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)
- Subterclass Euheterodonta (11 356)
- Superorder Anomalodesmata (987)
- Suborder Septibranchia
- Superfamily Anomalodesmata incertae sedis (4)
- Superfamily Clavagelloidea A. d'Orbigny, 1844 (34)
- Superfamily Cuspidarioidea Dall, 1886 (334)
- Superfamily Myochamoidea P. P. Carpenter, 1861 (55)
- Superfamily Pandoroidea Rafinesque, 1815 (86)
- Family Lyonsiidae P. Fischer, 1887 (37)
- Family Pandoridae Rafinesque, 1815 (49)
- Genus Calopodium Röding, 1798 accepted as Pandora Bruguière, 1797
- Genus Clidiophora P. P. Carpenter, 1864 (3)
- Genus Coania Valentich-Scott & Skoglund, 2010 (1)
- Genus Coelodon P. P. Carpenter, 1865 accepted as Frenamya Iredale, 1930
- Species Coelodon aversus Hedley, 1913 accepted as Frenamya elongata (P. P. Carpenter, 1865)
- Species Coelodon delicatulus P. P. Carpenter, 1865 accepted as Pandora bilirata Conrad, 1855
- Species Coelodon elongatus P. P. Carpenter, 1865 accepted as Frenamya elongata (P. P. Carpenter, 1865)
- Species Coelodon patulus Tate, 1889 accepted as Frenamya patula (Tate, 1889)
- Species Coelodon radians (Dall, 1915) accepted as Frenamya radians (Dall, 1915)
- Genus Foveadens Dall, 1915 (1)
- Genus Frenamya Iredale, 1930 (9)
- Genus Heteroclidus Dall, 1903 (1)
- Genus Kennerleya P. Fischer, 1887 accepted as Kennerlia P. P. Carpenter, 1864
- Genus Kennerleyia [sic] accepted as Kennerlia P. P. Carpenter, 1864
- Genus Kennerlia P. P. Carpenter, 1864 accepted as Pandora (Pandorella) Conrad, 1863
- Genus Kennerlyia [sic] accepted as Kennerlia P. P. Carpenter, 1864
- Genus Pandora Bruguière, 1797 (34)
- Genus Pandorella Conrad, 1863 accepted as Pandora (Pandorella) Conrad, 1863
- Genus Trutina T. Brown, 1827 accepted as Pandora Bruguière, 1797
- Family Spinolyonsiellidae Scarlato & Starobogatov, 1983 accepted as Lyonsiellidae Dall, 1895
- Superfamily Pholadomyoidea W. King, 1844 (59)
- Superfamily Poromyoidea Dall, 1886 (78)
- Superfamily Thracioidea Stoliczka, 1870 (1839) (165)
- Superfamily Verticordioidea Stoliczka, 1870 (148)
- Family Cercomyidae Crickmay, 1936 † accepted as Laternulidae Hedley, 1918 (1840)
- Family Laternulidae Hedley, 1918 (1840) (24)
- Superorder Imparidentia (10 336)
- 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 (4 072)
- 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