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 (132 888)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 022)
- Class Caudofoveata (143)
- Class Cephalopoda (1 838)
- Subclass Coleoidea (1 141)
- Subclass Endoceratia † (32)
- Subclass Multiceratia † (290)
- Subclass Nautiloida (136)
- Order Actinocerida † accepted as Actinoceratida †
- Order Ellesmerocerida † accepted as Ellesmeroceratida †
- Order Intejocerida † (1)
- Order Mixosiphonata † (1)
- Order Nautilida (133)
- Superfamily Aipoceratoidea Hyatt, 1883 † (3)
- Superfamily Aturioidea Hyatt, 1894 † (9)
- Superfamily Clydonautiloidea Hyatt, 1900 † (3)
- Superfamily Nautiloidea Blainville, 1825 (61)
- Superfamily Tainoceratoidea Hyatt, 1883 † (7)
- Superfamily Trigonoceratoidea Kummel, 1964 † (49)
- Family Nautilida incertae sedis † (1)
- Genus Conchorhynchus Blainville, 1827 † (1)
- Species Conchorhynchus tabellulis A. Martinez, 2023 †
- Genus Cyrtoceras Conrad, 1838 †
- Order Nautiloida incertae sedis † (1)
- Order Oncocerida † accepted as Oncoceratida †
- Order Orthocerida † accepted as Orthoceratida †
- Subclass Orthoceratia † (200)
- Subclass Plectronoceratia † (16)
- Subclass Tarphyceratia † (23)
- 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