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)
- Suborder Hippuritidina † (255)
- Suborder Requieniidina † (67)
- Superfamily Requienioidea Kutassy, 1934 † (67)
- Family Epidiceratidae Rengarten, 1950 † (46)
- Genus Eodiceras Pchelintsev, 1959 † accepted as Epidiceras Dechaseaux, 1952 †
- Genus Epidiceras Dechaseaux, 1952 † (22)
- Genus Heterodiceras Munier-Chalmas, 1870 † (12)
- Genus Megadiceras Pchelintsev, 1959 † accepted as Epidiceras Dechaseaux, 1952 †
- Genus Mesodiceras Pchelintsev, 1959 † accepted as Epidiceras Dechaseaux, 1952 †
- Species Mesodiceras borissjaki Pchelintsev, 1959 † accepted as Epidiceras borissjaki (Pchelintsev, 1959) †
- Species Mesodiceras enissalense Pchelintsev, 1959 † accepted as Epidiceras enissalense (Pchelintsev, 1959) †
- Species Mesodiceras posthumum Pchelintsev, 1959 † accepted as Epidiceras posthumum (Pchelintsev, 1959) †
- Species Mesodiceras sokolovi Pchelintsev, 1959 † accepted as Epidiceras sokolovi (Pchelintsev, 1959) †
- Species Mesodiceras valfinensiforme Pchelintsev, 1959 † accepted as Epidiceras valfinensiforme (Pchelintsev, 1959) †
- Genus Paradiceras Pchelintsev, 1959 † accepted as Epidiceras Dechaseaux, 1952 †
- Genus Plesiodiceras Munier-Chalmas, 1882 † (12)
- Family Heterodiceratidae Pchelintsev, 1959 † accepted as Epidiceratidae Rengarten, 1950 †
- Family Plesiodiceratidae Pchelintsev, 1959 † accepted as Epidiceratidae Rengarten, 1950 †
- Family Requieniidae Kutassy, 1934 † (21)
- 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)
- 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