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Mollusca (132 791)
Subphylum Aculifera
Subphylum Conchifera
Subphylum Placophora accepted as Polyplacophora
Superclass Aplacophora
Class Amphineura accepted as Aculifera
Class Bivalvia (25 009)
Class Caudofoveata (143)
Class Cephalopoda (1 834)
Class Conchifera accepted as Bivalvia
Class Cricoconarida † (1)
Class Gastropoda (102 697)
Subclass Amphigastropoda † (390)
Subclass Angiogastropoda represented as Gastropoda
Subclass Apogastropoda
Subclass Caenogastropoda (53 636)
Subclass Gastropoda incertae sedis (308)
Subclass Heterobranchia (39 156)
Infraclass "Lower Heterobranchia" (1 137)
Infraclass Euthyneura (37 433)
Subterclass Acteonimorpha (411)
Subterclass Ringipleura (2 917)
Subterclass Tectipleura (34 105)
Superorder Acochlidiimorpha (48)
Superorder Ascoglossa accepted as Sacoglossa
Superorder Basommatophora accepted as Hygrophila
Superorder Eupulmonata (25 569)
Order Aillyida accepted as Achatinina
Order Ellobiida (579)
Order Gymnomorpha accepted as Systellommatophora
Order Stylommatophora (24 766)
Suborder Achatinina (2 900)
Suborder Elasmognatha accepted as Succineoidei
Suborder Helicina (21 626)
Infraorder Arionoidei (140)
Infraorder Clausilioidei (1 859)
Infraorder Helicina incertae sedis (3 210)
Infraorder Helicoidei (5 690)
Infraorder Limacoidei (4 251)
Superfamily Dyakioidea Gude & B. B. Woodward, 1921 accepted as Trochomorphoidea Mörch, 1864
Superfamily Gastrodontoidea Tryon, 1866 (621)
Family Daudebardiidae Kobelt, 1906 accepted as Daudebardiinae Kobelt, 1906
Family Gastrodontidae Tryon, 1866 (208)
Genus Aegopina Kobelt, 1879 accepted as Retinella P. Fischer, 1877
Genus Aegopinella Lindholm, 1927 (20)
Genus Alienitor Iredale, 1937 accepted as Zonitoides Lehmann, 1862
Genus Archaegopis Wenz, 1915 † (3)
Genus Atlantica Ancey, 1887 (2)
Genus Bermudia Ancey, 1887 accepted as Poecilozonites O. Boettger, 1884
Genus Edusa Albers, 1860 accepted as Mesomphix (Moreletia) J. E. Gray, 1855
Genus Gastrodonta Albers, 1850 (4)
Genus Glyphognomon H. B. Baker, 1930 accepted as Glyphyalinia E. von Martens, 1892
Genus Glyphyalinia E. von Martens, 1892 (24)
Genus Glyphyaloides H. B. Baker, 1930 accepted as Glyphyalus H. B. Baker, 1928
Genus Godwinia Sykes, 1900 (3)
Genus Janulus R. T. Lowe, 1852 (14)
Genus Juno Mazyck, 1889 accepted as Poecilozonites O. Boettger, 1884
Genus Mesomphix Rafinesque, 1819 (25)
Genus Namoitena Iredale, 1933 accepted as Mesomphix (Omphalina) Rafinesque, 1831
Genus Nesovitrea C. M. Cooke, 1921 (3)
Genus Omphalina Rafinesque, 1831 accepted as Mesomphix (Omphalina) Rafinesque, 1831
Genus Patulopsis Strebel & Pfeffer, 1879 (5)
Subgenus Patulopsis (Omphalinella) H. B. Baker, 1930 represented as Patulopsis Strebel & Pfeffer, 1879
Subgenus Patulopsis (Patulopsis) Strebel & Pfeffer, 1879 represented as Patulopsis Strebel & Pfeffer, 1879
Species Patulopsis (Patulopsis) carinatus Strebel, 1880 represented as Patulopsis carinatus Strebel, 1879
Species Patulopsis carinatus Strebel, 1879
Species Patulopsis montereyensis (Pilsbry, 1899)
Species Patulopsis salleana (E. von Martens, 1892)
Species Patulopsis sculptus (E. von Martens, 1892)
Species Patulopsis veracruzensis (L. Pfeiffer, 1857)
Genus Perpolita H. B. Baker, 1928 (16)
Genus Poecilozonites O. Boettger, 1884 (6)
Genus Politenella Balashov, 2016 accepted as Aegopinella Lindholm, 1927
Genus Pseudohyalina E. S. Morse, 1864 (5)
Genus Pseudohyalinia [sic] accepted as Pseudohyalina E. S. Morse, 1864
Genus Retinella P. Fischer, 1877 (19)
Genus Striatura E. S. Morse, 1864 (7)
Genus Striaturops H. B. Baker, 1928
Genus Ventridens W. G. Binney & Bland, 1869 (20)
Genus Vermetujanulus Walther & Groh, 2020 † (1)
Genus Vermetum Wollaston, 1878 (2)
Genus Vitrinizonites W. G. Binney, 1879 (1)
Genus Zonitellus H. B. Baker, 1928 accepted as Zonitoides Lehmann, 1862
Genus Zonitoides Lehmann, 1862 (28)
Family Oxychilidae Hesse, 1927 (1879) (216)
Family Pristilomatidae T. D. A. Cockerell, 1891 (197)
Family Vitreidae H. B. Baker, 1930 accepted as Pristilomatidae T. D. A. Cockerell, 1891
Subfamily Gastrodontinae Tryon, 1866 accepted as Gastrodontidae Tryon, 1866
Subfamily Oxychilinae Hesse, 1927 (1879) accepted as Oxychilidae Hesse, 1927 (1879)
Superfamily Helicarionoidea Bourguignat, 1877 (1 862)
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 (1 578)
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