Between brackets is the number of accepted species
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2 Shows the number of accepted species within the taxon
3 The last expanded taxon is highlighted
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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
- 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
- Genus Anatomus A. Adams, 1862 accepted as Anatoma Woodward, 1859
- Genus Ariella Bandel, 1998 accepted as Sinezona Finlay, 1926
- Genus Coronadoa Bartsch, 1946
- Genus Daizona Bandel, 1998 † accepted as Sinezona Finlay, 1926
- Genus Incisura Hedley, 1904
- Genus Maxwellella Bandel, 1998 † accepted as Scissurella d'Orbigny, 1824
- Genus Praescissurella Lozouet, 1998 † accepted as Scissurella d'Orbigny, 1824
- Genus Reussella Bandel, 1998 † accepted as Scissurella d'Orbigny, 1824
- Genus Sahismope Paetel, 1875
- Genus Satondella Bandel, 1998
- Genus Schismope Jeffreys, 1856 accepted as Scissurella d'Orbigny, 1824
- Genus Schisomope Pilsbry in Tryon & Pilsbry, 1890
- Genus Scicurella Swainson, 1840 accepted as Scissurella d'Orbigny, 1824
- Genus Scissurella d'Orbigny, 1824
- Genus Scissurona Iredale, 1924 accepted as Incisura Hedley, 1904
- Genus Scisurella Thiele, 1928 accepted as Scissurella d'Orbigny, 1824
- Genus Sinezona Finlay, 1926
- Genus Sissurella Scacchi, 1836 accepted as Scissurella d'Orbigny, 1824
- Genus Sukashitrochus Habe & Kosuge, 1964
- Genus Triassurella Nützel & Geiger, 2006 †
- Genus Wodwardia Monterosato, 1884
- Genus Woodwardia Crosse & P. Fischer, 1861 accepted as Scissurella d'Orbigny, 1824
- 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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