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Mollusca (132 738)
Subphylum Aculifera
Subphylum Conchifera
Subphylum Placophora accepted as Polyplacophora
Superclass Aplacophora
Class Amphineura accepted as Aculifera
Class Bivalvia (24 984)
Class Caudofoveata (143)
Class Cephalopoda (1 830)
Class Conchifera accepted as Bivalvia
Class Cricoconarida † (1)
Class Gastropoda (102 673)
Subclass Amphigastropoda † (387)
Subclass Angiogastropoda represented as Gastropoda
Subclass Apogastropoda
Subclass Caenogastropoda (53 618)
Subclass Gastropoda incertae sedis (308)
Subclass Heterobranchia (39 153)
Infraclass "Lower Heterobranchia" (1 137)
Infraclass Euthyneura (37 430)
Subterclass Acteonimorpha (411)
Subterclass Ringipleura (2 917)
Subterclass Tectipleura (34 102)
Superorder Acochlidiimorpha (48)
Superorder Ascoglossa accepted as Sacoglossa
Superorder Basommatophora accepted as Hygrophila
Superorder Eupulmonata (25 566)
Order Aillyida accepted as Achatinina
Order Ellobiida (579)
Order Gymnomorpha accepted as Systellommatophora
Order Stylommatophora (24 763)
Suborder Achatinina (2 899)
Suborder Elasmognatha accepted as Succineoidei
Suborder Helicina (21 624)
Infraorder Arionoidei (139)
Infraorder Clausilioidei (1 859)
Infraorder Helicina incertae sedis (3 210)
Infraorder Helicoidei (5 690)
Infraorder Limacoidei (4 250)
Infraorder Oleacinoidei (497)
Infraorder Orthalicoidei (1 578)
Infraorder Partuloinei accepted as Pupilloidei
Infraorder Pupilloidei (3 436)
Infraorder Rhytidoidei (581)
Superfamily Acavoidea Pilsbry, 1895 accepted as Rhytidoidea Pilsbry, 1893
Superfamily Rhytidoidea Pilsbry, 1893 (581)
Family Acavidae Pilsbry, 1895 (141)
Family Ammonitellidae Pilsbry, 1930 accepted as Megomphicidae H. B. Baker, 1930
Family Anoglyptidae Iredale, 1937 accepted as Caryodidae Connolly, 1915
Family Aperidae Möllendorff, 1903 accepted as Chlamydephorinae T. D. A. Cockerell, 1935 (1903)
Family Caryodidae Connolly, 1915 (18)
Family Chlamydephoridae T. D. A. Cockerell, 1935 (1903) accepted as Chlamydephorinae T. D. A. Cockerell, 1935 (1903)
Family Clavatoridae Thiele, 1926 (20)
Family Corillidae Pilsbry, 1905 accepted as Corillinae Pilsbry, 1905
Family Dorcasiidae Connolly, 1915 (18)
Family Hedleyellidae Iredale, 1937 accepted as Caryodidae Connolly, 1915
Family Macrocyclidae Thiele, 1926 (1)
Family Megomphicidae H. B. Baker, 1930 (15)
Family Occirheneidae Iredale, 1939 accepted as Rhytidinae Pilsbry, 1893
Family Odontostomidae Pilsbry & Vanatta, 1898 (23)
Family Paryphantidae Godwin-Austen, 1893 accepted as Rhytidinae Pilsbry, 1893
Family Pedinogyridae Iredale, 1937 accepted as Caryodidae Connolly, 1915
Family Rhytididae Pilsbry, 1893 (216)
Family Strophocheilidae Pilsbry, 1902 (112)
Subfamily Megalobuliminae Leme, 1973 (72)
Genus Borus Albers, 1850 accepted as Megalobulimus K. Miller, 1878
Genus Megalobulimus K. Miller, 1878 (72)
Genus Phaiopharus Lange de Morretes, 1955 accepted as Megalobulimus K. Miller, 1878
Genus Psiloicus Lange de Morretes, 1952 accepted as Megalobulimus K. Miller, 1878
Subfamily Strophocheilidae incertae sedis (11)
Subfamily Strophocheilinae Pilsbry, 1902 (29)
Family Vidaliellidae H. Nordsieck, 1986 † (17)
Subfamily Acavinae Pilsbry, 1895 accepted as Acavidae Pilsbry, 1895
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