Between brackets is the number of accepted species

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- Mollusca (133 272)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 082)
- Subclass Autobranchia (23 354)
- Infraclass Heteroconchia (16 678)
- Infraclass Pteriomorphia (6 676)
- Superorder Eupteriomorphia
- Order Arcida (1 227)
- Order Colpomyida † (6)
- Order Cyrtodontida † (67)
- Order Limida (359)
- Order Myalinida † (577)
- Order Mytilida (709)
- Order Ostreida (713)
- 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)
- Family Anningellidae Hodges, 2022 †
- Family Aviculidae Goldfuss, 1820 accepted as Pteriidae J. E. Gray, 1847 (1820)
- Family Bakevelliidae W. King, 1850 † (36)
- Genus Aguilerella Chavan, 1951 † (1)
- Genus Aguileria C. A. White, 1887 †
- Genus Alaperna Fürsich & Werner, 1989 † (1)
- Genus Bakevellia W. King, 1848 † (4)
- Genus Bakevelloides Tokuyama, 1959 †
- Genus Cassiavellia Tëmkin & Pojeta, 2010 † (2)
- Genus Costigervillia L. R. Cox & Arkell, 1948 †
- Genus Cultriopsis Cossmann, 1904 † accepted as Gervillia (Cultriopsis) Cossmann, 1904 †
- Genus Cuneigervillia L. R. Cox, 1955 † (1)
- Genus Dalliconcha C. A. White, 1887 † accepted as Gervillia Defrance, 1820 †
- Genus Gervilia [sic] † accepted as Gervillia Defrance, 1820 †
- Genus Gervillancea Skwarko, 1967 † (1)
- Genus Gervillaria L. R. Cox, 1955 † (7)
- Subgenus Gervillaria (Baryvellia) T. R. Waller, 2005 † represented as Gervillaria L. R. Cox, 1955 †
- Species Gervillaria (Baryvellia) ponderosa T. R. Waller, 2005 † represented as Gervillaria ponderosa T. R. Waller, 2005 †
- Species Gervillaria alaeformis (J. Sowerby, 1819) †
- Species Gervillaria allaudiensis (Matheron, 1843) †
- Species Gervillaria ashcroftensis (Crickmay, 1930) †
- Species Gervillaria neptuni (Goldfuss, 1837) †
- Species Gervillaria pallas (Leanza, 1942) †
- Species Gervillaria ponderosa T. R. Waller, 2005 †
- Species Gervillaria tibetica J.-R. Yin & Grant-Mackie, 2005 †
- Genus Gervilleia [sic] † accepted as Gervillia Defrance, 1820 †
- Genus Gervillella L. Waagen, 1907 † (6)
- Genus Gervillia Defrance, 1820 † (5)
- Genus Gevillella L. Waagen, 1907 † accepted as Gervillella L. Waagen, 1907 †
- Genus Goniodus Dunker, 1849 † (1)
- Genus Hoernesia Laube, 1866 †
- Genus Kobayashites Hayami, 1959 † (2)
- Genus Langsonella Patte, 1962 †
- Genus Pelsia Dominici & Danise, 2024 † (1)
- Genus Songdaella Vukhuc, 1977 † (3)
- Genus Towapteria Nakazawa & Newell, 1968 † (1)
- Genus Virgellia Freneix, 1965 †
- Family Cassianellidae Ichikawa, 1958 † (8)
- Family Isognomonidae Woodring, 1925 (1828) (37)
- Family Kochiidae Frech, 1891 † (1)
- Family Malleidae Lamarck, 1818 (14)
- Family Margaritidae Blainville, 1824 (21)
- Family Melinidae Meek & Hayden, 1865 accepted as Isognomonidae Woodring, 1925 (1828)
- Family Pedalionidae Stephenson, 1923 accepted as Pteriidae J. E. Gray, 1847 (1820)
- Family Pergamidiidae L. R. Cox, 1964 † (3)
- Family Pernidae J. Fleming, 1828 accepted as Isognomonidae Woodring, 1925 (1828)
- Family Plicatostylidae Lupher & E. L. Packard, 1929 † (6)
- Family Pteriidae J. E. Gray, 1847 (1820) (60)
- Family Pulvinitidae Stephenson, 1941 (6)
- Family Reniellidae Iredale, 1939 accepted as Pteriidae J. E. Gray, 1847 (1820)
- Family Vlastidae Neumayr, 1891 † (2)
- Family Vulsellidae J. E. Gray, 1854 (34)
- Superfamily Rhombopterioidea Korobkov, 1960 † (3)
- Family Pterineidae Meek, 1864 † (101)
- Order Pectinida (3 008)
- 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 (1 379)
- Infraclass Cryptodonta † (342)
- Class Caudofoveata (143)
- Class Cephalopoda (1 917)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (103 017)
- 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 (753)
- Class Solenoconchia accepted as Scaphopoda
- Class Solenogastres (313)
- Subclass Chaetodermomorpha accepted as Caudofoveata