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 (132 467)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (24 907)
- Subclass Autobranchia (23 195)
- Infraclass Heteroconchia (16 588)
- Subterclass Archiheterodonta (1 199)
- Subterclass Euheterodonta (11 320)
- Superorder Anomalodesmata (986)
- Superorder Imparidentia (10 301)
- Order Anomalodesmacea accepted as Anomalodesmata
- Order Euheterodonta incertae sedis (27)
- Order Pholadomyida represented as Anomalodesmata
- Family Lipanellidae T. M. Sánchez, 2005 † (4)
- Genus Lipanella T. M. Sánchez, 2005 † (1)
- Genus Paraphtonia Khalfin, 1958 † (3)
- Family Rhaetidiidae Dominici & Danise, 2024 † (2)
- Subterclass Heterodonta
- Subterclass Palaeoheterodonta (4 068)
- Superorder Heteroconchia incertae sedis † (1)
- Infraclass Pteriomorphia (6 607)
- Subclass Bivalvia incertae sedis (7)
- Subclass Palaeotaxodonta accepted as Nuculida
- Subclass Paleoheterodonta accepted as Palaeoheterodonta
- Subclass Protobranchia (1 363)
- Infraclass Cryptodonta † (342)
- Class Caudofoveata (143)
- Class Cephalopoda (1 813)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 496)
- 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