Between brackets is the number of accepted species

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- Mollusca (133 359)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 098)
- Subclass Autobranchia (23 370)
- Infraclass Heteroconchia (16 695)
- Subterclass Archiheterodonta (1 219)
- Subterclass Euheterodonta (11 399)
- Superorder Anomalodesmata (990)
- Superorder Imparidentia (10 376)
- Order Adapedonta (263)
- Order Cardiida (3 057)
- Order Galeommatida (791)
- Order Gastrochaenida (43)
- Order Hiatellida represented as Adapedonta
- Order Hippuritida † (322)
- Order Lucinida (1 002)
- Order Megalodontida † (141)
- Superfamily Mecynodontoidea Haffer, 1959 † (3)
- Superfamily Megalodontoidea J. Morris & Lycett, 1853 † (138)
- Family Ceratomyopsidae L. R. Cox, 1964 † (2)
- Family Dicerocardiidae Kutassy, 1934 † (31)
- Genus Agelasina L. Riedel, 1933 † (1)
- Genus Cornucardia Koken, 1913 † (5)
- Genus Craspedodon Bittner, 1901 † accepted as Cornucardia Koken, 1913 †
- Genus Dicerocardium Stoppani, 1865 † (16)
- Species Dicerocardium baconicum Végh-Neubrandt, 1974 †
- Species Dicerocardium curionii Stoppani, 1865 †
- Subspecies Dicerocardium curionii cornutum Allasinaz, 1977 †
- Subspecies Dicerocardium curionii curionii Stoppani, 1865 †
- Species Dicerocardium dolomiticum (Loretz, 1875) †
- Species Dicerocardium eupalliatum Frech, 1904 † accepted as Paramegalodus eupalliatus (Frech, 1904) †
- Species Dicerocardium furcatolateratum Végh-Neubrandt, 1974 †
- Species Dicerocardium gemmellaroi Di Stefano, 1912 †
- Species Dicerocardium grimmingense Murban, 1952 †
- Species Dicerocardium himalayense Stoliczka, 1865 †
- Species Dicerocardium hungaricum Noszky, 1939 †
- Species Dicerocardium incisum Frech, 1909 † accepted as Rhaetomegalodon incisus (Frech, 1909) †
- Species Dicerocardium jani Stoppani, 1865 †
- Species Dicerocardium kuwagataforme Tamura, 1983 †
- Species Dicerocardium lancedellii Allasinaz, 1977 †
- Species Dicerocardium mediofasciatum Frech, 1904 † accepted as Neomegalodon mediofasciatus (Frech, 1904) †
- Species Dicerocardium pannonicum Oravecz, 1961 †
- Species Dicerocardium pteriiforme Végh-Neubrandt, 1963 †
- Species Dicerocardium ragazzonii Stoppani, 1865 †
- Species Dicerocardium teres Allasinaz, 1977 †
- Species Dicerocardium wulfeni (Hauer, 1855) †
- Genus Laubeia Bittner, 1895 † (1)
- Genus Physocardia Wöhrmann, 1893 † (8)
- Family Megalodontidae J. Morris & Lycett, 1853 † (84)
- Family Megalonidae J. Morris & Lycett, 1853 † accepted as Megalodontidae J. Morris & Lycett, 1853 †
- Family Pachyrismatidae Scarlato & Starobogatov, 1979 † (20)
- Family Wallowaconchidae Yancey & Stanley, 1999 † (1)
- Order Modiomorphida † (95)
- Order Myacea accepted as Myida
- Order Myida (925)
- Order Sphaeriida (661)
- Order Venerida (2 830)
- 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 † (102)
- Superfamily Kalenteroidea Marwick, 1953 † (46)
- 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 (4 076)
- Superorder Heteroconchia incertae sedis † (1)
- Infraclass Pteriomorphia (6 675)
- Subclass Bivalvia incertae sedis (7)
- Subclass Palaeotaxodonta accepted as Nuculida
- Subclass Paleoheterodonta accepted as Palaeoheterodonta
- Subclass Protobranchia (1 379)
- Infraclass Cryptodonta † (342)
- Class Caudofoveata (143)
- Class Cephalopoda (1 921)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (103 083)
- 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