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Mollusca (133 313)
Subphylum Aculifera
Subphylum Conchifera
Subphylum Placophora accepted as Polyplacophora
Superclass Aplacophora
Class Amphineura accepted as Aculifera
Class Bivalvia (25 086)
Class Caudofoveata (143)
Class Cephalopoda (1 921)
Class Conchifera accepted as Bivalvia
Class Cricoconarida † (1)
Class Gastropoda (103 049)
Subclass Amphigastropoda † (434)
Subclass Angiogastropoda represented as Gastropoda
Subclass Apogastropoda
Subclass Caenogastropoda (53 849)
Subclass Gastropoda incertae sedis (313)
Subclass Heterobranchia (39 231)
Infraclass "Lower Heterobranchia" (1 140)
Infraclass Euthyneura (37 504)
Subterclass Acteonimorpha (413)
Subterclass Ringipleura (2 917)
Subterclass Tectipleura (34 174)
Superorder Acochlidiimorpha (48)
Superorder Ascoglossa accepted as Sacoglossa
Superorder Basommatophora accepted as Hygrophila
Superorder Eupulmonata (25 629)
Order Aillyida accepted as Achatinina
Order Ellobiida (579)
Order Gymnomorpha accepted as Systellommatophora
Order Stylommatophora (24 826)
Suborder Achatinina (2 912)
Suborder Elasmognatha accepted as Succineoidei
Suborder Helicina (21 674)
Infraorder Arionoidei (140)
Infraorder Clausilioidei (1 859)
Superfamily Clausilioidea J. E. Gray, 1855 (1 859)
Family Clausiliidae J. E. Gray, 1855 (1 762)
Subfamily Alopiinae A. J. Wagner, 1913 (434)
Subfamily Clausiliinae J. E. Gray, 1855 (288)
Subfamily Cochlodininae Lindholm, 1925 accepted as Cochlodinini Lindholm, 1925 (1923)
Subfamily Constrictinae H. Nordsieck, 1981 † (7)
Subfamily Eualopiinae H. Nordsieck, 1978 † (30)
Subfamily Euxininae I. M. Likharev, 1962 accepted as Clausiliinae J. E. Gray, 1855
Subfamily Garnieriinae C. R. Boettger, 1926 (61)
Subfamily Laminiferinae Wenz, 1923 (24)
Subfamily Mentissoideinae Lindholm, 1924 accepted as Mentissoideini Lindholm, 1924
Subfamily Neniinae Wenz, 1923 (14)
Subfamily Peruiniinae H. Nordsieck, 2005 (144)
Subfamily Phaedusinae A. J. Wagner, 1922 (758)
Tribe Caspiophaedusini H. Nordsieck, 2007 accepted as Serrulinini Ehrmann, 1927 (2)
Tribe Disjunctariini H. Nordsieck, 2014 † (13)
Tribe Nordsieckiini H. Nordsieck, 2007 † (8)
Tribe Phaedusini A. J. Wagner, 1922 (637)
Tribe Pontophaedusini H. Nordsieck, 2022 (3)
Tribe Pravispirini H. Nordsieck, 2007 accepted as Serrulinini Ehrmann, 1927
Tribe Serrulellini H. Nordsieck, 2007 † (20)
Genus Serrulastra H. Nordsieck, 1981 † (9)
Genus Serrulella H. Nordsieck, 1978 † (11)
Tribe Serrulinini Ehrmann, 1927 (31)
Tribe Synprosphymini H. Nordsieck, 2007 accepted as Synprosphyminae H. Nordsieck, 2007
Genus Excussispira Lindholm, 1925 (8)
Genus Graecophaedusa Rähle, 1982 (1)
Genus Serrulinella H. Nordsieck, 1984 (1)
Genus Synprosphyma A. J. Wagner, 1920 (34)
Subfamily Serrulininae Ehrmann, 1927 accepted as Serrulinini Ehrmann, 1927
Subfamily Synprosphyminae H. Nordsieck, 2007 accepted as Phaedusinae A. J. Wagner, 1922
Genus Cirrobasis Conrad, 1874 † (1)
Genus Dactylius F. Sandberger, 1872 † accepted as Filholia Bourguignat, 1877 †
Genus Dactylomorpha Gude, 1911 † accepted as Filholia Bourguignat, 1877 †
Genus Dextroformosana O. Boettger & Schmacker, 1894 accepted as Formosana O. Boettger, 1877
Genus Dextrospira Hrubesch, 1965 † (1)
Genus Distortiphaedusa Grego & Szekeres, 2011 accepted as Oospira (Distortiphaedusa) Grego & Szekeres, 2011
Genus Pirostoma Möllendorff, 1873 accepted as Macrogastra W. Hartmann, 1841
Family Filholiidae Wenz, 1923 † (82)
Family Palaeostoidae H. Nordsieck, 1986 † (15)
Infraorder Helicina incertae sedis (3 216)
Infraorder Helicoidei (5 698)
Infraorder Limacoidei (4 247)
Infraorder Oleacinoidei (497)
Infraorder Orthalicoidei (1 587)
Infraorder Partuloinei accepted as Pupilloidei
Infraorder Pupilloidei (3 466)
Infraorder Rhytidoidei (580)
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 (2 008)
Superorder Pneumopulmonata
Superorder Pylopulmonata (4 286)
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 (1 039)
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 (109)
Infraclass Opisthobranchia
Infraclass Pulmonata
Subclass Neomphaliones accepted as Vetigastropoda
Subclass Neritimorpha (1 916)
Subclass Orthogastropoda represented as Gastropoda
Subclass Patellogastropoda (517)
Subclass Prosobranchia
Subclass Psilogastropoda represented as Gastropoda
Subclass Vetigastropoda (6 789)
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 (1 381)
Class Polyplaxiphora accepted as Polyplacophora
Class Rostroconchia † (64)
Class Scaphopoda (754)
Class Solenoconchia accepted as Scaphopoda
Class Solenogastres (313)
Subclass Chaetodermomorpha accepted as Caudofoveata