Between brackets is the number of accepted species

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- Mollusca (133 306)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 081)
- Subclass Autobranchia (23 353)
- Infraclass Heteroconchia (16 677)
- Subterclass Archiheterodonta (1 212)
- Subterclass Euheterodonta (11 390)
- Superorder Anomalodesmata (990)
- Order Laternulacea accepted as Thracioidea Stoliczka, 1870 (1839)
- Suborder Laternulina accepted as Thracioidea Stoliczka, 1870 (1839)
- Suborder Septibranchia
- Superfamily Anomalodesmata incertae sedis (4)
- Superfamily Clavagelloidea A. d'Orbigny, 1844 (34)
- Superfamily Cuspidarioidea Dall, 1886 (335)
- Superfamily Myochamoidea P. P. Carpenter, 1861 (55)
- Superfamily Pandoroidea Rafinesque, 1815 (86)
- Superfamily Pholadomyoidea W. King, 1844 (61)
- Superfamily Poromyoidea Dall, 1886 (78)
- Superfamily Thracioidea Stoliczka, 1870 (1839) (189)
- Family Burmesiidae Healey, 1908 † (1)
- Family Clistoconchidae B. Morton, 2012 (1)
- Family Laternulidae Hedley, 1918 (1840) (24)
- Family Osteodesmatidae Couthouy, 1839 accepted as Thraciidae Stoliczka, 1870 (1839)
- Family Periplomatidae Dall, 1895 (54)
- Family Thraciidae Stoliczka, 1870 (1839) (109)
- Subfamily Asthenothaerinae P. Fischer, 1887 accepted as Thraciidae Stoliczka, 1870 (1839)
- Subfamily Thraciinae Stoliczka, 1870 (1839) accepted as Thraciidae Stoliczka, 1870 (1839)
- Genus Alicia Angas, 1868 accepted as Thraciopsis Tate & May, 1900
- Genus Asthenothaerus P. P. Carpenter, 1864 (7)
- Genus Barythaerus B. A. Marshall, 2002 (2)
- Genus Bushia Dall, 1886 (4)
- Genus Cetothrax Iredale, 1949
- Genus Cyathodonta Conrad, 1849 (9)
- Genus Eximiothracia Iredale, 1924 accepted as Thracia (Odoncineta) O. G. Costa, 1830
- Genus Homoeodesma P. Fischer, 1887 accepted as Thracia (Homoeodesma) P. Fischer, 1887
- Genus Ixartia Leach, 1852 (1)
- Genus Lampeia MacGinitie, 1959 (3)
- Genus Odoncineta O. G. Costa, 1830 accepted as Thracia (Odoncineta) O. G. Costa, 1830
- Genus Osteodesma Blainville, 1827 accepted as Thracia Blainville, 1824
- Genus Parvithracia H. J. Finlay, 1926 (9)
- Genus Pelopia H. Adams, 1868 accepted as Pelopina M. Huber, 2010
- Genus Pelopina M. Huber, 2010 (2)
- Genus Phragmorisma Tate, 1894 (2)
- Genus Pseudocyathodonta Coan, 1990 (1)
- Genus Rupicola Fleuriau de Bellevue, 1802 accepted as Ixartia Leach, 1852
- Genus Skoglundia Coan, 1990 (1)
- Genus Thracia Blainville, 1824 (56)
- Genus Thracidentula Garrard, 1961 (1)
- Genus Thracidora Iredale, 1924 (3)
- Genus Thraciopsis Tate & May, 1900 (5)
- Genus Trigonothracia G. Yamamoto & Habe, 1959 (3)
- Species Trigonothracia jinxingae F.-S. Xu, 1980
- Species Trigonothracia mimica B. A. Marshall, 2002
- Species Trigonothracia pusilla (A. Gould, 1861)
- Superfamily Verticordioidea Stoliczka, 1870 (148)
- Family Cercomyidae Crickmay, 1936 † accepted as Laternulidae Hedley, 1918 (1840)
- Superorder Imparidentia (10 367)
- 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 (4 074)
- Superorder Heteroconchia incertae sedis † (1)
- Infraclass Pteriomorphia (6 676)
- 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 (103 047)
- 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