Between brackets is the number of accepted species
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- Biota
- Kingdom Animalia
- Phylum Acanthocephala
- Phylum Agmata †
- Phylum Animalia (awaiting allocation)
- Phylum Animalia incertae sedis
- Phylum Annelida
- Phylum Arthropoda
- Phylum Brachiopoda
- Phylum Bryozoa
- Phylum Cephalorhyncha incertae sedis
- Phylum Chaetognatha
- Phylum Chitinozoa †
- Phylum Chordata
- Phylum Cnidaria
- Phylum Ctenophora
- Phylum Cycliophora
- Phylum Cycloneuralia incertae sedis
- Phylum Ecdysozoa incertae sedis †
- Phylum Echinodermata
- Phylum Entoprocta
- Phylum Gastrotricha
- Phylum Gnathostomulida
- Phylum Hemichordata
- Phylum Hyolitha †
- Phylum Kinorhyncha
- Phylum Lobopoda †
- Phylum Loricifera
- Phylum Micrognathozoa
- Phylum Mollusca
- Class Aplacophora
- Class Bivalvia
- Class Calyptoptomatida †
- Class Camerothecida
- Class Cephalopoda
- Class Cricoconarida †
- Class Gastropoda
- Subclass Neritimorpha
- Subclass Neritimorpha incertae sedis
- Subclass Vetigastropoda
- Order Lepetellida
- Order Trochida
- Family Addisoniidae Dall, 1882
- Family Amberleyidae Wenz, 1938 †
- Family Anatomidae McLean, 1989
- Family Ataphridae Cossmann, 1918
- Family Auritomidae Szabó, Conti, Monari & Wendt, 2019 †
- Family Bathyphytophilidae Moskalev, 1978
- Family Catantostomatidae Wenz, 1938 †
- Family Caymanabyssiidae Marshall, 1986
- Family Cheeneetnukiidae Blodgett & Cook, 2002 †
- Family Chilodontaidae Wenz, 1938
- Family Chilodontidae Wenz, 1938 accepted as Chilodontaidae Wenz, 1938
- Family Choristellidae Bouchet & Warén, 1979 accepted as Lepetellidae Dall, 1881
- Family Cirridae Cossmann, 1916 †
- Family Clypeosectidae McLean, 1989 accepted as Lepetodrilidae McLean, 1988
- Family Cocculinellidae Moskalev, 1978
- Family Depressizonidae Geiger, 2003
- Family Discohelicidae Schröder, 1995 †
- Family Eotomariidae Wenz, 1938 †
- Family Eucyclidae Koken, 1896 †
- Family Eucycloscalidae Gründel, 2007 †
- Family Farewelliidae Mazaev, 2011 †
- Family Fissurellidae Fleming, 1822
- Genus Agariste Monterosato, 1892 †
- Genus Altrix Palmer, 1942
- Genus Amblychilepas Pilsbry in Tryon & Pilsbry, 1890
- Genus Arginula Palmer, 1937 †
- Genus Atractotrema Cossmann, 1888
- Genus Austroglyphis Cotton & Godfrey, 1934 accepted as Diodora J.E. Gray, 1821
- Genus Aviscutum Iredale, 1940 accepted as Scutus Montfort, 1810
- Genus Balboaina Pérez Farfante, 1943 accepted as Fissurella Bruguière, 1789
- Genus Buchanaania Gistl, 1848
- Genus Buchanania Lesson, 1831
- Genus Buchannia Gray, 1847
- Genus Capiluna Gray, 1857 accepted as Diodora J.E. Gray, 1821
- Genus Cemoria Risso, 1826 accepted as Puncturella Lowe, 1827
- Genus Cemoria Lowe, 1826
- Genus Clathrosepta McLean & Geiger, 1998
- Genus Clypidella Swainson, 1840
- Genus Clypidina Gray, 1847
- Genus Clypsidella Gray, 1847
- Genus Cornisepta McLean & Geiger, 1998
- Genus Cosmetalepas Iredale, 1924
- Genus Cranopsis A. Adams, 1860
- Genus Cremides H. Adams & A. Adams, 1854 accepted as Fissurella Bruguière, 1789
- Genus Cremoria Gray, 1842 accepted as Puncturella Lowe, 1827
- Genus Crepiemarginula Seguenza, 1880 † accepted as Zeidora A. Adams, 1860
- Genus Cypidina Paetel, 1888 accepted as Clypidina Gray, 1847
- Genus Dendrofissurella McLean & Kilburn, 1986
- Genus Deridobranchus Ehrenberg, 1831
- Genus Diadora Gray, 1847 † accepted as Diodora J.E. Gray, 1821
- Genus Diodora J.E. Gray, 1821
- Genus Dolichoschisma Iredale, 1940 accepted as Macroschisma Gray, 1835
- Genus Elegidion Iredale, 1924 accepted as Diodora J.E. Gray, 1821
- Genus Emargiluna Locard, 1884 accepted as Emarginula Lamarck, 1801
- Genus Emarginata Carpenter, 1859 accepted as Emarginula Lamarck, 1801
- Genus Emarginella Pilsbry in Tryon & Pilsbry, 1891
- Genus Emarginella accepted as Emarginula Lamarck, 1801
- Genus Emarginula Lamarck, 1801
- Genus Emarginulus Montfort, 1810 accepted as Emarginula Lamarck, 1801
- Genus Entomella Cotton, 1945 accepted as Emarginula Lamarck, 1801
- Genus Ephrada Gistl, 1848
- Genus Fissurella Bruguière, 1789
- Genus Fissurellida Schaufuss, 1869 accepted as Fissurellidea d'Orbigny, 1841
- Genus Fissurellidaea Gray, 1847 accepted as Fissurellidea d'Orbigny, 1841
- Genus Fissurellidea d'Orbigny, 1841
- Genus Fissurellidia Gray, 1840 accepted as Fissurellidea d'Orbigny, 1841
- Genus Fissurellus Montfort, 1810 accepted as Fissurella Bruguière, 1789
- Genus Fissuresepta Weinkauff, 1871 accepted as Fissurisepta Seguenza, 1863
- Genus Fissuridea Swainson, 1840 accepted as Diodora J.E. Gray, 1821
- Genus Fissurillea Gray, 1847
- Genus Fissurisepta Seguenza, 1863
- Genus Folia Palmer, 1937 † accepted as Altrix Palmer, 1942
- Genus Forolepas Iredale, 1940 accepted as Macroschisma Gray, 1835
- Genus Glyphis Carpenter, 1857 accepted as Diodora J.E. Gray, 1821
- Genus Glyptus Sowerby, 1916 accepted as Diodora J.E. Gray, 1821
- Genus Hemimarginula McLean, 2011
- Genus Hemitoma Swainson, 1840
- Genus Imarginula Gray, 1821 accepted as Emarginula Lamarck, 1801
- Genus Laeviemarginula Habe in Kuroda, 1953
- Genus Laevinesta Pilsbry & McGinty, 1952
- Genus Legrandia C. E. Beddome, 1883 accepted as Zeidora A. Adams, 1860
- Genus Leurolepas McLean, 1970
- Genus Loxotoma Fischer, 1885 † accepted as Palaeoloxotoma Hansen, 2019 †
- Genus Lucapina G. B. Sowerby I, 1835
- Genus Lucapinella Pilsbry in Tryon & Pilsbry, 1890
- Genus Macerochisma Paetel, 1875 accepted as Macroschisma Gray, 1835
- Genus Macrochisma Gray, 1840 accepted as Macroschisma Gray, 1835
- Genus Macroschisina Sykes, 1895 accepted as Macroschisma Gray, 1835
- Genus Macroschisma Gray, 1835
- Genus Macroschisma Agassiz, 1846 accepted as Macroschisma Gray, 1835
- Genus Manganesepta McLean & Geiger, 1998
- Genus Marginula Aradas, 1846-7 accepted as Emarginula Lamarck, 1801
- Genus Medusafissurella McLean & Kilburn, 1986
- Genus Megatabennus Krige, 1927 accepted as Megatebennus Pilsbry in Tryon & Pilsbry, 1890
- Genus Megatebennus Pilsbry in Tryon & Pilsbry, 1890 accepted as Fissurellidea d'Orbigny, 1841
- Genus Megathura Pilsbry in Tryon & Pilsbry, 1890
- Genus Monodilepas Finlay, 1926
- Genus Montfortia Récluz, 1843
- Genus Montfortista Iredale, 1929
- Genus Montfortula Iredale, 1915
- Genus Montfortulana Habe, 1961
- Genus Nannoscutum Iredale, 1937 accepted as Scutus Montfort, 1810
- Genus Nesta H. Adams, 1870 accepted as Zeidora A. Adams, 1860
- Genus Notomella Cotton, 1957 accepted as Emarginula Lamarck, 1801
- Genus Octomarginula McLean, 2011
- Genus Palaeoloxotoma Hansen, 2019 †
- Genus Parmaphorella Strebel, 1907
- Genus Parmaphorus Blainville, 1817 †
- Genus Parmophora Desmarest in Chenu, 1859 †
- Genus Parmophoridea Wenz, 1938 accepted as Parmaphorella Strebel, 1907
- Genus Parmophorus Blainville, 1817 † accepted as Scutus Montfort, 1810
- Genus Parmorphorus Woolworth (or ? Hall), 1867 †
- Genus Plagiorhytis P. Fischer, 1885 accepted as Montfortula Iredale, 1915
- Genus Pormophorus Vasseur, 1881 †
- Genus Profundisepta McLean & Geiger, 1998
- Genus Punctinella Carpenter, 1859 accepted as Puncturella Lowe, 1827
- Genus Puncturella Lowe, 1827
- Genus Pupillaea Gray, 1835
- Genus Retshitsella Mazaev, 1998 †
- Genus Rimula Defrance, 1827
- Genus Rimula Lowe, 1852
- Genus Rimulanax Iredale, 1924
- Genus Rimularia Bronn, 1838 accepted as Rimula Defrance, 1827
- Genus Rixa Iredale, 1924
- Genus Scelidotoma McLean, 1966
- Genus Scutina Bowdich, 1822 accepted as Scutus Montfort, 1810
- Genus Scutum Sowerby, 1842 accepted as Scutus Montfort, 1810
- Genus Scutum P. Fischer, 1885 accepted as Scutus Montfort, 1810
- Genus Scutus Montfort, 1810
- Genus Semperia Crosse, 1867 accepted as Emarginula Lamarck, 1801
- Genus Sipho T. Brown, 1827 accepted as Puncturella Lowe, 1827
- Genus Siphon Gray, 1847
- Genus Siphonella Issel, 1869 accepted as Montfortista Iredale, 1929
- Genus Sophismalepas Iredale, 1924 accepted as Amblychilepas Pilsbry in Tryon & Pilsbry, 1890
- Genus Stromboli Berry, 1954
- Genus Subemarginula Gray, 1847 accepted as Hemitoma Swainson, 1840
- Genus Subzeidora Iredale, 1924 accepted as Emarginula Lamarck, 1801
- Genus Sypho Brown, 1827
- Genus Tugala Schaufuss, 1869 accepted as Tugali Gray in Dieffenbach, 1843
- Genus Tugali Gray in Dieffenbach, 1843
- Genus Tugalia Gray, 1857 accepted as Tugali Gray in Dieffenbach, 1843
- Genus Tugalina Habe in Kuroda, 1953
- Genus Tugula Schaufuss, 1869 accepted as Tugali Gray in Dieffenbach, 1843
- Genus Vacerra Iredale, 1924 accepted as Vacerrena Iredale, 1958
- Species Vacerra demissa (Hedley, 1904) accepted as Puncturella demissa Hedley, 1904
- Genus Vacerrena Iredale, 1958
- Genus Variemarginula McLean, 2011
- Genus Zeidora A. Adams, 1860
- Genus Zidora P. Fischer, 1885 accepted as Zeidora A. Adams, 1860
- Family Gorgoleptidae McLean, 1988 accepted as Lepetodrilidae McLean, 1988
- Family Gosseletinidae Wenz, 1938 †
- Family Haliotidae Rafinesque, 1815
- Family Haliotididae accepted as Haliotidae Rafinesque, 1815
- Family Hormotomidae Wenz, 1938 †
- Family Kittlidiscidae †
- Family Larocheidae Finlay, 1927
- Family Laubellidae †
- Family Lepetellidae Dall, 1881
- Family Luciellidae Knight, 1956 †
- Family Melanodrymiidae Salvini-Plawen & Steiner, 1995
- Family Micromphalidae Harper, 2016 †
- Family Murchisoniidae Koken, 1896 †
- Family Neomphalidae McLean, 1981
- Family Osteopeltidae Marshall, 1987
- Family Pavlodiscidae †
- Family Peltospiridae McLean, 1989
- Family Pendromidae Warén, 1991
- Family Phanerotrematidae Knight, 1956 †
- Family Phymatopleuridae Batten, 1956 †
- Family Platyacridae Wenz, 1938 † accepted as Cirridae Cossmann, 1916 †
- Family Plethospiridae Wenz, 1938 † accepted as Hormotomidae Wenz, 1938 †
- Family Pleurotomariidae Swainson, 1840
- Family Pleurotomarioidea (awaiting allocation) †
- Family Polytremariidae Wenz, 1938 †
- Family Porcelliidae von Zittel, 1895 †
- Family Porcellioidea (awaiting allocation) †
- Family Portlockiellidae Batten, 1956 †
- Family Pseudococculinidae Hickman, 1983
- Family Pseudoturcicidae Bandel, 2010 †
- Family Pseudowortheniellidae Bandel, 2009 †
- Family Ptychocaulidae Mazaev, 2011 †
- Family Pyropeltidae McLean & Haszprunar, 1987
- Family Rhaphischismatidae Knight, 1956 †
- Family Rhaphistomellidae Bandel, 2009 †
- Family Schizogoniidae †
- Family Scissurellidae Gray, 1847
- Family Seguenziidae Verril, 1884
- Family Sinuspiridae Mazaev, 2011 †
- Family Stuorellidae Bandel, 2009 †
- Family Sutilizonidae McLean, 1989
- Family Temnocinclidae McLean, 1989
- Family Temnotropidae †
- Family Trachysmatidae Thiele, 1925 accepted as Pendromidae Warén, 1991
- Family Trochaclididae Thiele, 1928
- Family Trochoidea (awaiting allocation)
- Family Trochotomidae Cox, 1960 †
- Family Zygitidae †
- Genus Kelheimia Gründel & Nützel, 2024 †
- Subclass Vetigastropoda incertae sedis
- Order Acochlidiacea
- Order Acochlidioidea
- Order Allogastropoda †
- Order Anaspidea
- Order Archaeogastropoda
- Order Archaeopulmonata
- Order Architaenioglossa
- Order Architaenoglossa accepted as Architaenioglossa
- Order Basommatophora
- Order Basommatophora incertae sedis
- Order Bellerophontida †
- Order Caenogastropoda (awaiting allocation)
- Order Caenogastropoda incertae sedis
- Order Cephalaspidea
- Order Cocculiniformia
- Order Coenogastropoda incertae sedis
- Order Cylindrobullida
- Order Cyrtoneritimorpha †
- Order Docoglossa
- Order Ellobiida
- Order Eogastropoda
- Order Euomphalina †
- Order Eupulmonata incertae sedis
- Order Gastropoda (awaiting allocation)
- Order Gastropoda incertae sedis
- Order Gymnosomata
- Order Helicinoidea †
- Order Heterobranchia incertae sedis
- Order Heterostropha
- Order Heterostrophia accepted as Heterostropha
- Order Hygrophila
- Order Hypsogastropoda incertae sedis
- Order Littorinimorpha
- Order Macluritina †
- Order Mesogastropoda
- Order Mimospirida †
- Order Murchisoniina †
- Order Muricoidea
- Order Neogastropoda
- Order Neomphalina incertae sedis
- Order Neotaenioglossa
- Order Neritoina †
- Order Notaspidea
- Order Nudibranchia
- Order Opisthobranchia (awaiting allocation)
- Order Orthogastropoda (awaiting allocation) †
- Order Paragastropoda †
- Order Patellogastropoda
- Order Patellogastropoda incertae sedis
- Order Pleurobranchacea
- Order Pleurobranchomorpha
- Order Prosobranchia (awaiting allocation)
- Order Ptenoglossa
- Order Pulmonata (awaiting allocation)
- Order Pulmonata incertae sedis
- Order Runcinoidea
- Order Sacoglossa
- Order Sorbeoconcha
- Order Stenoglossa
- Order Stylommatophora
- Order Systellommatophora
- Order Thecosomata
- Order Tonnoidea
- Order Umbraculida
- Order Umbraculomorpha
- Class Helcionelloida †
- Class Mollusca (awaiting allocation)
- Class Mollusca incertae sedis
- Class Monoplacophora
- Class Paragastropoda †
- Class Polyplacophora
- Class Rostroconchia †
- Class Scaphopoda
- Class Stenothecoida †
- Class Tentaculita †
- Family Maikhanellidae Missarzhevsky, 1989 †
- Genus Lingulocaris Salter, 1866 †
- Genus Modiolocaris Peach in Jehu & Campbell, 1917 † accepted as Lingulocaris Salter, 1866 †
- Phylum Monoblastozoa accepted as Animalia incertae sedis
- Phylum Nematoda
- Phylum Nematomorpha
- Phylum Nemertea
- Phylum Onychophora
- Phylum Orthonectida
- Phylum Phoronida
- Phylum Placozoa
- Phylum Platyhelminthes
- Phylum Pogonophora accepted as Siboglinidae Caullery, 1914
- Phylum Porifera
- Phylum Priapula accepted as Priapulida
- Phylum Priapulida
- Phylum Problematica † accepted as Animalia incertae sedis
- Phylum Rhombozoa
- Phylum Rotifera
- Phylum Scalidophora incertae sedis
- Phylum Sipuncula
- Phylum Tardigrada
- Phylum Trace fossils †
- Phylum Vendobionta †
- Phylum Vestimentifera accepted as Siboglinidae Caullery, 1914
- Phylum Vetulicolia †
- Phylum Vinctiplicata incertae sedis †
- Phylum Xenacoelomorpha
- Genus Trilobocaris Pribyl, 1953 †
- Kingdom Archaea
- Kingdom Bacteria
- Kingdom Chromista
- Kingdom Fungi
- Kingdom Plantae
- Kingdom Protista accepted as Protozoa
- Kingdom Protozoa
- Kingdom Viruses
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