Between brackets is the number of accepted species

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- Mollusca (132 851)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 013)
- Subclass Autobranchia (23 299)
- Infraclass Heteroconchia (16 639)
- 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)
- Genus Balantioselena Speden, 1962 † (1)
- Genus Cardinia Agassiz, 1841 † (21)
- Genus Cypricardinia J. Hall, 1859 † (15)
- Genus Pachyodon Stutchbury, 1842 †
- Species Pachyodon agrestis T. Brown, 1843 † accepted as Carbonicola acuta (J. Sowerby, 1813) †
- Species Pachyodon aldamii T. Brown, 1843 † accepted as Carbonicola aldamii (T. Brown, 1843) †
- Species Pachyodon amygdala T. Brown, 1843 †
- Species Pachyodon antiquus T. Brown, 1843 † accepted as Carbonicola senex (T. Brown, 1849) †
- Species Pachyodon attenuatus Stutchbury, 1842 † accepted as Cardinia nilssoni (F. C. L. Koch & Dunker, 1837) †
- Species Pachyodon bipennis T. Brown, 1843 † accepted as Carbonicola bipennis (T. Brown, 1843) †
- Species Pachyodon blaydsii T. Brown, 1843 †
- Species Pachyodon dawsonae [sic] † accepted as Pachyodon dawsoni T. Brown, 1843 †
- Species Pachyodon dawsoni T. Brown, 1843 † accepted as Anthracosphaerium dawsoni (T. Brown, 1843) †
- Species Pachyodon dubius T. Brown, 1843 †
- Species Pachyodon embletoni T. Brown, 1843 † accepted as Carbonicola embletoni (T. Brown, 1843) †
- Species Pachyodon exoletus T. Brown, 1843 † accepted as Carbonicola acuta (J. Sowerby, 1813) †
- Species Pachyodon gerardi T. Brown, 1843 †
- Species Pachyodon hamatus T. Brown, 1843 †
- Species Pachyodon heyii T. Brown, 1843 †
- Species Pachyodon lanceolata Stutchbury, 1842 † accepted as Cardinia lanceolata (Stutchbury, 1842) †
- Species Pachyodon lateralis T. Brown, 1843 † accepted as Anthracosia lateralis (T. Brown, 1843) †
- Species Pachyodon levedensis T. Brown, 1843 † accepted as Carbonicola acuta (J. Sowerby, 1813) †
- Species Pachyodon nanus T. Brown, 1843 † accepted as Carbonicola similis (T. Brown, 1843) †
- Species Pachyodon nucleus T. Brown, 1843 †
- Species Pachyodon ovalis Stutchbury, 1842 † accepted as Cardinia ovalis (Stutchbury, 1842) †
- Species Pachyodon pyramidatus T. Brown, 1843 † accepted as Carbonicola pyramidata (T. Brown, 1843) †
- Species Pachyodon rhindii T. Brown, 1843 † accepted as Carbonicola rhindii (T. Brown, 1843) †
- Species Pachyodon rugosus T. Brown, 1843 † accepted as Carbonicola rugosa (T. Brown, 1843) †
- Species Pachyodon similis T. Brown, 1843 † accepted as Carbonicola similis (T. Brown, 1843) †
- Species Pachyodon smithii T. Brown, 1843 †
- Species Pachyodon subrotundus T. Brown, 1843 †
- Species Pachyodon subtriangularis T. Brown, 1843 † accepted as Carbonicola subtriangularis (T. Brown, 1843) †
- Species Pachyodon sulcatus T. Brown, 1843 † accepted as Carbonicola aquilina (J. De C. Sowerby, 1840) †
- Species Pachyodon transversus T. Brown, 1843 † accepted as Carbonicola acuta (J. Sowerby, 1813) †
- Species Pachyodon turgidus T. Brown, 1843 † accepted as Anthracosphaerium turgidum (T. Brown, 1843) †
- Species Pachyodon vetustus T. Brown, 1843 † accepted as Margaritana distorta (W. Bean, 1836) †
- Genus Thalassides Berger, 1833 †
- Genus Thalassites Berger, 1833 † accepted as Thalassides Berger, 1833 †
- Genus Torastarte Marwick, 1953 † (1)
- Family Carditidae A. Férussac, 1822 (491)
- 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 (11 358)
- 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 (102 753)
- 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