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Mollusca (132 851)
Subphylum Aculifera
Subphylum Conchifera
Subphylum Placophora accepted as Polyplacophora
Superclass Aplacophora
Class Amphineura accepted as Aculifera
Class Bivalvia (25 013)
Class Caudofoveata (143)
Class Cephalopoda (1 834)
Class Conchifera accepted as Bivalvia
Class Cricoconarida † (1)
Class Gastropoda (102 753)
Subclass Amphigastropoda † (396)
Subclass Angiogastropoda represented as Gastropoda
Subclass Apogastropoda
Subclass Caenogastropoda (53 670)
Subclass Gastropoda incertae sedis (308)
Subclass Heterobranchia (39 172)
Infraclass "Lower Heterobranchia" (1 137)
Infraclass Euthyneura (37 449)
Subterclass Acteonimorpha (411)
Subterclass Ringipleura (2 917)
Subterclass Tectipleura (34 121)
Superorder Acochlidiimorpha (48)
Superorder Ascoglossa accepted as Sacoglossa
Superorder Basommatophora accepted as Hygrophila
Superorder Eupulmonata (25 585)
Order Aillyida accepted as Achatinina
Order Ellobiida (579)
Order Gymnomorpha accepted as Systellommatophora
Order Stylommatophora (24 782)
Suborder Achatinina (2 912)
Suborder Elasmognatha accepted as Succineoidei
Suborder Helicina (21 630)
Infraorder Arionoidei (140)
Infraorder Clausilioidei (1 859)
Infraorder Helicina incertae sedis (3 210)
Infraorder Helicoidei (5 691)
Infraorder Limacoidei (4 251)
Superfamily Dyakioidea Gude & B. B. Woodward, 1921 accepted as Trochomorphoidea Mörch, 1864
Superfamily Gastrodontoidea Tryon, 1866 (621)
Superfamily Helicarionoidea Bourguignat, 1877 (1 862)
Family Ariophantidae Godwin-Austen, 1883 (739)
Family Girasiidae Collinge, 1902 accepted as Girasiini Collinge, 1902
Family Gudeoconchidae Iredale, 1944 accepted as Helicarionidae Bourguignat, 1877
Family Helicarionidae Bourguignat, 1877 (650)
Family Myotestidae Collinge, 1902 accepted as Ostracolethinae Simroth, 1901
Family Urocyclidae Simroth, 1889 (467)
Subfamily Rhysotininae Schileyko, 2002 (3)
Subfamily Sheldoniinae Connolly, 1925 (1912) (394)
Subfamily Urocyclinae Simroth, 1889 (69)
Tribe Dendrolimacini Van Goethem, 1977 (10)
Tribe Leptichnini Van Goethem, 1977 (2)
Tribe Upembellini Van Goethem, 1977 (4)
Tribe Urocyclini Simroth, 1889 (53)
Genus Anisotoxon Van Goethem, 1975 (1)
Genus Atoxon Simroth, 1888 (7)
Species Atoxon aurantiacum Simroth, 1896 accepted as Atoxon pallens Simroth, 1896
Species Atoxon bruggeni Forcart, 1967 accepted as Atoxonoides bruggeni (Forcart, 1967)
Species Atoxon brunneum Simroth, 1896 accepted as Atoxon pallens Simroth, 1896
Species Atoxon carli Simroth, 1912 accepted as Atoxon pallens Simroth, 1896
Species Atoxon cavallii Pollonera, 1906
Species Atoxon cooksoni Forcart, 1967 accepted as Elisolimax flavescens (W. Keferstein, 1866)
Species Atoxon erlangeri Simroth, 1904 accepted as Atoxon hildebrandti Simroth, 1889
Species Atoxon faradjense Pilsbry, 1919 accepted as Atoxon pallens Simroth, 1896
Species Atoxon fasciatum Verdcourt, 1965 accepted as Pseudatoxon fasciatum (Verdcourt, 1965)
Species Atoxon flavum Simroth, 1896 accepted as Atoxon pallens Simroth, 1896
Species Atoxon fuelleborni Simroth, 1910
Species Atoxon hildebrandti Simroth, 1889
Species Atoxon kiboense Verdcourt, 1960
Species Atoxon lineatum Simroth, 1896 accepted as Atoxon hildebrandti Simroth, 1889
Species Atoxon martensi Simroth, 1910
Species Atoxon meridionalis Forcart, 1967 accepted as Atoxonoides meridionalis (Forcart, 1967)
Species Atoxon nairobiense Verdcourt, 1965 accepted as Atoxon kiboense Verdcourt, 1960
Species Atoxon ornatum Pollonera, 1906 accepted as Atoxon pallens Simroth, 1896
Species Atoxon pallens Simroth, 1896
Species Atoxon robustum Simroth, 1896 accepted as Atoxon hildebrandti Simroth, 1889
Species Atoxon schulzei Simroth, 1889
Species Atoxon taeniatum Simroth, 1896 accepted as Atoxon pallens Simroth, 1896
Species Atoxon variegatum Simroth, 1896 accepted as Atoxon pallens Simroth, 1896
Genus Atoxonoides Van Goethem, 1973 (3)
Genus Atrichotoxon Simroth, 1910 (2)
Genus Buettnerella Simroth, 1910 accepted as Buettneria Simroth, 1888
Genus Buettneria Simroth, 1888 (2)
Genus Bukobia Simroth, 1896 (8)
Genus Dendrotoxon Pollonera, 1911 accepted as Trichotoxon Simroth, 1888
Genus Diplotoxon Simroth, 1897 accepted as Trichotoxon Simroth, 1888
Genus Elisa Heynemann, 1883 accepted as Elisolimax T. D. A. Cockerell, 1893
Genus Elisolimax T. D. A. Cockerell, 1893 (11)
Genus Emphysetes Verdcourt, 2003 (1)
Genus Kirkia Pollonera, 1909 accepted as Elisolimax T. D. A. Cockerell, 1893
Genus Mesocyclus Pollonera, 1906 accepted as Bukobia Simroth, 1896
Genus Microcyclus Simroth, 1896 (1)
Genus Nuphus [sic] accepted as Nupnus Van Goethem, 1975
Genus Nupnus Van Goethem, 1975 (3)
Genus Parmarionopsis Piersanti, 1941 accepted as Atoxon Simroth, 1888
Genus Pembatoxon Van Goethem, 1975 (1)
Genus Phaneroporus Simroth, 1888 (2)
Genus Polytoxon Simroth, 1897 (1)
Genus Pseudatoxon Van Goethem, 1975 (1)
Genus Spirotoxon Simroth, 1897 accepted as Urocyclus J. E. Gray, 1864
Genus Stuhlmannia Simroth, 1895 accepted as Bukobia Simroth, 1896
Genus Tanzalimax Rowson, Paustian & Van Goethem, 2017 (2)
Genus Trichotoxon Simroth, 1888 (3)
Genus Udzungwalimax Rowson, Paustian & Van Goethem, 2017 (1)
Genus Urocyclina Dupouy, 1965 accepted as Elisolimax T. D. A. Cockerell, 1893
Genus Urocyclus J. E. Gray, 1864 (3)
Genus Koruella Pickford, 2019 † (1)
Genus Pilula E. von Martens, 1898 (3)
Genus Sagdellina Cossmann, 1889 † (3)
Superfamily Limacoidea Batsch, 1789 (365)
Superfamily Limacoidei incertae sedis (3)
Superfamily Parmacelloidea P. Fischer, 1856 (1855)
Superfamily Trochomorphoidea Mörch, 1864 (1 190)
Superfamily Zonitoidea Mörch, 1864 (118)
Family Milacidae Ellis, 1926 (55)
Family Parmacellidae P. Fischer, 1856 (1855) (26)
Family Trigonochlamydidae Hesse, 1882 (11)
Infraorder Oleacinoidei (497)
Infraorder Orthalicoidei (1 581)
Infraorder Partuloinei accepted as Pupilloidei
Infraorder Pupilloidei (3 436)
Infraorder Rhytidoidei (581)
Infraorder Sagdoinei accepted as Helicoidei
Infraorder Succineoidei (384)
Suborder Orthurethra accepted as Pupilloidei
Suborder Scolodontina (165)
Suborder Sigmurethra accepted as Helicina
Suborder Stylommatophora incertae sedis (75)
Order Systellommatophora (224)
Superorder Hygrophila (2 005)
Superorder Pneumopulmonata
Superorder Pylopulmonata (4 285)
Superorder Sacoglossa (391)
Superorder Siphonarimorpha (163)
Order Anaspidea accepted as Aplysiida
Order Aplysiida (101)
Order Aplysiomorpha accepted as Aplysiida
Order Archaeopulmonata accepted as Siphonarioidea Gray, 1827
Order Bullomorpha accepted as Cephalaspidea
Order Cephalaspidea (1 034)
Order Heterostropha accepted as Pyramidellidae J. E. Gray, 1840
Order Pteropoda (414)
Order Runcinacea accepted as Runcinida
Order Runcinida (80)
Order Tectibranchiata
Order Thecosomata
Order Umbraculida (15)
Superorder Euthyneura incertae sedis
Infraclass Heterobranchia incertae sedis (478)
Infraclass Mesoneura (108)
Infraclass Opisthobranchia
Infraclass Pulmonata
Subclass Neomphaliones accepted as Vetigastropoda
Subclass Neritimorpha (1 914)
Subclass Orthogastropoda represented as Gastropoda
Subclass Patellogastropoda (511)
Subclass Prosobranchia
Subclass Psilogastropoda represented as Gastropoda
Subclass Vetigastropoda (6 782)
Class Lamellibranchiata accepted as Bivalvia
Class Loricata accepted as Polyplacophora
Class Mollusca incertae sedis † (372)
Class Monoplacophora (229)
Class Pelecypoda accepted as Bivalvia
Class Polyplacophora (1 377)
Class Polyplaxiphora accepted as Polyplacophora
Class Rostroconchia † (64)
Class Scaphopoda (752)
Class Solenoconchia accepted as Scaphopoda
Class Solenogastres (313)
Subclass Chaetodermomorpha accepted as Caudofoveata