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 (132 851)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 013)
- Class Caudofoveata (143)
- Class Cephalopoda (1 834)
- Subclass Coleoidea (1 137)
- Superorder Ammonoida † (78)
- Order Agoniatitida †
- Order Ammonitida † (14)
- Suborder Ammonitina † (9)
- Suborder Ancyloceratina † (4)
- Suborder Haploceratina †
- Suborder Lytoceratina † (1)
- Suborder Phylloceratina †
- Order Ceratitida † (58)
- Order Clymeniida †
- Order Goniatitida †
- Order Phylloceratida † (3)
- Order Prolecanitida † (3)
- Superorder Bactritoidea †
- Superorder Decabrachia represented as Decapodiformes
- Superorder Decapodiformes (715)
- Superorder Octobrachia represented as Octopodiformes
- Superorder Octopodiformes (341)
- Order Coleoidea incertae sedis † (3)
- Subclass Endoceratia † (32)
- Subclass Multiceratia † (290)
- Subclass Nautiloida (136)
- Subclass Orthoceratia † (200)
- Subclass Plectronoceratia † (16)
- Subclass Tarphyceratia † (23)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 753)
- 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