Between brackets is the number of accepted species

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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)
- Subclass Autobranchia (23 295)
- Infraclass Heteroconchia (16 637)
- Subterclass Archiheterodonta (1 208)
- Order Actinodontida † (196)
- Order Carditida (1 011)
- Superfamily Astartacea accepted as Crassatelloidea A. Férussac, 1822
- Superfamily Astartoidea A. d'Orbigny, 1844 accepted as Crassatelloidea A. Férussac, 1822
- Superfamily Carditoidea A. Férussac, 1822 (597)
- Family Cardiniidae Zittel, 1881 † (38)
- Family Carditidae A. Férussac, 1822 (491)
- Subfamily Carditamerinae Chavan, 1969 (46)
- Genus Byssomera Olsson, 1961 accepted as Carditamera Conrad, 1838
- Genus Carditamera Conrad, 1838 (14)
- Species Carditamera aequicostata (Cossmann, 1887) †
- Species Carditamera affinis (G. B. Sowerby I, 1833)
- Species Carditamera arata (Conrad, 1832) †
- Species Carditamera aspera (Lamarck, 1805) †
- Species Carditamera auingeri (M. Hörnes, 1864) †
- Species Carditamera bajaensis González & Giribet, 2012
- Species Carditamera contigua (Dautzenberg, 1910)
- Species Carditamera floridana Conrad, 1838
- Species Carditamera gracilis (Shuttleworth, 1856)
- Species Carditamera micella Penna-Neme, 1971 accepted as Cardites micellus (Penna-Neme, 1971)
- Species Carditamera plata (Ihering, 1907)
- Species Carditamera radiata (G. B. Sowerby I, 1833)
- Species Carditamera rolani Cosel, 1995
- Species Carditamera squamatina (Deshayes, 1858) †
- Species Carditamera valmondoisiensis (Morellet & Morellet, 1931) †
- Genus Centrocardita Sacco, 1899 (18)
- Genus Choniocardia Cossmann, 1904 † (7)
- Genus Glans Megerle von Mühlfeld, 1811 (7)
- Genus Lasaria J. E. Gray, 1854 accepted as Lazaria J. E. Gray, 1854
- Genus Lazaria J. E. Gray, 1854 accepted as Carditamera Conrad, 1838
- Subfamily Carditellinae Kuroda, Habe & Oyama, 1971 accepted as Condylocardiinae F. Bernard, 1896
- Subfamily Carditesinae Chavan, 1969 accepted as Venericardiinae Chavan, 1969
- Subfamily Carditinae A. Férussac, 1822 (66)
- Subfamily Condylocardiinae F. Bernard, 1896 accepted as Condylocardiidae F. Bernard, 1896
- Subfamily Cuninae Chavan, 1969 (80)
- Subfamily Miodomeridinae Chavan, 1969 (44)
- Subfamily Palaeocarditinae Chavan, 1969 † (3)
- Subfamily Scalaricarditinae D. E. Pérez, 2019 (63)
- Subfamily Thecaliinae Dall, 1903 (4)
- Subfamily Venericardiinae Chavan, 1969 (149)
- Genus Ainicardita Popov, 1983 † (2)
- Genus Carditella E. A. Smith, 1881 (21)
- Genus Chavanella Jaworski, 1939 † accepted as Miodomeris Chavan, 1938 †
- Genus Eomiodon Chavan, 1936 † accepted as Miodomeris Chavan, 1938 †
- Genus Fenestricardita R. Casey, 1961 † (1)
- Genus Hamacuna Cotton, 1931 (6)
- Genus Maghrebella Freneix, 1972 † (1)
- Genus Trapezicardita R. Casey, 1961 † (1)
- Genus Tutcheria L. R. Cox, 1946 † (4)
- Family Condylocardiidae F. Bernard, 1896 (68)
- Family Palaeocarditidae Chavan, 1969 † accepted as Palaeocarditinae Chavan, 1969 †
- Superfamily Crassatelloidea A. Férussac, 1822 (413)
- Family Archaeocardiidae Khalfin, 1940 †
- Family Eodonidae J. G. Carter, D. C. Campbell & M. R. Campbell, 2000 † (1)
- Order unranked_Archiheterodonta † (1)
- Subterclass Euheterodonta (11 356)
- Subterclass Heterodonta
- Subterclass Palaeoheterodonta (4 072)
- Superorder Heteroconchia incertae sedis † (1)
- Infraclass Pteriomorphia (6 658)
- 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 (1 834)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 697)
- 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