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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)
Superfamily Coelociontoidea Iredale, 1937 (5)
Superfamily Papillodermatoidea Wiktor, R. Martin & Castillejo, 1990 (1)
Superfamily Plectopyloidea Möllendorff, 1898 (144)
Superfamily Punctoidea E. S. Morse, 1864 (1 789)
Family Charopidae F. W. Hutton, 1884 (1 118)
Family Cystopeltidae T. D. A. Cockerell, 1891 (34)
Family Dipnelicidae Iredale, 1937 accepted as Charopidae F. W. Hutton, 1884
Family Discidae Thiele, 1931 (1866) (91)
Family Endodontidae Pilsbry, 1895 (225)
Family Flammulinidae Crosse, 1895 accepted as Flammulininae Crosse, 1895
Family Gonyodiscidae A. J. Wagner, 1928 accepted as Discidae Thiele, 1931 (1866)
Family Hedleyoconchidae Iredale, 1942 accepted as Charopidae F. W. Hutton, 1884
Family Helicodiscidae Pilsbry, 1927 (37)
Subfamily Helicodiscinae Pilsbry, 1927 (29)
Genus Chanomphalus Strebel & Pfeffer, 1879 (4)
Genus Helicodiscus E. S. Morse, 1864 (23)
Subgenus Helicodiscus (Hebetodiscus) H. B. Baker, 1929 represented as Helicodiscus E. S. Morse, 1864
Subgenus Helicodiscus (Helicodiscus) E. S. Morse, 1864 represented as Helicodiscus E. S. Morse, 1864
Subgenus Helicodiscus (Pseudiscus) J. P. E. Morrison, 1942 represented as Helicodiscus E. S. Morse, 1864
Species Helicodiscus (Pseudiscus) punctatellus J. P. E. Morrison, 1942 accepted as Helicodiscus punctatellus J. P. E. Morrison, 1942
Subgenus Helicodiscus (Troglodiscus) Hubricht, 1962 accepted as Helicodiscus E. S. Morse, 1864
Species Helicodiscus aldrichiana (G. H. Clapp, 1907) accepted as Helicodiscus aldrichianus (G. H. Clapp, 1907)
Species Helicodiscus aldrichianus (G. H. Clapp, 1907)
Species Helicodiscus apex (C. B. Adams, 1849)
Species Helicodiscus barri Hubricht, 1962
Species Helicodiscus bonamicus Hubricht, 1978
Species Helicodiscus diadema Grimm, 1967
Species Helicodiscus eichwaldi Prisyazhnyuk, 1972 † accepted as Helicodiscus roemeri (Andreae, 1902) †
Species Helicodiscus eiganmanni [sic] accepted as Helicodiscus eigenmanni Pilsbry, 1900
Species Helicodiscus eigenmanni Pilsbry, 1900
Species Helicodiscus enneodon Hubricht, 1965 accepted as Helicodiscus multidens Hubricht, 1962
Species Helicodiscus fimbriatus Wetherby, 1881
Species Helicodiscus hadenoecus Hubricht, 1962
Species Helicodiscus hexodon Hubricht, 1966
Species Helicodiscus lineatus (Say, 1817) accepted as Helicodiscus parallelus (Say, 1821)
Species Helicodiscus lirellus Hubricht, 1975
Species Helicodiscus multidens Hubricht, 1962
Species Helicodiscus notius Hubricht, 1962
Species Helicodiscus parallelus (Say, 1821)
Species Helicodiscus punctatellus J. P. E. Morrison, 1942
Species Helicodiscus ramsdeni Pilsbry, 1942
Species Helicodiscus roemeri (Andreae, 1902) †
Species Helicodiscus roundyi (J. P. E. Morrison, 1935)
Species Helicodiscus salmonaceus Hemphill, 1890
Species Helicodiscus saludensis (J. P. E. Morrison, 1937)
Species Helicodiscus shimeki Hubricht, 1962
Species Helicodiscus singleyanus (Pilsbry, 1890) accepted as Lucilla singleyana (Pilsbry, 1889)
Species Helicodiscus theresa Thiele, 1927 accepted as Helicodiscus parallelus (Say, 1821)
Species Helicodiscus tridens (J. P. E. Morrison, 1935)
Species Helicodiscus triodus Hubricht, 1958
Species Helicodiscus villosus D. C. Dourson, 2015
Genus Polygyriscus Pilsbry, 1948 (1)
Genus Speleodiscoides A. G. Smith, 1957 (1)
Subfamily Stenopylinae Thiele, 1931 (1)
Genus Hebetodiscus H. B. Baker, 1929 accepted as Helicodiscus (Hebetodiscus) H. B. Baker, 1929
Genus Hydrophrea Climo, 1974 accepted as Lucilla R. T. Lowe, 1852
Genus Lucilla R. T. Lowe, 1852 (7)
Family Laomidae Suter, 1913 accepted as Punctidae E. S. Morse, 1864
Family Oopeltidae T. D. A. Cockerell, 1891 (11)
Family Oreohelicidae Pilsbry, 1939 (68)
Family Paralaomidae Iredale, 1941 accepted as Punctidae E. S. Morse, 1864
Family Patulastridae Steenberg, 1925 accepted as Punctidae E. S. Morse, 1864
Family Patulidae Tryon, 1866 accepted as Discidae Thiele, 1931 (1866)
Family Phenacohelicidae Suter, 1892 accepted as Charopinae F. W. Hutton, 1884
Family Pseudocharopidae Iredale, 1944 accepted as Charopidae F. W. Hutton, 1884
Family Punctidae E. S. Morse, 1864 (203)
Family Trachycystidae Schileyko, 1986 accepted as Trachycystinae Schileyko, 1986
Genus Afrodontops Kadolsky, 2020 † (2)
Superfamily Testacelloidea J. E. Gray, 1840 (20)
Superfamily Urocoptoidea Pilsbry, 1898 (1868) (1 251)
Infraorder Helicoidei (5 690)
Infraorder Limacoidei (4 251)
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