Between brackets is the number of accepted species

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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)
- Superorder Bactritoidea †
- Superorder Decabrachia represented as Decapodiformes
- Superorder Decapodiformes (715)
- Order [unassigned] Decapodiformes (2)
- Order Aulacoceratida † (18)
- Order Bathyteuthida (9)
- Order Belemnitida † (131)
- Order Diplobelida † (7)
- Order Idiosepida (8)
- Order Myopsida (48)
- Order Oegopsida (255)
- Order Palaecoleoidea † accepted as Aulacoceratida †
- Order Protobelemnoidea † accepted as Aulacoceratida †
- Order Sepiida (223)
- Order Spirulida (13)
- Suborder Spirulida incertae sedis † (1)
- Superfamily Spiruloidea Rafinesque, 1815 (1)
- Family Belemnoseidae Wiltshire, 1869 †
- Family Belopteridae Fischer, 1887 † (5)
- Genus Beloptera Blainville, 1825 † (2)
- Subgenus Beloptera (Belopterina) Munier-Chalmas, 1872 † accepted as Belopterina Munier-Chalmas, 1872 †
- Species Beloptera belemnoidea Blainville, 1825 †
- Species Beloptera compressa Blainville, 1827 † accepted as Stenosepia compressa (Blainville, 1827) †
- Species Beloptera curta Cossmann, 1896 †
- Species Beloptera deshayesi É. Vincent, 1901 † accepted as Belopterina deshayesi (É. Vincent, 1901) †
- Species Beloptera edwardsi Deshayes, 1865 † accepted as Belopterina edwardsi (Deshayes, 1865) †
- Species Beloptera levesquei A. d'Orbigny, 1842 † accepted as Belopterina levesquei (A. d'Orbigny, 1842) †
- Species Beloptera sepioidea Blainville, 1825 † accepted as Belosaepia sepioidea (Blainville, 1825) †
- Genus Belopterina Munier-Chalmas, 1872 † (3)
- Family Groenlandibelidae Jeletzky, 1966 † (4)
- Family Spirulirostridae Naef, 1921 † (2)
- Order Teuthida
- Family Bayanoteuthidae Naef, 1922 †
- Family Mississaepiidae Doguzhaeva, P. G. Weaver & Ciampaglio, 2014 † (1)
- 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