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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)
Superfamily Achatinoidea Swainson, 1840 (1 329)
Family Achatinidae Swainson, 1840 (1 232)
Subfamily Achatininae Swainson, 1840 (198)
Subfamily Callistoplepinae Mead, 1994 accepted as Callistoplepini Mead, 1994
Subfamily Coeliaxinae Pilsbry, 1907 (21)
Genus Balfouria Crosse, 1885 (7)
Genus Bathyaxis Ancey, 1887 accepted as Coeliaxis H. Adams & Angas, 1865
Genus Coeliaxis H. Adams & Angas, 1865 (2)
Genus Ischnocion Pilsbry, 1907 (2)
Species Ischnocion birabeni (Hylton Scott, 1946) accepted as Rectobelus birabeni (Hylton Scott, 1946)
Species Ischnocion conica Hausdorf, Kroll & López-Victoria, 2012
Species Ischnocion triptyx (Pilsbry, 1907)
Genus Microbeliscus Weyrauch, 1964 accepted as Nannobeliscus Weyrauch, 1967
Genus Nannobeliscus Weyrauch, 1967 (2)
Genus Neosubulina E. A. Smith, 1898 (3)
Genus Riebeckia E. von Martens, 1883 (5)
Genus Sphalerostoma Girard, 1892 accepted as Coeliaxis H. Adams & Angas, 1865
Subfamily Cryptelasminae Germain, 1916 (2)
Subfamily Glessulinae Godwin-Austen, 1920 (130)
Subfamily Limicolariinae Schileyko, 1999 accepted as Limicolariini Schileyko, 1999
Subfamily Opeatinae Thiele, 1931 (83)
Subfamily Petriolinae Schileyko, 1999 (214)
Subfamily Pyrgininae Germain, 1916 (2)
Subfamily Rishetiinae Schileyko, 1999 (53)
Subfamily Rumininae Wenz, 1923 (22)
Subfamily Stenogyrinae P. Fischer & Crosse, 1877 (76)
Subfamily Subulininae P. Fischer & Crosse, 1877 (425)
Subfamily Thyrophorellinae Girard, 1895 (1)
Genus Arabicolaria Harzhauser & Neubauer, 2016 † (3)
Genus Pacaudiella Harzhauser & Neubauer, 2016 † (2)
Family Aillyidae H. B. Baker, 1955 (2)
Family Ferrussacidae Bourguignat, 1883 accepted as Ferussaciidae Bourguignat, 1883
Family Ferussaciidae Bourguignat, 1883 (94)
Family Glessulidae Godwin-Austen, 1920 accepted as Glessulinae Godwin-Austen, 1920
Family Micractaeonidae Schileyko, 1999 (1)
Family Stenogyridae P. Fischer & Crosse, 1877 accepted as Stenogyrinae P. Fischer & Crosse, 1877
Family Subulinidae P. Fischer & Crosse, 1877 accepted as Subulininae P. Fischer & Crosse, 1877
Family Thyrophorellidae Girard, 1895 accepted as Thyrophorellinae Girard, 1895
Superfamily Streptaxoidea J. E. Gray, 1860 (1 571)
Suborder Elasmognatha accepted as Succineoidei
Suborder Helicina (21 626)
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