Between brackets is the number of accepted species

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Shows the number of accepted species within the taxon
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- Mollusca (132 454)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (24 899)
- Subclass Autobranchia (23 188)
- Subclass Bivalvia incertae sedis (7)
- Subclass Palaeotaxodonta accepted as Nuculida
- Subclass Paleoheterodonta accepted as Palaeoheterodonta
- Subclass Protobranchia (1 362)
- Order Afghanodesmatida † (17)
- Superfamily Afghanodesmatoidea Scarlato & Starobogatov, 1979 † (7)
- Family Afghanodesmatidae Scarlato & Starobogatov, 1979 † (4)
- Family Eritropidae Cope, 2000 † (3)
- Genus Biseriodonta Z.-J. Fang & Cope, 2004 † (1)
- Genus Eritropis Pojeta & Gilbert-Tomlinson, 1977 † (2)
- Superfamily Tironuculoidea Babin, 1982 † (10)
- Order Manzanellida (40)
- Order Nuculanida (854)
- Order Nuculida (359)
- Order Protobranchia incertae sedis † (4)
- Order Solemyida (88)
- Infraclass Cryptodonta † (342)
- Class Caudofoveata (143)
- Class Cephalopoda (1 810)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 494)
- 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