Between brackets is the number of accepted species
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2 Shows the number of accepted species within the taxon
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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
- 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
- Family Acanthinulidae Steenberg, 1917 accepted as Valloniidae
- Family Acavidae Pilsbry, 1895
- Family Acavoidea (awaiting allocation)
- Family Achatinellidae Gulick, 1873
- Family Achatinidae Swainson, 1840
- Family Agriolimacidae H. Wagner, 1935
- Family Aillyidae
- Family Amastridae
- Family Ammonitellidae Pilsbry, 1930 accepted as Megomphicidae
- Family Amphibulimidae P. Fischer, 1873
- Family Anadenidae
- Family Anadromidae †
- Family Anastomopsidae †
- Family Argnidae
- Family Ariolimacidae
- Family Arionidae
- Family Ariophantidae Godwin-Austen, 1883
- Family Athoracophoridae
- Family Azecidae H. Watson, 1920
- Family Binneyidae
- Family Boettgerillidae
- Family Bothriembryontidae Iredale, 1937
- Family Bradybaenidae Pilsbry, 1934 (1898) accepted as Camaenidae Pilsbry, 1895
- Family Buliminidae Kobelt, 1880 accepted as Enidae Woodward, 1903
- Family Buliminusidae accepted as Enidae Woodward, 1903
- Family Bulimulidae Tryon, 1867
- Family Camaenidae Pilsbry, 1895
- Family Camaenoidea (awaiting allocation)
- Family Caryodidae
- Family Cepolidae Ihering, 1909
- Family Cerastidae Wenz, 1923
- Family Cerastuidae Wenz, 1930 accepted as Cerastidae Wenz, 1923
- Family Ceriidae accepted as Cerionidae Pilsbry, 1901
- Family Cerionidae Pilsbry, 1901
- Family Charopidae Hutton, 1884
- Family Chlamydephoridae
- Family Chondrinidae
- Family Chronidae
- Family Cionellidae L. Pfieffer, 1879
- Family Clausilidae accepted as Clausiliidae Gray, 1855
- Family Clausiliidae Gray, 1855
- Family Clausilioidea (awaiting allocation)
- Family Cochlicellidae Schileyko, 1972
- Family Cochlicopidae
- Family Coeliaxidae Pilsbry, 1907 accepted as Subulinidae P. Fischer & Crosse, 1877
- Family Coelociidae H. Nordsieck, 1986 accepted as Coelociontidae
- Family Coelociontidae
- Family Corillidae Pilsbry, 1905
- Family Cylindrellinidae †
- Family Cystopeltidae
- Family Daudebardiidae Kobelt, 1906 accepted as Oxychilidae Hesse in Geyer, 1927
- Family Diapheridae Panha & Naggs, 2010
- Family Discidae
- Family Dorcasiidae
- Family Draparnaudiidae
- Family Dyakiidae Gude & Woodward, 1921
- Family Echinichidae Thompson & Naranjo-García, 2012
- Family Elonidae Gittenberger, 1977
- Family Endodontidae
- Family Enidae Woodward, 1903
- Family Epiphragmophoridae Hoffmann, 1928
- Family Euconulidae H. B. Baker, 1928
- Family Eulotidae Möllendorff, 1898 accepted as Bradybaenidae Pilsbry, 1934 (1898)
- Family Ferrussaciidae accepted as Ferussaciidae Bourguignat, 1883
- Family Ferussaciidae Bourguignat, 1883
- Family Filholiidae †
- Family Gastrocoptidae Pilsbry, 1918
- Family Gastrodontidae Tryon, 1866
- Family Geomitridae Boettger, 1909
- Family Grangerellidae †
- Family Halolimnohelicidae
- Family Haplotrematidae
- Family Helicarionidae Bourguignat, 1877
- Family Helicarionoidea (awaiting allocation)
- Family Helicellidae H. Adams & A. Adams, 1855 accepted as Hygromiidae Tryon, 1866
- Family Helicidae Rafinesque, 1815
- Family Helicodiscidae
- Family Helicodontidae Kobelt, 1904
- Family Helixarionidae accepted as Helicarionidae Bourguignat, 1877
- Family Helixarionoidea (awaiting allocation)
- Family Helminthogliptidae accepted as Helminthoglyptidae
- Family Helminthoglyptidae
- Family Humboldtianidae
- Family Hygromiidae Tryon, 1866
- Family Hypselostomatidae Zilch, 1959
- Family Labyrinthidae Borrero, Sei, Robinson & Rosenberg, 2017
- Family Lauriidae Steenberg, 1925
- Family Limacidae Batsch, 1789
- Family Macrocyclidae
- Family Megalobulimidae Leme, 1973 accepted as Strophocheilidae Pilsbry, 1902
- Family Megaspiridae Pilsbry, 1904
- Family Megomphicidae
- Family Micractaeonidae
- Family Microceramidae Pilsbry, 1904 accepted as Urocoptidae
- Family Microcystidae Thiele, 1931
- Family Milacidae Ellis, 1926
- Family Monadeniidae
- Family Odontostomidae Pilsbry & Vanatta, 1898 accepted as Orthalicidae
- Family Oleacinidae
- Family Oleacinoidea (awaiting allocation)
- Family Oopeltidae
- Family Orculidae
- Family Oreohelicidae
- Family Orthalicidae
- Family Otoconchidae Cockerell, 1893 accepted as Charopidae Hutton, 1884
- Family Oxychilidae Hesse in Geyer, 1927
- Family Palaeostoidae †
- Family Papillodermatidae
- Family Parmacellidae
- Family Partulidae Pilsbry, 1900
- Family Patulidae Tryon, 1866 accepted as Discidae
- Family Philomycidae
- Family Placostylidae Pilsbry, 1946
- Family Plectopylidae
- Family Plectopylididae accepted as Plectopylidae
- Family Pleurodiscidae
- Family Pleurodontidae
- Family Polygyridae
- Family Pristilomatidae Cockerell, 1891
- Family Punctidae Morse, 1864
- Family Punctoidea incertae sedis
- Family Pupillidae Turton, 1831
- Family Pupilloidea (awaiting allocation)
- Family Pupilloidea incertae sedis
- Family Pyramidulidae Kennard & Woodward, 1914
- Family Rhytididae
- Family Sagdidae Pilsbry, 1895
- Family Scolodontidae
- Family Sculptariidae Degner, 1923
- Family Simpulopsidae Schileyko, 1999
- Family Solaropsidae H. Nordsieck, 1986 accepted as Pleurodontidae
- Family Spelaeoconchidae
- Family Spelaeodiscidae
- Family Sphincterochilidae Zilch, 1960
- Family Spiraxidae
- Family Staffordiidae
- Family Streptaxidae Gray, 1860
- Family Strobilopsidae
- Family Strophocheilidae Pilsbry, 1902
- Family Stylommatophora (awaiting allocation)
- Family Subulinidae P. Fischer & Crosse, 1877
- Family Succineidae Beck, 1837
- Genus Amphibia Berthold in Latreille, 1827 accepted as Succinea Draparnaud, 1801
- Genus Arborcinea Iredale, 1937
- Genus Austrosuccinea Iredale, 1937
- Genus Boninosuccinea Habe, 1956
- Genus Camptonyx Benson, 1858
- Genus Catinella Pease, 1870
- Genus Cerinasota Iredale, 1939
- Genus Helisaga Binney, 1879
- Genus Helisiga Lesson, 1831
- Genus Helisigna Gray, 1850
- Genus Hilolimax Paetel, 1875
- Genus Homalonix Corsi, 1900
- Genus Homalonyx Agassiz, 1846
- Genus Hyalimax H. Adams & A. Adams, 1855
- Genus Indosuccinea Rao, 1924
- Genus Laxisuccinea Cooke, 1921
- Genus Luccinea d'Orbigny, 1835 accepted as Succinea Draparnaud, 1801
- Genus Lucena Oken, 1815
- Genus Lucerna Hall, 1867
- Genus Neosuccinea Matekin, 1956
- Genus Novisuccinea Pilsbry, 1948
- Genus Omalonyx d'Orbigny, 1837
- Genus Oxyloma Westerlund, 1885
- Species Oxyloma decampi (Tryon, 1866)
- Species Oxyloma deprimidum Franzen, 1973
- Species Oxyloma effusum (Pfeiffer, 1853)
- Species Oxyloma groenlandicum (Moller, 1842)
- Species Oxyloma hawkinsi (Baird, 1863)
- Species Oxyloma haydeni (W.G. Binney, 1858)
- Species Oxyloma kanabense Pilsbry, 1948
- Species Oxyloma missoula Hubricht, 1982
- Species Oxyloma nuttallianum (I. Lea, 1841)
- Species Oxyloma peoriense (Wolf, 1894)
- Species Oxyloma retusum (I. Lea, 1834)
- Species Oxyloma salleanum (Pfeiffer, 1849)
- Species Oxyloma sillimani (Bland, 1865)
- Species Oxyloma subeffusum Pilsbry, 1948
- Species Oxyloma verrilli (Bland, 1865)
- Genus Papusuccinea Iredale, 1941
- Genus Papyrotheca Brusina, 1893 †
- Genus Quickella Böttger, 1939
- Genus Quickia Odhner, 1950
- Genus Spirancinea Iredale, 1945
- Genus Succinaea Deshayes, 1830 accepted as Succinea Draparnaud, 1801
- Genus Succinea Draparnaud, 1801
- Genus Suratia Hamilton-Bruce & Kear, 2010 †
- Genus Tapada Studer, 1820
- Family Systrophiidae Thiele, 1926 accepted as Scolodontidae
- Family Testacellidae
- Family Thyrophorellidae
- Family Thysanophoridae
- Family Trigonochlamydidae
- Family Trissexodontidae
- Family Trochomorphidae
- Family Urocoptidae
- Family Urocyclidae Simroth, 1889
- Family Valloniidae
- Family Vertiginidae Fitzinger, 1833
- Family Vidaliellidae Nordsieck, 1986 †
- Family Vitrinidae Fitzinger, 1833
- Family Xanthonychidae
- Family Zachrysiidae Robinson, Sei & Rosenberg, 2017
- Family Zonitidae
- Genus Laxecostula Harzhauser & Neubauer, 2020 †
- Genus Pseudotectonica Harzhauser & Neubauer, 2020 †
- 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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