Between brackets is the number of accepted species

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- Mollusca (132 888)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 022)
- Subclass Autobranchia (23 308)
- Infraclass Heteroconchia (16 648)
- Infraclass Pteriomorphia (6 660)
- Superorder Eupteriomorphia
- Order Arcida (1 227)
- Order Colpomyida † (6)
- Order Cyrtodontida † (66)
- Order Limida (358)
- Order Myalinida † (576)
- Superfamily Alatoconchoidea H. Termier, G. Termier & de Lapparent, 1974 †
- Superfamily Ambonychioidea S. A. Miller, 1877 † (71)
- Family Ambonychiidae S. A. Miller, 1877 † (30)
- Family Monopteriidae Newell, 1969 †
- Family Myalinidae Frech, 1891 † (27)
- Subfamily Myalininae Frech, 1891 † accepted as Myalinidae Frech, 1891 †
- Genus Anthracoptera Salter, 1862 † accepted as Naiadites J. W. Dawson, 1860 †
- Genus Liebea W. Waagen, 1881 † (1)
- Species Liebea hausmanni (Goldfuss, 1837) † accepted as Liebea squamosa (J. De C. Sowerby, 1829) †
- Species Liebea macros S.-F. Liang, 1980 †
- Species Liebea squamosa (J. De C. Sowerby, 1829) †
- Species Liebea zhenanensis B.-D. Shi, 1983 †
- Genus Mochovia Ragozin, 1956 † accepted as Myalina de Koninck, 1842 †
- Genus Myalina de Koninck, 1842 † (10)
- Genus Myalinella Newell, 1942 † (6)
- Genus Orthomyalina Newell, 1942 † (4)
- Genus Ossinoviella Ragozin, 1961 †
- Genus Papinella Scarlato & Starobogatov, 1979 † (3)
- Genus Promyalina Kittl, 1904 † (3)
- Genus Septimyalina Newell, 1942 †
- Family Mysidiellidae L. R. Cox, 1964 † (12)
- Family Ramonalinidae Yancey, M. A. Wilson & Mione, 2009 † (2)
- Superfamily Prokopievskioidea H. E. Vokes, 1967 † (505)
- Order Mytilida (707)
- Order Ostreida (706)
- 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 (1 838)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 777)
- 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