Between brackets is the number of accepted species

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- Mollusca (132 848)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 011)
- Subclass Autobranchia (23 297)
- 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)
- Superfamily Crassatelloidea A. Férussac, 1822 (413)
- Family Aenigmoconchidae Betekhtina, 1968 † (13)
- Family Astartidae A. d'Orbigny, 1844 (1840) (135)
- Family Crassatellidae A. Férussac, 1822 (250)
- Subfamily Crassatellinae (198)
- Subfamily Scambulinae Chavan, 1952 (17)
- Genus Crassinella Guppy, 1874 (13)
- Genus Mediraon H. E. Vokes, 1946 † (3)
- Species Mediraon divaricatum H. E. Vokes, 1946 †
- Species Mediraon secundum (Whitfield, 1891) †
- Species Mediraon undulatum Freneix, 1972 †
- Genus Pseuderiphyla P. Fischer, 1887 accepted as Crassinella Guppy, 1874
- Genus Remondia Gabb, 1869 † (1)
- Genus Crassatellites Krüger, 1823 † accepted as Crassatella Lamarck, 1799 (1)
- Genus Crassatina Kobelt, 1881 (16)
- Genus Crassovella Berezovsky, 2018 † (4)
- Genus Elsius M. Huber, 2015 (1)
- Genus Seendia R. Casey, 1961 † (2)
- Genus Spissatella Finlay, 1926 † (9)
- Genus Stearnsia C. A. White, 1887 †
- Genus Trigonocrassatella Freneix, 1972 † (1)
- Genus Triplicitella K. S. Collins, J. S. Crampton & M. Hannah, 2015 † (1)
- Family Crassatelloidea incertae sedis † (10)
- Family Myophoricardiidae Chavan, 1969 † (5)
- 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 (6 660)
- 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 (1 834)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 752)
- 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