Between brackets is the number of accepted species

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- Mollusca (132 791)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 009)
- 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)
- Suborder Oegopsina represented as Oegopsida
- Superfamily Architeuthoidea Pfeffer, 1900 (5)
- Superfamily Chiroteuthoidea Gray, 1849 (41)
- Superfamily Cranchioidea Prosch, 1847 (64)
- Family Bathothaumatidae Grimpe, 1922 accepted as Cranchiidae Prosch, 1847
- Family Cranchiidae Prosch, 1847 (36)
- Family Desmoteuthidae A. E. Verrill, 1881 accepted as Cranchiidae Prosch, 1847
- Family Loligopsidae A. d'Orbigny, 1842 accepted as Cranchiidae Prosch, 1847
- Family Ommastrephidae Steenstrup, 1857 (25)
- Subfamily Illicinae Posselt, 1891 (4)
- Subfamily Ommastrephinae Steenstrup, 1857 (9)
- Subfamily Ommatostrephinae Steenstrup, 1857 accepted as Ommastrephinae Steenstrup, 1857
- Subfamily Ornithoteuthinae Nigmatullin, 1979 (2)
- Subfamily Todarodinae Adam, 1960 (9)
- Genus Martialia Rochebrune & Mabille, 1889 (1)
- Species Martialia hyadesi Rochebrune & Mabille, 1889
- Genus Nototodarus Pfeffer, 1912 (3)
- Genus Todarodes Steenstrup, 1880 (5)
- Subfamily Todaropsinae Nigmatullin, 2000 (1)
- Genus Cycria Leach, 1849 accepted as Ommastrephes A. d'Orbigny, 1835
- Genus Lolimnites Risso, 1854 accepted as Ommastrephes A. d'Orbigny, 1835
- Genus Ommatostrephes Lovén, 1845 accepted as Ommastrephes A. d'Orbigny, 1835
- Genus Sagittatus Risso, 1854 accepted as Todarodes Steenstrup, 1880
- Genus Symplectoteuthis Pfeffer, 1900 accepted as Sthenoteuthis A. E. Verrill, 1880
- Family Thysanoteuthidae W. Keferstein, 1866 (3)
- Superfamily Cycloteuthoidea Naef, 1923 (11)
- Superfamily Enoploteuthoidea Pfeffer, 1900 (57)
- Superfamily Octopoteuthoidea S. S. Berry, 1912 (9)
- Superfamily Oegopsida incertae sedis (66)
- Superfamily Ommastrephoidea Steenstrup, 1857 accepted as Cranchioidea Prosch, 1847
- Superfamily Onychoteuthoidea Gray, 1847 accepted as Oegopsida incertae sedis
- Superfamily Pholidoteuthoidea Adam, 1950 (2)
- Superfamily Thysanoteuthoidea W. Keferstein, 1866 accepted as Cranchioidea Prosch, 1847
- Order Palaecoleoidea † accepted as Aulacoceratida †
- Order Protobelemnoidea † accepted as Aulacoceratida †
- Order Sepiida (223)
- Order Spirulida (13)
- 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 (102 697)
- 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