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Mollusca (132 888)
Subphylum Aculifera
Subphylum Conchifera
Subphylum Placophora accepted as Polyplacophora
Superclass Aplacophora
Class Amphineura accepted as Aculifera
Class Bivalvia (25 022)
Class Caudofoveata (143)
Class Cephalopoda (1 838)
Class Conchifera accepted as Bivalvia
Class Cricoconarida † (1)
Class Gastropoda (102 777)
Subclass Amphigastropoda † (396)
Subclass Angiogastropoda represented as Gastropoda
Subclass Apogastropoda
Subclass Caenogastropoda (53 684)
Subclass Gastropoda incertae sedis (309)
Subclass Heterobranchia (39 180)
Infraclass "Lower Heterobranchia" (1 137)
Infraclass Euthyneura (37 457)
Subterclass Acteonimorpha (411)
Subterclass Ringipleura (2 917)
Subterclass Tectipleura (34 129)
Superorder Acochlidiimorpha (48)
Superorder Ascoglossa accepted as Sacoglossa
Superorder Basommatophora accepted as Hygrophila
Superorder Eupulmonata (25 591)
Order Aillyida accepted as Achatinina
Order Ellobiida (579)
Order Gymnomorpha accepted as Systellommatophora
Order Stylommatophora (24 788)
Suborder Achatinina (2 912)
Suborder Elasmognatha accepted as Succineoidei
Suborder Helicina (21 636)
Infraorder Arionoidei (140)
Infraorder Clausilioidei (1 859)
Infraorder Helicina incertae sedis (3 210)
Infraorder Helicoidei (5 691)
Infraorder Limacoidei (4 251)
Infraorder Oleacinoidei (497)
Infraorder Orthalicoidei (1 587)
Infraorder Partuloinei accepted as Pupilloidei
Infraorder Pupilloidei (3 436)
Superfamily Achatinelloidea Gulick, 1873 accepted as Pupilloidea W. Turton, 1831
Superfamily Azecoidea H. Watson, 1920 (44)
Superfamily Chondrinoidea Steenberg, 1925 (183)
Superfamily Cionelloidea L. Pfeiffer, 1879 accepted as Cochlicopoidea Pilsbry, 1900 (1879)
Superfamily Cochlicopoidea Pilsbry, 1900 (1879) accepted as Pupilloidea W. Turton, 1831
Superfamily Dendropupoidea Wenz, 1938 † (11)
Superfamily Enoidea B. B. Woodward, 1903 (1880) accepted as Pupilloidea W. Turton, 1831
Superfamily Orculoidea Pilsbry, 1918 accepted as Pupilloidea W. Turton, 1831
Superfamily Partuloidea Pilsbry, 1900 accepted as Pupilloidea W. Turton, 1831
Superfamily Pupilloidea W. Turton, 1831 (3 198)
Family Achatinellidae Gulick, 1873 (337)
Family Agardhiellidae Harl & Páll-Gergely, 2017 (32)
Family Amastridae Pilsbry, 1910 (318)
Subfamily Amastrinae Pilsbry, 1910 (187)
Genus Amastra H. Adams & A. Adams, 1855 (144)
Genus Amastrella Sykes, 1900 accepted as Amastra (Amastrella) Sykes, 1900
Genus Armiella Hyatt, 1911 accepted as Amastra (Armiella) Hyatt, 1911
Genus Carelia H. Adams & A. Adams, 1855 (21)
Genus Cyclamastra Pilsbry & Vanatta, 1905 accepted as Amastra (Cyclamastra) Pilsbry & Vanatta, 1905
Genus Heteramastra Pilsbry, 1911 accepted as Amastra (Heteramastra) Pilsbry, 1911
Genus Kauaia Sykes, 1900 accepted as Amastra (Kauaia) Sykes, 1900
Genus Laminella L. Pfeiffer, 1854 (14)
Species Laminella alexandri (Newcomb, 1865)
Species Laminella aspera Baldwin, 1908
Species Laminella bulbosa (Gulick, 1858)
Species Laminella citrina (L. Pfeiffer, 1848)
Species Laminella concinna (Newcomb, 1854)
Species Laminella depicta (Baldwin, 1895)
Species Laminella duoplicata Baldwin, 1908 accepted as Laminella alexandri duoplicata Baldwin, 1908
Species Laminella gravida (Quoy & Gaimard, 1825)
Species Laminella kuhnsi (C. M. Cooke, 1908)
Species Laminella picta (Mighels, 1845)
Species Laminella remyi (Newcomb, 1855)
Species Laminella sanguinea (Newcomb, 1854)
Species Laminella semivenulata Borcherding, 1906 accepted as Laminella citrina (L. Pfeiffer, 1848)
Species Laminella straminea (Reeve, 1850)
Species Laminella tetrao (Newcomb, 1855)
Species Laminella venusta (Mighels, 1845)
Genus Metamastra Hyatt & Pilsbry, 1911 accepted as Amastra (Metamastra) Hyatt & Pilsbry, 1911
Genus Paramastra Hyatt & Pilsbry, 1911 accepted as Amastra (Paramastra) Hyatt & Pilsbry, 1911
Genus Planamastra Hyatt & Pilsbry, 1911 (3)
Genus Pterodiscus Pilsbry, 1893 accepted as Tropidoptera Ancey, 1889
Genus Tropidoptera Ancey, 1889 (5)
Subfamily Leptachatininae T. D. A. Cockerell, 1913 (131)
Family Argnidae Hudec, 1965 (16)
Family Cerastidae Wenz, 1923 (259)
Family Cerastuidae Wenz, 1930 accepted as Cerastidae Wenz, 1923
Family Chondrulidae A. J. Wagner, 1928 accepted as Chondrulini Wenz, 1923
Family Cionellidae L. Pfeiffer, 1879 accepted as Cochlicopidae Pilsbry, 1900 (1879)
Family Cochlicopidae Pilsbry, 1900 (1879) (22)
Family Cylindrovertillidae Iredale, 1940 accepted as Nesopupinae Steenberg, 1925
Family Draparnaudiidae Solem, 1962 (6)
Family Elasmiatidae Kuroda & T. Habe, 1949 accepted as Elasmiatini Kuroda & T. Habe, 1949
Family Enidae B. B. Woodward, 1903 (1880) (687)
Family Fauxulidae Harl & Páll-Gergely, 2017 (21)
Family Gastrocoptidae Pilsbry, 1918 (491)
Family Hypselostomatidae Zilch, 1959 accepted as Hypselostomatinae Zilch, 1959
Family Lauriidae Steenberg, 1925 (92)
Family Odontocycladidae Hausdorf, 1996 (2)
Family Orculidae Pilsbry, 1918 (85)
Family Pachnodidae Steenberg, 1925 accepted as Cerastidae Wenz, 1923
Family Pacificellidae Steenberg, 1925 accepted as Pacificellinae Steenberg, 1925
Family Pagodulinidae Pilsbry, 1924 (12)
Family Partulidae Pilsbry, 1900 (106)
Family Pleurodiscidae Wenz, 1923 (11)
Family Pupidae J. Fleming, 1822 accepted as Cerionidae Pilsbry, 1901
Family Pupillidae W. Turton, 1831 (140)
Family Pupisomatidae Iredale, 1940 accepted as Valloniidae E. S. Morse, 1864
Family Pupoididae Iredale, 1939 accepted as Pupoidinae Iredale, 1939
Family Pyramidulidae Kennard & B. B. Woodward, 1914 (19)
Family Spelaeoconchidae A. J. Wagner, 1928 (1)
Family Spelaeodiscidae Steenberg, 1925 (23)
Family Strobilidae Jooss, 1911 accepted as Strobilopsidae Wenz, 1915
Family Strobilopsidae Wenz, 1915 (85)
Family Tornatellinidae Sykes, 1900 accepted as Tornatellininae Sykes, 1900
Family Valloniidae E. S. Morse, 1864 (128)
Family Vertiginidae Fitzinger, 1833 (305)
Family Zuidae Bourguignat, 1884 accepted as Cochlicopidae Pilsbry, 1900 (1879)
Superfamily Vertiginoidea Fitzinger, 1833 accepted as Pupilloidea W. Turton, 1831
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 (1 036)
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 (6 783)
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