, 1880 · Animalia (Kingdom) > Bryozoa (Phylum) > Gymnolaemata (Class) > Cheilostomatida (Order) > Umbonulidae (Family)

Umbotrochus
     Umbotrochus Perner, 1903 † · Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Archaeogastropoda (Order) > Archaeogastropoda (awaiting allocation) (Family)
 Umbotrochus Thiele, 1924 accepted as Callumbonella Thiele, 1924 · Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Trochida (Order) > Trochidae (Family)

Umbra
 Umbra Gronovius, 1763 accepted as Umbra Gronovius, 1763 · Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Esociformes (Order) > Umbridae (Family)
     Umbra Scopoli, 1777 (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Esociformes (Order) > Umbridae (Family)
     Umbra Kramer in Scopoli, 1777 · Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Esociformes (Order) > Umbridae (Family)
     Umbra Cetti, 1777 accepted as Umbrina Cuvier, 1816 (nomen nudum)· Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Perciformes (Order) > Sciaenidae (Family)

Umbraculum
     Umbraculum Schumacher, 1817 · Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Umbraculida (Order) > Umbraculidae (Family)
     Umbraculum Gottsche, 1861 (uncertain)· Plantae (Kingdom) > Marchantiophyta (Phylum) > Jungermanniopsida (Class) > Metzgeriales (Order) > Hymenophytonaceae (Family)
 Umbraculum O. Kuntze, 1891 accepted as · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Ericales (Order) > Primulaceae (Family)

Umbraticus
 Umbraticus Özdikmen, 2009 accepted as Tomogonopus Sierwald & Mauriès, 2017 · Animalia (Kingdom) > Arthropoda (Phylum) > Diplopoda (Class) > Spirostreptida (Order) > Spirostreptidae (Family)
     Umbraticus Voet, 1806 accepted as (nomen nudum)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Tenebrionidae (Family)

Umbrina
     Umbrina Cuvier, 1816 · Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Perciformes (Order) > Sciaenidae (Family)
     Umbrina Robineau-Desvoidy, 1830 accepted as Umbrina Robineau-Desvoidy, 1830 (taxon inquirendum)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Diptera (awaiting allocation) (Family)

Unaus
     Unaus Gray, 1821 (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Mammalia (Class) > Mammalia (awaiting allocation) (Order) > Mammalia (awaiting allocation) (Family)
     Unaus Rafinesque, 1815 accepted as Unaus Rafinesque, 1815 (nomen nudum)· Animalia (Kingdom) > Chordata (Phylum) > Mammalia (Class) > Mammalia (awaiting allocation) (Order) > Mammalia (awaiting allocation) (Family)

Unaüs
 Unaüs Gray, 1821 accepted as Unaus Gray, 1821 · Animalia (Kingdom) > Chordata (Phylum) > Mammalia (Class) > Mammalia (awaiting allocation) (Order) > Mammalia (awaiting allocation) (Family)
     Unaüs Rafinesque, 1815 accepted as Unaus Rafinesque, 1815 (nomen nudum)· Animalia (Kingdom) > Chordata (Phylum) > Mammalia (Class) > Mammalia (awaiting allocation) (Order) > Mammalia (awaiting allocation) (Family)

Uncaria
     Uncaria Schreber, 1789 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Gentianales (Order) > Rubiaceae (Family)
 Uncaria Burchell, 1822 accepted as Harpagophytum A.P. de Candolle ex Meisner, 1840 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Lamiales (Order) > Pedaliaceae (Family)

Uncina
     Uncina Kaplun in Kaplun & Krupchenko, 1991 † · Animalia (Kingdom) > Brachiopoda (Phylum) > Rhynchonellata (Class) > Rhynchonellida (Order) > Uncinulidae (Family)
     Uncina Quenstedt, 1850 † · Animalia (Kingdom) > Arthropoda (Phylum) > Malacostraca (Class) > Decapoda (Order) > Uncinidae (Family)

Uncinaria
     Uncinaria Frölich, 1789 · Animalia (Kingdom) > Nematoda (Phylum) > Chromadorea (Class) > Rhabditida (Order) > Ancylostomatidae (Family)
 Uncinaria H.G.L. Reichenbach, 1841 accepted as Uncaria Schreber, 1789 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Gentianales (Order) > Rubiaceae (Family)
 Uncinaria Vest, 1867 accepted as Vestia Hesse, 1916 · Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Stylommatophora (Order) > Clausiliidae (Family)

Uncinata
     Uncinata Bullington, 1940 · Chromista (Kingdom) > Ciliophora (Phylum) > Spirotrichea (Class) > Urostylida (Order) > Urostylida incertae sedis (Family)
 Uncinata Bian & Shi accepted as Phlugiolopsis Zeuner, 1940 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Orthoptera (Order) > Tettigoniidae (Family)

Uncinia
     Uncinia Quatrefages, 1865 · Animalia (Kingdom) > Annelida (Phylum) > Polychaeta (Class) > Spionida (Order) > Spionidae (Family)
     Uncinia Persoon, 1807 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Poales (Order) > Cyperaceae (Family)
 Uncinia Velenovský, 1934 accepted as Hamatocanthoscypha M. Svrček, 1977 · Fungi (Kingdom) > Ascomycota (Phylum) > Leotiomycetes (Class) > Helotiales (Order) > Hyaloscyphaceae (Family)

Uncinulella
     Uncinulella Del Guercio, 1919 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Cecidomyiidae (Family)
 Uncinulella Hara, 1936 accepted as Erysiphe R. Hedwig ex A.P. de Candolle, 1805 · Fungi (Kingdom) > Ascomycota (Phylum) > Leotiomycetes (Class) > Erysiphales (Order) > Erysiphaceae (Family)

Uncinulina
     Uncinulina Terquem, 1862 · Animalia (Kingdom) > Echinodermata (Phylum) > Holothuroidea (Class) > Aspidochirotida (Order) > Aspidochirotida (awaiting allocation) (Family)
     Uncinulina Bayle, 1878 † (uncertain)· Animalia (Kingdom) > Brachiopoda (Phylum) > Rhynchonellata (Class) > Rhynchonellida (Order) > Trigonirhynchiidae (Family)

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

Unda
     Unda Ponomarenko in Arnol'di, Zherikhin, Nikritin & Ponomarenko, 1977 † · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Trachypachidae (Family)
 Unda Schaeffer, 1926 accepted as Vannella Bovee, 1965 · Protozoa (Kingdom) > Amoebozoa (Phylum) > Discosea (Class) > Glycostylida (Order) > Vannellidae (Family)

Undaria
     Undaria Suringar, 1873 · Chromista (Kingdom) > Ochrophyta (Phylum) > Phaeophyceae (Class) > Laminariales (Order) > Alariaceae (Family)
     Undaria Muir-Wood & Cooper, 1960 † · Animalia (Kingdom) > Brachiopoda (Phylum) > Strophomenata (Class) > Productida (Order) > Monticuliferidae (Family)
 Undaria Oken, 1815 accepted as Agaricia Lamarck, 1801 · Animalia (Kingdom) > Cnidaria (Phylum) > Anthozoa (Class) > Scleractinia (Order) > Agariciidae (Family)

Undariella
     Undariella Y.E. Petrov & O.G. Kusakin ['Kussakin'], 1997 · Chromista (Kingdom) > Ochrophyta (Phylum) > Phaeophyceae (Class) > Laminariales (Order) > Alariaceae (Family)
 Undariella Y.P. Lee, 1998 accepted as Undariopsis K. Miyabe & K. Okamura in K. Okamura, 1902 · Chromista (Kingdom) > Ochrophyta (Phylum) > Phaeophyceae (Class) > Laminariales (Order) > Alariaceae (Family)

Undella
     Undella Daday, 1887 · Chromista (Kingdom) > Ciliophora (Phylum) > Spirotrichea (Class) > Oligotrichida (Order) > Undellidae (Family)
     Undella Jörgensen, 1925 (uncertain)· Protozoa (Kingdom) > (Phylum) > Protozoa (awaiting allocation) (Class) > (Order) > (Family)

Underwoodia
     Underwoodia C.H. Peck, 1890 · Fungi (Kingdom) > Ascomycota (Phylum) > Pezizomycetes (Class) > Pezizales (Order) > Pezizales incertae sedis (Family)
     Underwoodia Cook & Collins, 1895 · Animalia (Kingdom) > Arthropoda (Phylum) > Diplopoda (Class) > Chordeumatida (Order) > Caseyidae (Family)

Undina
     Undina Gould, 1837 (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Aves (Class) > Aves (awaiting allocation) (Order) > Aves (awaiting allocation) (Family)
     Undina Gistl, 1848 · Animalia (Kingdom) > Echinodermata (Phylum) > Asteroidea (Class) > Valvatida (Order) > Ophidiasteridae (Family)
 Undina Dana, 1849 accepted as Undinula A. Scott, 1909 · Animalia (Kingdom) > Arthropoda (Phylum) > Maxillopoda (Class) > Calanoida (Order) > Calanidae (Family)
     Undina E.M. Fries, 1825 · Bacteria (Kingdom) > Cyanobacteria (Phylum) > Cyanophyceae (Class) > Nostocales (Order) > Nostocaceae (Family)
     Undina Münster, 1834 † · Animalia (Kingdom) > Chordata (Phylum) > Sarcopterygii (Class) > Coelacanthiformes (Order) > Latimeriidae (Family)

Ungeria
     Ungeria H.W. Schott & Endlicher, 1832 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Malvales (Order) > Malvaceae (Family)
 Ungeria Salfeld, 1908 † accepted as · Plantae (Kingdom) > Tracheophyta (Phylum) > Polypodiopsida (Class) > Polypodiidae (awaiting allocation) (Order) > Polypodiidae (awaiting allocation) (Family)

Ungula
     Ungula Termier & Termier, 1977 † (uncertain)· Animalia (Kingdom) > Porifera (Phylum) > Porifera (awaiting allocation) (Class) > Porifera (awaiting allocation) (Order) > Porifera (awaiting allocation) (Family)
 Ungula Pander, 1830 † accepted as Obolus Eichwald, 1829 † · Animalia (Kingdom) > Brachiopoda (Phylum) > Lingulata (Class) > Lingulida (Order) > Obolidae (Family)
 Ungula B.A. Barlow, 1964 accepted as Amyema Van Tieghem, 1894 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Santalales (Order) > Loranthaceae (Family)

Ungulaspis
     Ungulaspis MacGillivray, 1921 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Diaspididae (Family)
 Ungulaspis Afanassieva & Karatajūtė-Talimaa, 1998 † accepted as Paraungulaspis Afanassieva & Karatajūtė-Talimaa, 2013 † · Animalia (Kingdom) > Chordata (Phylum) > Cephalaspidomorphi (Class) > Cephalaspidiformes (Order) > Cephalaspidiformes (awaiting allocation) (Family)

Ungulina
     Ungulina Bosc, 1801 · Animalia (Kingdom) > Mollusca (Phylum) > Bivalvia (Class) > Venerida (Order) > Ungulinidae (Family)
 Ungulina Patouillard, 1900 accepted as Fomes (E.M. Fries) E.M. Fries, 1849 · Fungi (Kingdom) > Basidiomycota (Phylum) > Agaricomycetes (Class) > Polyporales (Order) > Polyporaceae (Family)

Ungulites
     Ungulites Zhuravleva, 1972 † · Animalia (Kingdom) > Mollusca (Phylum) > Cephalopoda (Class) > Discosorida (Order) > Discosorida (awaiting allocation) (Family)
 Ungulites Bronn, 1848 † accepted as Obolus Eichwald, 1829 † · Animalia (Kingdom) > Brachiopoda (Phylum) > Lingulata (Class) > Lingulida (Order) > Obolidae (Family)
     Ungulites Stauffer, 1933 † · Animalia (Kingdom) > Annelida (Phylum) > Polychaeta (Class) > Polychaeta (awaiting allocation) (Order) > Polychaeta incertae sedis (Family)

Unica
     Unica Šnoflák, 1951 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Hymenoptera (awaiting allocation) (Family)
     Unica Gorbach, 1985 † · Animalia (Kingdom) > Mollusca (Phylum) > Bivalvia (Class) > Pterioida (Order) > Pterioida (awaiting allocation) (Family)

Unicarinata
     Unicarinata Pan, 1982 † · Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Neotaenioglossa (Order) > Neotaenioglossa (awaiting allocation) (Family)
     Unicarinata Sheng, Li & Sun, 2022 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Ichneumonidae (Family)

Unicinaria
 Unicinaria Linstow, 1902 accepted as Uncinaria Frölich, 1789 · Animalia (Kingdom) > Nematoda (Phylum) > Chromadorea (Class) > Rhabditida (Order) > Ancylostomatidae (Family)
 Unicinaria Westerlund, 1884 accepted as Vestia Hesse, 1916 · Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Stylommatophora (Order) > Clausiliidae (Family)

Unicola
     Unicola Rafinesque, 1815 accepted as Unicola Rafinesque, 1815 (nomen nudum)· Animalia (Kingdom) > Platyhelminthes (Phylum) > Trematoda (Class) > Trematoda (awaiting allocation) (Order) > Trematoda (awaiting allocation) (Family)
 Unicola accepted as Unciola Say, 1818 · Animalia (Kingdom) > Arthropoda (Phylum) > Malacostraca (Class) > Amphipoda (Order) > Unciolidae (Family)
 Unicola Haldeman, 1842 accepted as Unionicola Haldeman, 1842 · Animalia (Kingdom) > Arthropoda (Phylum) > Arachnida (Class) > Actinedida (Order) > Unionicolidae (Family)

Unicornu
     Unicornu Grateloup, 1835 (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Mammalia (Class) > Mammalia (awaiting allocation) (Order) > Mammalia (awaiting allocation) (Family)
     Unicornu Fabricius, 1823 (uncertain)· Animalia (Kingdom) > Mollusca (Phylum) > Mollusca (awaiting allocation) (Class) > Mollusca (awaiting allocation) (Order) > Mollusca (awaiting allocation) (Family)

Unicornus
 Unicornus Montfort, 1810 accepted as Acanthina Fischer von Waldheim, 1807 · Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Neogastropoda (Order) > Muricidae (Family)
 Unicornus Rafinesque, 1815 accepted as Rhinoceros Linnaeus, 1758 · Animalia (Kingdom) > Chordata (Phylum) > Mammalia (Class) > Perissodactyla (Order) > Rhinocerotidae (Family)

Unidens
     Unidens Hayward & Kawagata, 2012 † accepted as Unidens Hayward & Kawagata, 2012 † (taxon inquirendum)· Chromista (Kingdom) > Retaria (Phylum) > Globothalamea (Class) > Rotaliida (Order) > Stilostomellidae (Family)
 Unidens Schinz in Cuvier, 1822 accepted as Monodonta Lamarck, 1799 · Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Trochida (Order) > Trochidae (Family)

Unifolium
 Unifolium Zinn, 1757 accepted as Unifolium Zinn, 1757 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Liliales (Order) > Liliaceae (Family)
 Unifolium Ludwig, 1757 accepted as Maianthemum F.H. Wiggers, 1780 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Asparagales (Order) > Asparagaceae (Family)

Uniplicaria
     Uniplicaria Pfeiffer, 1856 (uncertain)· Animalia (Kingdom) > Mollusca (Phylum) > Mollusca (awaiting allocation) (Class) > Mollusca (awaiting allocation) (Order) > Mollusca (awaiting allocation) (Family)
     Uniplicaria Martens, 1895 (uncertain)· Animalia (Kingdom) > Mollusca (Phylum) > Mollusca (awaiting allocation) (Class) > Mollusca (awaiting allocation) (Order) > Mollusca (awaiting allocation) (Family)

Unkana
     Unkana Matsumura, 1935 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Hemiptera (awaiting allocation) (Family)
     Unkana Distant, 1886 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Hesperiidae (Family)

Unxia
     Unxia Thomson, 1860 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Cerambycidae (Family)
     Unxia Linnaeus f., 1782 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Asterales (Order) > Asteraceae (Family)

Uphantenia
     Uphantenia Vanuxem, 1842 † (uncertain)· Plantae (Kingdom) > Plantae (awaiting allocation) (Phylum) > Plantae (awaiting allocation) (Class) > Plantae (awaiting allocation) (Order) > Plantae (awaiting allocation) (Family)
 Uphantenia Dawson & Hinde, 1889 † accepted as Uphantenia Dawson & Hinde, 1889 † · Animalia (Kingdom) > Porifera (Phylum) > Porifera (awaiting allocation) (Class) > Porifera (awaiting allocation) (Order) > Porifera (awaiting allocation) (Family)

Upogebia
     Upogebia Leach, 1814 · Animalia (Kingdom) > Arthropoda (Phylum) > Malacostraca (Class) > Decapoda (Order) > Upogebiidae (Family)
 Upogebia Borradaile, 1903 accepted as Upogebia Leach, 1814 · Animalia (Kingdom) > Arthropoda (Phylum) > Malacostraca (Class) > Decapoda (Order) > Upogebiidae (Family)

Uptiotes
     Uptiotes Walckenaer, 1833 accepted as Uptiotes Walckenaer, 1833 (nomen nudum)· Animalia (Kingdom) > Arthropoda (Phylum) > Arachnida (Class) > Araneae (Order) > Uloboridae (Family)
     Uptiotes Walckenaer, 1838 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Arachnida (Class) > Araneae (Order) > Uloboridae (Family)

Uracanthus
     Uracanthus Fitzinger, 1865 (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Aves (Class) > Aves (awaiting allocation) (Order) > Aves (awaiting allocation) (Family)
     Uracanthus Hope, 1835 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Cerambycidae (Family)
     Uracanthus Diesing, 1861 (uncertain)· Animalia (Kingdom) > Nematoda (Phylum) > Nematoda (awaiting allocation) (Class) > Nematoda (awaiting allocation) (Order) > Nematoda (awaiting allocation) (Family)

Uraeus
     Uraeus Agassiz, 1832 † (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Amiiformes (Order) > Caturidae (Family)
 Uraeus Wagler, 1830 accepted as Naja Laurenti, 1768 · Animalia (Kingdom) > Chordata (Phylum) > Reptilia (Class) > Squamata (Order) > Elapidae (Family)

Uragus
     Uragus Keyserling & Blasius, 1840 · Animalia (Kingdom) > Chordata (Phylum) > Aves (Class) > Passeriformes (Order) > Fringillidae (Family)
     Uragus Rafinesque, 1815 accepted as Uragus Rafinesque, 1815 (nomen nudum)· Animalia (Kingdom) > Cnidaria (Phylum) > Cnidaria (awaiting allocation) (Class) > Cnidaria (awaiting allocation) (Order) > Cnidaria (awaiting allocation) (Family)
     Uragus Guérin-Méneville, 1844 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Cerambycidae (Family)

Uralella
     Uralella K.B. Korde, 1957 † · Plantae (Kingdom) > Chlorophyta (Phylum) > Ulvophyceae (Class) > Dasycladales (Order) > Dasycladaceae (Family)
     Uralella Makridin, 1960 † · Animalia (Kingdom) > Brachiopoda (Phylum) > Rhynchonellata (Class) > Terebratulida (Order) > Terebratulidae (Family)

Uralia
     Uralia Mulsant & Verreaux, 1866 (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Aves (Class) > Aves (awaiting allocation) (Order) > Aves (awaiting allocation) (Family)
     Uralia Lipina, 1939 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Chironomidae (Family)
     Uralia Kukalova-Peck & Sinichenkova, 1992 † (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Insecta (awaiting allocation) (Order) > Insecta (awaiting allocation) (Family)
     Uralia Martynova, 1976 † (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Collembola (Class) > (Order) > Collembola (awaiting allocation) (Family)
 Uralia Licharew, 1925 † accepted as Eolyttonia Fredericks, 1924 † · Animalia (Kingdom) > Brachiopoda (Phylum) > Strophomenata (Class) > Productida (Order) > Lyttoniidae (Family)
     Uralia E.F. Tschirkova-Zalesskaja, 1957 † (uncertain)· Plantae (Kingdom) > Tracheophyta (Phylum) > Trimerophytopsida (Class) > Trimerophytales (Order) > Trimerophytales (awaiting allocation) (Family)

Uralina
 Uralina Schuchert & Le Vene, 1929 † accepted as Eolyttonia Fredericks, 1924 † · Animalia (Kingdom) > Brachiopoda (Phylum) > Strophomenata (Class) > Productida (Order) > Lyttoniidae (Family)
 Uralina Rozhdestvenskaya, 1962 † accepted as Uralinova Kempf, 2015 † · Animalia (Kingdom) > Arthropoda (Phylum) > Ostracoda (Class) > Ostracoda (awaiting allocation) (Order) > Gotlandellidae (Family)

Uralites
     Uralites Tchernov, 1907 (uncertain)· Animalia (Kingdom) > Mollusca (Phylum) > Mollusca (awaiting allocation) (Class) > Mollusca (awaiting allocation) (Order) > Mollusca (awaiting allocation) (Family)
     Uralites B.I. Tchuvashov, 1973 † · Plantae (Kingdom) > Algae incertae sedis (Phylum) > Algospongia (Class) > Moravamminales (Order) > Uralitaceae (Family)

Uralophyllum
     Uralophyllum A.N. Kristofovic, 1933 † (uncertain)· Plantae (Kingdom) > Plantae (awaiting allocation) (Phylum) > Plantae (awaiting allocation) (Class) > Plantae (awaiting allocation) (Order) > Plantae (awaiting allocation) (Family)
     Uralophyllum Sochkina, 1936 † (uncertain)· Animalia (Kingdom) > Cnidaria (Phylum) > Anthozoa (Class) > Rugosa (Order) > Digonophyllidae (Family)

Uralopora
     Uralopora Sokolov, 1951 † · Animalia (Kingdom) > Cnidaria (Phylum) > Anthozoa (Class) > Tabulata (Order) > Tabulata (awaiting allocation) (Family)
     Uralopora Sokolov, 1950 † accepted as Uralopora Sokolov, 1951 † (nomen nudum)· Animalia (Kingdom) > Cnidaria (Phylum) > Anthozoa (Class) > Tabulata (Order) > Tabulata (awaiting allocation) (Family)

Uramyia
 Uramyia Macquart, 1843 accepted as Uramya Robineau-Desvoidy, 1830 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Tachinidae (Family)
     Uramyia Agassiz, 1846 accepted as Uramya Robineau-Desvoidy, 1830 (unjustified emendation)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Tachinidae (Family)

Urana
     Urana Coelho & Nessimian, 1992 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Cicadellidae (Family)
     Urana Melichar, 1901 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Hemiptera (awaiting allocation) (Family)

Urania
     Urania Fabricius, 1807 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Uraniidae (Family)
 Urania A.P. de Candolle, 1855 accepted as Urania A.P. de Candolle, 1855 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Fabales (Order) > Fabaceae (Family)
 Urania Schreber, 1789 accepted as Ravenala Adanson, 1763 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Zingiberales (Order) > Strelitziaceae (Family)

Uranocentron
     Uranocentron Gray, 1831 (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Reptilia (Class) > Squamata (Order) > Tropiduridae (Family)
     Uranocentron Gray, 1840 accepted as Uranocentron Gray, 1840 (nomen nudum)· Animalia (Kingdom) > Chordata (Phylum) > Reptilia (Class) > Reptilia (awaiting allocation) (Order) > Reptilia (awaiting allocation) (Family)

Uranops
     Uranops Fitzinger, 1843 (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Reptilia (Class) > Reptilia (awaiting allocation) (Order) > Reptilia (awaiting allocation) (Family)
 Uranops Hemming, 1929 accepted as Lysandra Hemming, 1933 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Lycaenidae (Family)

Uranoscopus
     Uranoscopus Linnaeus, 1758 · Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Perciformes (Order) > Uranoscopidae (Family)
 Uranoscopus Gronow, 1763 accepted as Cottus Linnaeus, 1758 · Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Scorpaeniformes (Order) > Cottidae (Family)

Uranthera
 Uranthera Naudin, 1845 accepted as Acisanthera P. Browne, 1756 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Myrtales (Order) > Melastomataceae (Family)
 Uranthera Pax & K. Hoffmann in Engler, 1911 accepted as Phyllanthus Linnaeus, 1753 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Malpighiales (Order) > Phyllanthaceae (Family)

Uraptera
     Uraptera Billberg, 1820 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Lepidoptera (awaiting allocation) (Family)
 Uraptera Müller & Henle, 1837 accepted as Rioraja Whitley, 1939 · Animalia (Kingdom) > Chordata (Phylum) > Chondrichthyes (Class) > Rajiformes (Order) > Rajidae (Family)

Urartucoris
     Urartucoris Puchkov, 1979 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Coreidae (Family)
     Urartucoris Kment, Fent & Japoshvili, 2013 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Coreidae (Family)

Urasterella
     Urasterella M'Coy, 1851 † · Animalia (Kingdom) > Echinodermata (Phylum) > Asteroidea (Class) > Uractinida (Order) > Urasterellidae (Family)
     Urasterella Schuchert, 1914 † accepted as Urasterella M'Coy, 1851 † (unavailable name)· Animalia (Kingdom) > Echinodermata (Phylum) > Asteroidea (Class) > Uractinida (Order) > Urasterellidae (Family)

Urbanella
     Urbanella Schepotieff, 1912 (uncertain)· Protozoa (Kingdom) > (Phylum) > Protozoa (awaiting allocation) (Class) > (Order) > (Family)
 Urbanella Pierre, 1890 accepted as Pouteria Aublet, 1775 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Ericales (Order) > Sapotaceae (Family)
     Urbanella Malakhova, 1963 † accepted as Urbanellina Brenckle, 2022 † (junior homonym)· Chromista (Kingdom) > Retaria (Phylum) > Tubothalamea (Class) > Fusulinida (Order) > Endothyridae (Family)

Urbania
     Urbania Mikšič, 1963 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Scarabaeidae (Family)
     Urbania Hampson in Romanoff, 1901 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Lepidoptera (awaiting allocation) (Family)
 Urbania Vatke, 1875 accepted as Urbania Vatke, 1875 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Lamiales (Order) > Scrophulariaceae (Family)
 Urbania R.A. Philippi, 1891 accepted as Junellia Moldenke, 1940 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Lamiales (Order) > Verbenaceae (Family)

Urceola
     Urceola Roxburgh, 1799 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Gentianales (Order) > Apocynaceae (Family)
 Urceola Vandelli, 1788 accepted as Urceola Vandelli, 1788 · Plantae (Kingdom) > Plantae (awaiting allocation) (Phylum) > Plantae (awaiting allocation) (Class) > Plantae (awaiting allocation) (Order) > Plantae incertae sedis (Family)
     Urceola Quélet, 1886 · Fungi (Kingdom) > Ascomycota (Phylum) > Leotiomycetes (Class) > Helotiales (Order) > Helotiales incertae sedis (Family)

Urceolaria
 Urceolaria Molina, 1810 accepted as · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Lamiales (Order) > Gesneriaceae (Family)
     Urceolaria Bonorden, 1851 · Fungi (Kingdom) > Ascomycota (Phylum) > Pezizomycetes (Class) > Pezizales (Order) > Pezizales incertae sedis (Family)
 Urceolaria Molina ex J.D. Brandis, 1786 accepted as Urceolaria Molina ex J.D. Brandis, 1786 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Lamiales (Order) > Gesneriaceae (Family)
 Urceolaria Willdenow in Cothenius, 1790 accepted as Schradera Vahl, 1796 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Gentianales (Order) > Rubiaceae (Family)
 Urceolaria A.W. Jannsen, 2005 accepted as Cuvierina Boas, 1886 · Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Thecosomata (Order) > Cavoliniidae (Family)
 Urceolaria Herbert, 1821 accepted as Urceolina H.G.L. Reichenbach, 1829 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Asparagales (Order) > Amaryllidaceae (Family)
 Urceolaria Acharius, 1803 accepted as Diploschistes Norman, 1853 · Fungi (Kingdom) > Ascomycota (Phylum) > Lecanoromycetes (Class) > Ostropales (Order) > Thelotremataceae (Family)
 Urceolaria Hooker, 1821 accepted as Aspicilia A. Massalongo, 1852 · Fungi (Kingdom) > Ascomycota (Phylum) > Lecanoromycetes (Class) > Pertusariales (Order) > Megasporaceae (Family)
     Urceolaria Stein, 1854 · Chromista (Kingdom) > Ciliophora (Phylum) > Oligohymenophorea (Class) > Peritrichida (Order) > Urceolariidae (Family)
 Urceolaria Lamarck, 1801 accepted as Rotaria Scopoli, 1777 · Animalia (Kingdom) > Rotifera (Phylum) > Bdelloidea (Class) > Bdelloida (Order) > Philodinidae (Family)

Urceolina
     Urceolina H.G.L. Reichenbach, 1829 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Asparagales (Order) > Amaryllidaceae (Family)
 Urceolina Tuckerman, 1875 accepted as Orceolina Hertel, 1970 · Fungi (Kingdom) > Ascomycota (Phylum) > Lecanoromycetes (Class) > Agyriales (Order) > Trapeliaceae (Family)

Urceolus
 Urceolus Velenovský, 1939 accepted as Resupinatus C.G.D. Nees ex S.F. Gray, 1821 · Fungi (Kingdom) > Basidiomycota (Phylum) > Agaricomycetes (Class) > Agaricales (Order) > Tricholomataceae (Family)
     Urceolus C. von Mereschkowsky, 1879 · Protozoa (Kingdom) > Euglenozoa (Phylum) > Peranemea (Class) > Peranemida (Order) > Peranemidae (Family)

Urda
     Urda Münster, 1840 † · Animalia (Kingdom) > Arthropoda (Phylum) > Malacostraca (Class) > Isopoda (Order) > Isopoda (awaiting allocation) (Family)
     Urda Reiche in Sturm, 1843 accepted as Urda Reiche in Sturm, 1843 (nomen nudum)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Coleoptera (awaiting allocation) (Family)

Uresipedilum
     Uresipedilum Sasa & Okazawa, 1991 accepted as Uresipedilum Oyewo & Sæther, 1998 (nomen nudum)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Chironomidae (Family)
 Uresipedilum Sasa in Sasa & Kikuchi, 1995 accepted as Uresipedilum Oyewo & Sæther, 1998 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Chironomidae (Family)
 Uresipedilum Oyewo & Sæther, 1998 accepted as Polypedilum Kieffer, 1913 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Chironomidae (Family)

Uria
     Uria Kirby & Spence, 1828 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Lepidoptera (awaiting allocation) (Family)
     Uria Brisson, 1760 · Animalia (Kingdom) > Chordata (Phylum) > Aves (Class) > Charadriiformes (Order) > Alcidae (Family)
 Uria Möhring, 1758 accepted as Uria Brisson, 1760 · Animalia (Kingdom) > Chordata (Phylum) > Aves (Class) > Ciconiiformes (Order) > Laridae (Family)
     Uria Gistel, 1848 accepted as Phaleria Latreille, 1802 (junior homonym)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Tenebrionidae (Family)

Urnula
     Urnula E.M. Fries, 1849 · Fungi (Kingdom) > Ascomycota (Phylum) > Pezizomycetes (Class) > Pezizales (Order) > Sarcosomataceae (Family)
     Urnula Claparède & Lachmann, 1857 · Chromista (Kingdom) > Ciliophora (Phylum) > Phyllopharyngea (Class) > Suctorida (Order) > Urnulidae (Family)
 Urnula Wiesner, 1931 accepted as Ammopemphix Loeblich, 1952 · Chromista (Kingdom) > Retaria (Phylum) > Monothalamea (Class) > Astrorhizida (Order) > Hemisphaeramminidae (Family)

Urnularia
 Urnularia Stapf, 1901 accepted as Willughbeia Roxburgh, 1820 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Gentianales (Order) > Apocynaceae (Family)
 Urnularia P.A. Karsten, 1866 accepted as Chaetosphaeria L.R. Tulasne & C. Tulasne, 1863 · Fungi (Kingdom) > Ascomycota (Phylum) > Sordariomycetes (Class) > Chaetosphaeriales (Order) > Chaetosphaeriaceae (Family)

Urocentrum
     Urocentrum Nitzsch in Ersch & Gruber, 1827 · Chromista (Kingdom) > Ciliophora (Phylum) > Oligohymenophorea (Class) > Hymenostomatida (Order) > Urocentridae (Family)
 Urocentrum Wiegmann, 1835 accepted as Uracentron Kaup, 1827 · Animalia (Kingdom) > Chordata (Phylum) > Reptilia (Class) > Squamata (Order) > Tropiduridae (Family)

Urocentrus
 Urocentrus von Düben, 1845 accepted as Beryx Cuvier, 1829 · Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Beryciformes (Order) > Berycidae (Family)
 Urocentrus Kner, 1868 accepted as Pholis Scopoli, 1777 · Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Perciformes (Order) > Pholidae (Family)

Urocryptus
     Urocryptus Westwood, 1840 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Eupelmidae (Family)
 Urocryptus Temminck, 1838 accepted as Saccopteryx Illiger, 1811 · Animalia (Kingdom) > Chordata (Phylum) > Mammalia (Class) > Chiroptera (Order) > Emballonuridae (Family)

Uroctonoides
 Uroctonoides Chamberlin, 1920 accepted as Teuthraustes Simon, 1879 · Animalia (Kingdom) > Arthropoda (Phylum) > Arachnida (Class) > Scorpiones (Order) > Chactidae (Family)
 Uroctonoides Hoffmann, 1931 accepted as Paruroctonus Werner in Bronn, 1934 · Animalia (Kingdom) > Arthropoda (Phylum) > Arachnida (Class) > Scorpiones (Order) > Vaejovidae (Family)

Urocyclon
     Urocyclon Song & Wilbert, 2000 · Chromista (Kingdom) > Ciliophora (Phylum) > Oligohymenophorea (Class) > Scuticociliatida (Order) > Uronematidae (Family)
     Urocyclon Small & Lynn, 1985 accepted as Urocyclon Song & Wilbert, 2000 (nomen nudum)· Chromista (Kingdom) > Ciliophora (Phylum) > Oligohymenophorea (Class) > Scuticociliatida (Order) > Uronematidae (Family)

Urocystis
     Urocystis Villot, 1880 · Animalia (Kingdom) > Platyhelminthes (Phylum) > Cestoda (Class) > Cyclophyllidea (Order) > Hymenolepididae (Family)
     Urocystis Rabenhorst ex Fuckel, 1870 · Fungi (Kingdom) > Basidiomycota (Phylum) > Ustilaginomycetes (Class) > Urocystidiales (Order) > Urocystidaceae (Family)

Urodiscus
     Urodiscus Sclater, 1860 (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Aves (Class) > Aves (awaiting allocation) (Order) > Aves (awaiting allocation) (Family)
 Urodiscus Berlese, 1917 accepted as Nenteria Oudemans, 1915 · Animalia (Kingdom) > Arthropoda (Phylum) > Arachnida (Class) > Mesostigmata (Order) > Nenteriidae (Family)

Urodon
     Urodon Turczaninow, 1849 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Fabales (Order) > Fabaceae (Family)
 Urodon Schönherr, 1823 accepted as Bruchela Dejean, 1821 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Anthribidae (Family)

Urolepis
     Urolepis Walker, 1846 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Pteromalidae (Family)
     Urolepis Bellotti in Stoppani, 1857 † (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Pisces (awaiting allocation) (Class) > Pisces (awaiting allocation) (Order) > Pisces (awaiting allocation) (Family)
     Urolepis (A.P. de Candolle) R.M. King & H.E. Robinson, 1971 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Asterales (Order) > Asteraceae (Family)

Uroleptes
     Uroleptes Fitzinger, 1843 (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Reptilia (Class) > Reptilia (awaiting allocation) (Order) > Reptilia (awaiting allocation) (Family)
 Uroleptes Wagler, 1830 accepted as Tamandua Gray, 1825 · Animalia (Kingdom) > Chordata (Phylum) > Mammalia (Class) > Pilosa (Order) > Myrmecophagidae (Family)

Uroleptopsis
     Uroleptopsis Kahl, 1932 · Chromista (Kingdom) > Ciliophora (Phylum) > Spirotrichea (Class) > Urostylida (Order) > Pseudokeronopsidae (Family)
 Uroleptopsis Dragesco, 1970 accepted as Uroleptopsis Kahl, 1932 · Chromista (Kingdom) > Ciliophora (Phylum) > Spirotrichea (Class) > Hypotrichida (Order) > Holostichidae (Family)

Uromya
     Uromya Rollier, 1913 † (uncertain)· Animalia (Kingdom) > Mollusca (Phylum) > Mollusca (awaiting allocation) (Class) > Mollusca (awaiting allocation) (Order) > Mollusca (awaiting allocation) (Family)
     Uromya Rondani, 1856 accepted as Uromyia Meigen, 1838 (unjustified emendation)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Tachinidae (Family)

Uronectes
     Uronectes Bronn, 1850 † (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Malacostraca (Class) > Anaspidacea (Order) > Uronectidae (Family)
 Uronectes Günther, 1862 accepted as Liparis Scopoli, 1777 · Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Scorpaeniformes (Order) > Liparidae (Family)

Uronema
     Uronema Dujardin, 1841 · Chromista (Kingdom) > Ciliophora (Phylum) > Oligohymenophorea (Class) > Scuticociliatida (Order) > Uronematidae (Family)
     Uronema Lagerheim, 1887 · Plantae (Kingdom) > Chlorophyta (Phylum) > Chlorophyceae (Class) > Chaetophorales (Order) > Uronemataceae (Family)

Uronemus
     Uronemus Rafinesque, 1815 accepted as Uronemus Rafinesque, 1815 (nomen nudum)· Animalia (Kingdom) > Annelida (Phylum) > Polychaeta (Class) > Polychaeta (awaiting allocation) (Order) > Polychaeta (awaiting allocation) (Family)
     Uronemus Agassiz, 1844 † (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Dipnoi (Class) > (Order) > Uronemidae (Family)

Uronyx
     Uronyx Rafinesque, 1815 accepted as Uronyx Rafinesque, 1815 (nomen nudum)· Animalia (Kingdom) > Chordata (Phylum) > Reptilia (Class) > Reptilia (awaiting allocation) (Order) > Reptilia (awaiting allocation) (Family)
     Uronyx Rafinesque, 1832 (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Reptilia (Class) > Reptilia (awaiting allocation) (Order) > Reptilia (awaiting allocation) (Family)

Urophora
     Urophora Robineau-Desvoidy, 1830 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Tephritidae (Family)
     Urophora Gray, 1832 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Aetalionidae (Family)
 Urophora Sommerfelt ex Arnold, 1899 accepted as Bacidia G. De Notaris, 1846 · Fungi (Kingdom) > Ascomycota (Phylum) > Lecanoromycetes (Class) > Lecanorales (Order) > Ramalinaceae (Family)

Urophyllum
     Urophyllum Wallich in Roxburgh, 1824 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Gentianales (Order) > Rubiaceae (Family)
 Urophyllum K.H.E. Koch, 1857 accepted as Urospatha H.W. Schott, 1853 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Alismatales (Order) > Araceae (Family)

Uroplata
     Uroplata Chevrolat in Dejean, 1836 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Chrysomelidae (Family)
     Uroplata Guérin-Méneville, 1844 accepted as Uroplata Chevrolat in Dejean, 1836 (unavailable name)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Chrysomelidae (Family)

Uroptera
     Uroptera Rafinesque, 1815 accepted as Uroptera Rafinesque, 1815 (nomen nudum)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Lepidoptera (awaiting allocation) (Family)
     Uroptera Berthold in Latreille, 1827 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Brentidae (Family)

Uropterus
 Uropterus Lacordaire, 1866 accepted as Uroptera Berthold in Latreille, 1827 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Brentidae (Family)
 Uropterus Latreille, 1828 accepted as Uroptera Berthold in Latreille, 1827 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Brentidae (Family)

Uropteryx
     Uropteryx Agassiz, 1835 † (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Pisces (awaiting allocation) (Class) > Pisces (awaiting allocation) (Order) > Pisces (awaiting allocation) (Family)
 Uropteryx Agassiz, 1846 accepted as Ourapteryx Leach, 1814 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Geometridae (Family)

Urosoma
     Urosoma Spencer, 1930 † · Animalia (Kingdom) > Echinodermata (Phylum) > Ophiuroidea (Class) > Oegophiurida (Order) > Euzonosomatidae (Family)
     Urosoma Kowalewski, 1882 · Chromista (Kingdom) > Ciliophora (Phylum) > Spirotrichea (Class) > Hypotrichida (Order) > Oxytrichidae (Family)

Urospatha
     Urospatha H.W. Schott, 1853 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Alismatales (Order) > Araceae (Family)
     Urospatha Salvadori, ? 1869 (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Aves (Class) > Aves (awaiting allocation) (Order) > Aves (awaiting allocation) (Family)

Urospina
 Urospina Sellnick, 1932 accepted as Trichouropoda Berlese, 1916 · Animalia (Kingdom) > Arthropoda (Phylum) > Arachnida (Class) > Mesostigmata (Order) > Trematuridae (Family)
 Urospina von Gelei, 1944 accepted as Urospinula Corliss, 1960 · Chromista (Kingdom) > Ciliophora (Phylum) > Spirotrichea (Class) > Hypotrichida (Order) > Spirofilidae (Family)

Urospora
     Urospora J.E. Areschoug, 1866 · Plantae (Kingdom) > Chlorophyta (Phylum) > Ulvophyceae (Class) > Ulotrichales (Order) > Ulotrichaceae (Family)
     Urospora Schneider, 1875 · Chromista (Kingdom) > Miozoa (Phylum) > Paragregarea (Class) > Velocida (Order) > Urosporidae (Family)
 Urospora Fayod, 1889 accepted as Panellus P.A. Karsten, 1879 · Fungi (Kingdom) > Basidiomycota (Phylum) > Agaricomycetes (Class) > Agaricales (Order) > Mycenaceae (Family)
 Urospora Fabre, 1879 accepted as Urosporella G.F. Atkinson, 1897 · Fungi (Kingdom) > Ascomycota (Phylum) > Sordariomycetes (Class) > Xylariales (Order) > Xylariales incertae sedis (Family)

Urostylis
     Urostylis C.F. Meisner, 1839 (uncertain)· Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Asterales (Order) > Asteraceae (Family)
     Urostylis Westwood in Hope, 1837 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Urostylididae (Family)

Urotheca
     Urotheca Matthew, 1899 (uncertain)· Animalia (Kingdom) > Annelida (Phylum) > Annelida (awaiting allocation) (Class) > Annelida (awaiting allocation) (Order) > Annelida (awaiting allocation) (Family)
     Urotheca Cocteau & Bibron in Sagra, 1843 · Animalia (Kingdom) > Chordata (Phylum) > Reptilia (Class) > Squamata (Order) > Colubridae (Family)
 Urotheca Gilg in Engler & Prantl, 1897 accepted as Gravesia Naudin, 1851 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Myrtales (Order) > Melastomataceae (Family)

Urothemis
     Urothemis Brauer, 1868 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Odonata (Order) > Libellulidae (Family)
     Urothemis Hagen, 1875 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Odonata (Order) > Odonata (awaiting allocation) (Family)

Urotropis
     Urotropis Silvestri, 1896 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Diplopoda (Class) > Spirostreptida (Order) > Spirostreptidae (Family)
     Urotropis Jiménez de la Espada, 1875 (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Amphibia (Class) > Caudata (Order) > Plethodontidae (Family)
 Urotropis Rafinesque, 1822 accepted as Cryptobranchus Leuckart, 1821 · Animalia (Kingdom) > Chordata (Phylum) > Amphibia (Class) > Caudata (Order) > Cryptobranchidae (Family)

Uroxys
     Uroxys Westwood, 1843 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Scarabaeidae (Family)
     Uroxys Rafinesque, 1815 accepted as Uroxys Rafinesque, 1818 (nomen nudum)· Animalia (Kingdom) > Chordata (Phylum) > Chondrichthyes (Class) > Rajiformes (Order) > Rajidae (Family)
 Uroxys Rafinesque, 1818 accepted as Gymnura van Hasselt, 1823 · Animalia (Kingdom) > Chordata (Phylum) > Chondrichthyes (Class) > Rajiformes (Order) > Rajidae (Family)

Ursia
     Ursia Barnes & McDunnough, 1911 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Notodontidae (Family)
 Ursia I.T. Vassilczenko, 1979 accepted as Trifolium Linnaeus, 1753 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Fabales (Order) > Fabaceae (Family)

Ursina
     Ursina Jordan, 1964 † (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Ostracoda (Class) > Ostracoda (awaiting allocation) (Order) > Ostracoda (awaiting allocation) (Family)
     Ursina Sinev, 1988 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Stathmopodidae (Family)

Ursinella
 Ursinella O. Kuntze, 1891 accepted as · Plantae (Kingdom) > Charophyta (Phylum) > Zygnematophyceae (Class) > Desmidiales (Order) > Desmidiaceae (Family)
     Ursinella Eddy & McCollum, 1998 † · Animalia (Kingdom) > Arthropoda (Phylum) > Trilobita (Class) > Corynexochida (Order) > Corynexochida (awaiting allocation) (Family)

Urtica
     Urtica Linnaeus, 1753 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Rosales (Order) > Urticaceae (Family)
 Urtica Borlase, 1758 accepted as · Animalia (Kingdom) > Cnidaria (Phylum) > Anthozoa (Class) > Actiniaria (Order) > Actiniaria incertae sedis (Family)

Urus
 Urus C.H. Smith, 1827 accepted as Bos Linnaeus, 1758 · Animalia (Kingdom) > Chordata (Phylum) > Mammalia (Class) > Artiodactyla (Order) > Bovidae (Family)
 Urus Bojanus, 1827 accepted as Bison Smith, 1827 · Animalia (Kingdom) > Chordata (Phylum) > Mammalia (Class) > Artiodactyla (Order) > Bovidae (Family)
 Urus Swainson, 1835 † accepted as Bison Smith, 1827 · Animalia (Kingdom) > Chordata (Phylum) > Mammalia (Class) > Artiodactyla (Order) > Bovidae (Family)

Urvillea
     Urvillea Kunth in Humboldt, Bonpland & Kunth, 1821 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Sapindales (Order) > Sapindaceae (Family)
     Urvillea Kirkaldy, 1907 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Cixiidae (Family)

Usingeria
     Usingeria Schouteden, 1952 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Aradidae (Family)
 Usingeria Coetzee & Segerman, 1992 accepted as Rusingeria Coetzee & Kment, 2013 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Cimicidae (Family)

Usofila
     Usofila Marx, 1891 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Arachnida (Class) > Arachnida (awaiting allocation) (Order) > Arachnida (awaiting allocation) (Family)
     Usofila Keyserling, 1891 · Animalia (Kingdom) > Arthropoda (Phylum) > Arachnida (Class) > Araneae (Order) > Telemidae (Family)

Ussuria
     Ussuria Diener, 1895 † · Animalia (Kingdom) > Mollusca (Phylum) > Cephalopoda (Class) > Ceratitida (Order) > Ussuriidae (Family)
 Ussuria N.N. Tzvelev, 2001 accepted as · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Caryophyllales (Order) > Caryophyllaceae (Family)
     Ussuria S.I. Nevolina, 1984 † (uncertain)· Plantae (Kingdom) > Tracheophyta (Phylum) > Pinopsida (Class) > Pinopsida (awaiting allocation) (Order) > Pinopsida (awaiting allocation) (Family)
 Ussuria Nikolskii, 1903 accepted as Misgurnus Lacepède, 1803 · Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Cypriniformes (Order) > Cobitidae (Family)
 Ussuria Danilevsky, 1995 accepted as Ussurella Danilevsky, 1997 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Cerambycidae (Family)

Ussuriella
     Ussuriella Paramonow, 1929 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Rhagionidae (Family)
 Ussuriella Sosnina, 1956 † accepted as Kahlerina Kochansky-Devidé & Ramovs, 1955 † · Chromista (Kingdom) > Retaria (Phylum) > Tubothalamea (Class) > Fusulinida (Order) > Verbeekinidae (Family)

Usteria
     Usteria Willdenow in Cothenius, 1790 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Gentianales (Order) > Loganiaceae (Family)
 Usteria Medikus, 1790 accepted as · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Liliales (Order) > Liliaceae (Family)
 Usteria Cavanilles, 1793 accepted as · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Lamiales (Order) > Scrophulariaceae (Family)
 Usteria Batista & H. Maia, 1962 accepted as Mycousteria M.L. Farr, 1986 · Fungi (Kingdom) > Ascomycota (Phylum) > Ascomycota incertae sedis (Class) > Ascomycota incertae sedis (Order) > Ascomycota incertae sedis (Family)
 Usteria A.W. Dennstedt, 1818 accepted as Acalypha Linnaeus, 1753 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Malpighiales (Order) > Euphorbiaceae (Family)

Utahia
 Utahia N.L. Britton & Rose, 1922 accepted as Pediocactus N.L. Britton & J.N. Rose in N.L. Britton & A. Brown, 1913 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Caryophyllales (Order) > Cactaceae (Family)
     Utahia Gazin, 1958 † · Animalia (Kingdom) > Chordata (Phylum) > Mammalia (Class) > Primates (Order) > Omomyidae (Family)

Utania
     Utania G. Don, 1837 (uncertain)· Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Gentianales (Order) > Loganiaceae (Family)
     Utania Sukacheva, 1982 † (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Trichoptera (Order) > Trichoptera (awaiting allocation) (Family)

Ute
 Ute Dendy & Row, 1913 accepted as Ute Dendy & Row, 1913 · Animalia (Kingdom) > Porifera (Phylum) > Calcarea (Class) > Sycettida (Order) > Grantiidae (Family)
     Ute Schmidt, 1862 · Animalia (Kingdom) > Porifera (Phylum) > Calcarea (Class) > Sycettida (Order) > Grantiidae (Family)
 Ute Chun, 1889 accepted as Tinerfe Chun, 1898 · Animalia (Kingdom) > Ctenophora (Phylum) > Tentaculata (Class) > Cydippida (Order) > Haeckeliidae (Family)

Uterosomus
     Uterosomus Dejean, 1834 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Anthribidae (Family)
     Uterosomus Schönherr, 1839 accepted as Uterosomus Dejean, 1834 (nomen dubium)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Anthribidae (Family)

Utica
 Utica Hewitson, 1865 accepted as Theclinesthes Röber, 1892 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Lycaenidae (Family)
     Utica White, 1847 · Animalia (Kingdom) > Arthropoda (Phylum) > Malacostraca (Class) > Decapoda (Order) > Varunidae (Family)
     Utica White, 1847, nom. nud. accepted as Utica White, 1847 (nomen nudum)· Animalia (Kingdom) > Arthropoda (Phylum) > Malacostraca (Class) > Decapoda (Order) > Varunidae (Family)

Utinga
     Utinga Marcus, 1949 · Animalia (Kingdom) > Bryozoa (Phylum) > Gymnolaemata (Class) > Cheilostomatida (Order) > Petraliellidae (Family)
 Utinga Wilcox & Pimentel, 1989 accepted as Belemiana Ponting, 2021 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Mydidae (Family)

Utinomia
 Utinomia Galkin, 1986 accepted as Galkinius Perreault, 2014 · Animalia (Kingdom) > Arthropoda (Phylum) > Maxillopoda (Class) > Sessilia (Order) > Pyrgomatidae (Family)
     Utinomia Tomlinson, 1963 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Maxillopoda (Class) > Cirripedia (awaiting allocation) (Order) > Cirripedia (awaiting allocation) (Family)
 Utinomia Takeda & Tamura, 1981 accepted as Utinomiella Kropp & Takeda, 1988 · Animalia (Kingdom) > Arthropoda (Phylum) > Malacostraca (Class) > Decapoda (Order) > Cryptochiridae (Family)

Utraria
     Utraria (Quélet) Jeppson & E. Larsson, 2007 · Fungi (Kingdom) > Basidiomycota (Phylum) > Agaricomycetes (Class) > Agaricales (Order) > Agaricaceae (Family)
 Utraria Quélet, 1873 accepted as Lycoperdon Persoon, 1801 · Fungi (Kingdom) > Basidiomycota (Phylum) > Agaricomycetes (Class) > Agaricales (Order) > Agaricaceae (Family)

Utriculopsis
     Utriculopsis Sars, 1868 accepted as Utriculopsis M. Sars, 1870 (nomen nudum)· Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Cephalaspidea (Order) > Cylichnidae (Family)
 Utriculopsis M. Sars, 1870 accepted as Philine Ascanius, 1772 · Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Cephalaspidea (Order) > Philinidae (Family)

Utriculus
 Utriculus T. Brown, 1844 accepted as Retusa T. Brown, 1827 · Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Cephalaspidea (Order) > Retusidae (Family)
 Utriculus Schumacher, 1817 accepted as Conus Linnaeus, 1758 · Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Neogastropoda (Order) > Conidae (Family)

Uva
 Uva V.P. Maslov, 1956 † accepted as · Plantae (Kingdom) > Chlorophyta (Phylum) > Ulvophyceae (Class) > Bryopsidales (Order) > Codiaceae (Family)
     Uva Gray, 1842 accepted as Uva Gray, 1842 (nomen nudum)· Animalia (Kingdom) > Chordata (Phylum) > Mammalia (Class) > Mammalia (awaiting allocation) (Order) > Mammalia (awaiting allocation) (Family)
     Uva Playfair, 1914 · Plantae (Kingdom) > Chlorophyta (Phylum) > Chlorophyceae (Class) > Chlamydomonadales (Order) > Spondylomoraceae (Family)
 Uva O. Kuntze, 1891 accepted as Uvaria Linnaeus, 1753 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Magnoliales (Order) > Annonaceae (Family)

Uxia
     Uxia Walker, 1866 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Lepidoptera (awaiting allocation) (Family)
 Uxia Jousseaume, 1887 † accepted as Unitas Palmer in Harris & Palmer, 1947 † · Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Neogastropoda (Order) > Cancellariidae (Family)

Uzeliella
 Uzeliella Poppius, 1911 accepted as Poppiella Bergroth, 1911 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Miridae (Family)
 Uzeliella Bagnall, 1908 accepted as Aptinothrips Haliday, 1836 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Thysanoptera (Order) > Thripidae (Family)
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