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Between brackets is the number of accepted species

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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)
Subclass Autobranchia (23 308)
Infraclass Heteroconchia (16 648)
Subterclass Archiheterodonta (1 208)
Subterclass Euheterodonta (11 366)
Superorder Anomalodesmata (987)
Superorder Imparidentia (10 346)
Order Adapedonta (262)
Order Cardiida (3 057)
Order Galeommatida (791)
Order Gastrochaenida (43)
Order Hiatellida represented as Adapedonta
Order Hippuritida † (322)
Order Lucinida (997)
Order Megalodontida † (141)
Order Modiomorphida † (94)
Order Myacea accepted as Myida
Order Myida (924)
Order Sphaeriida (662)
Order Venerida (2 826)
Superfamily Cyamioidea G. O. Sars, 1878 (98)
Superfamily Gaimardioidea Hedley, 1916 accepted as Cyamioidea G. O. Sars, 1878
Superfamily Galeommatacea accepted as Galeommatoidea J. E. Gray, 1840
Superfamily Grammysioidea S. A. Miller, 1877 † (90)
Family Grammysiidae S. A. Miller, 1877 † (38)
Family Sanguinolitidae S. A. Miller, 1877 † (52)
Subfamily Alulinae N. J. Morris, Dickins & Astafieva-Urbajtis, 1991 † (1)
Subfamily Chaenomyinae Waterhouse, 1966 † (3)
Subfamily Pholadellinae S. A. Miller, 1877 † (4)
Subfamily Sanguinolitinae S. A. Miller, 1877 † (26)
Subfamily Undulomyinae Astafieva-Urbajtis, 1983 † (5)
Genus Dyasmya N. J. Morris, Dickins & Astafieva-Urbajtis, 1991 † (1)
Genus Praeundulomya Dickins, 1957 † (3)
Species Praeundulomya concentrica Dickins, 1957 †
Species Praeundulomya curta Kanev, 1994 †
Species Praeundulomya multa Kanev, 1994 †
Genus Undulomya Fletcher, 1946 † (1)
Genus Dianolimnia F.-X. Guo, 1985 † (1)
Genus Leptodomus F. McCoy, 1844 † (2)
Genus Wilkingia R. B. Wilson, 1959 † (10)
Superfamily Kalenteroidea Marwick, 1953 † (39)
Superfamily Mactracea accepted as Mactroidea Lamarck, 1809
Order Anomalodesmacea accepted as Anomalodesmata
Order Euheterodonta incertae sedis (27)
Order Pholadomyida represented as Anomalodesmata
Family Lipanellidae T. M. Sánchez, 2005 † (4)
Family Rhaetidiidae Dominici & Danise, 2024 † (2)
Subterclass Heterodonta
Subterclass Palaeoheterodonta (4 073)
Superorder Heteroconchia incertae sedis † (1)
Infraclass Pteriomorphia (6 660)
Subclass Bivalvia incertae sedis (7)
Subclass Palaeotaxodonta accepted as Nuculida
Subclass Paleoheterodonta accepted as Palaeoheterodonta
Subclass Protobranchia (1 365)
Infraclass Cryptodonta † (342)
Class Caudofoveata (143)
Class Cephalopoda (1 838)
Class Conchifera accepted as Bivalvia
Class Cricoconarida † (1)
Class Gastropoda (102 777)
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

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