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)
- Infraclass Pteriomorphia (6 658)
- Superorder Eupteriomorphia
- Order Arcida (1 227)
- Order Colpomyida † (6)
- Order Cyrtodontida † (66)
- Order Limida (358)
- Order Myalinida † (576)
- Order Mytilida (706)
- Order Ostreida (705)
- Superfamily Ostreacea accepted as Ostreoidea Rafinesque, 1815
- Superfamily Ostreoidea Rafinesque, 1815 (243)
- Superfamily Pinnacea accepted as Pinnoidea Leach, 1819
- Superfamily Pinnoidea Leach, 1819 (138)
- Superfamily Pteriacea accepted as Pterioidea Gray, 1847 (1820)
- Superfamily Pterioidea Gray, 1847 (1820) (228)
- Superfamily Rhombopterioidea Korobkov, 1960 † (3)
- Family Pterineidae Meek, 1864 † (93)
- Genus Actinodesma Sandberger, 1856 † (2)
- Genus Actinopterella H. S. Williams, 1908 †
- Genus Actinopteria J. Hall, 1883 † (9)
- Genus Caneyella Girty, 1909 † (2)
- Genus Cobracephalus Whidborne, 1897 † accepted as Actinodesma (Actinodesma) Sandberger, 1856 †
- Genus Cornellites H. S. Williams, 1908 † (3)
- Genus Denticelox Pojeta & Gilbert-Tomlinson, 1977 † (1)
- Genus Ectenodesma J. Hall, 1883 † (2)
- Genus Eopterinea Z.-J. Fang & Cope, 2004 † (1)
- Genus Follmannella H. S. Williams, 1908 †
- Genus Glyptodesma J. Hall, 1883 †
- Genus Leiopteria J. Hall, 1883 † accepted as Leptodesma (Leiopteria) J. Hall, 1883 †
- Genus Leptodesma J. Hall, 1883 † (39)
- Genus Limoptera J. Hall, 1869 † (5)
- Genus Liopteria [sic] † accepted as Leiopteria J. Hall, 1883 †
- Genus Molinicola Liljedahl, 1984 † (7)
- Genus Newsomella Foerste, 1909 † (2)
- Genus Oxytomoidea Pojeta, R.-J. Zhang & Z.-Y. Yang, 1986 † (1)
- Genus Pegasella Caster, 1930 † (1)
- Genus Pterinea Goldfuss, 1832 † (2)
- Genus Pteronitella Billings, 1874 † (5)
- Genus Pteronites McCoy, 1844 † (3)
- Genus Ptychopteria J. Hall, 1883 † (5)
- Genus Tolmaia H. S. Williams, 1908 †
- Genus Wuxuanites Pojeta, R.-J. Zhang & Z.-Y. Yang, 1986 † (3)
- Order Pectinida (3 004)
- Order Pteriida accepted as Ostreida
- Order Pteriomorphia incertae sedis † (1)
- Superfamily Yunannioidea R.-J. Zhang & Z.-J. Niu, 2021 † (2)
- Family Ischyrodontidae Scarlato & Starobogatov, 1979 † (2)
- Family Matheriidae Scarlato & Starobogatov, 1979 † (1)
- Family Myodakryotidae Tunnicliff, 1987 † (4)
- 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