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Mollusca (132 848)
Subphylum Aculifera
Subphylum Conchifera
Subphylum Placophora accepted as Polyplacophora
Superclass Aplacophora
Class Amphineura accepted as Aculifera
Class Bivalvia (25 011)
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)
Family Architeuthidae Pfeffer, 1900 (1)
Genus Architeuthis Steenstrup, 1857 (1)
Species Architeuthis clarkei G. C. Robson, 1933 accepted as Architeuthis dux Steenstrup, 1857
Species Architeuthis dux Steenstrup, 1857
Species Architeuthis hartingii (A. E. Verrill, 1875) accepted as Architeuthis dux Steenstrup, 1857
Species Architeuthis japonica Pfeffer, 1912 accepted as Architeuthis dux Steenstrup, 1857
Species Architeuthis kirkii C. W. Robson, 1887 accepted as Architeuthis dux Steenstrup, 1857
Species Architeuthis longimanus T. W. Kirk, 1888 accepted as Architeuthis dux Steenstrup, 1857
Species Architeuthis martensii (Hilgendorf, 1880) accepted as Architeuthis dux Steenstrup, 1857
Species Architeuthis megaptera A. E. Verrill, 1878 accepted as Sthenoteuthis pteropus (Steenstrup, 1855)
Species Architeuthis monachus Steenstrup, 1860 accepted as Architeuthis dux Steenstrup, 1857
Species Architeuthis nawaji Cadenat, 1935 accepted as Architeuthis dux Steenstrup, 1857
Species Architeuthis physeteris (Joubin, 1900) accepted as Architeuthis dux Steenstrup, 1857
Species Architeuthis princeps A. E. Verrill, 1875 accepted as Architeuthis dux Steenstrup, 1857
Species Architeuthis sanctipauli (Vélain, 1877) accepted as Architeuthis dux Steenstrup, 1857
Species Architeuthis stockii (T. W. Kirk, 1882) accepted as Architeuthis dux Steenstrup, 1857
Species Architeuthis verrilli T. W. Kirk, 1882 accepted as Architeuthis dux Steenstrup, 1857
Genus Dinoteuthis More, 1875 accepted as Architeuthis Steenstrup, 1857
Genus Dubioteuthis Joubin, 1900 accepted as Architeuthis Steenstrup, 1857
Genus Megaloteuthis Kent, 1874 accepted as Architeuthis Steenstrup, 1857
Genus Megateuthus Hilgendorf, 1880 accepted as Architeuthis Steenstrup, 1857
Genus Mouchezis Vélain, 1877 accepted as Architeuthis Steenstrup, 1857
Genus Plectoteuthis R. Owen, 1881 accepted as Architeuthis Steenstrup, 1857
Genus Steenstrupia T. W. Kirk, 1882 accepted as Architeuthis Steenstrup, 1857
Family Neoteuthidae Naef, 1921 (4)
Superfamily Chiroteuthoidea Gray, 1849 (41)
Superfamily Cranchioidea Prosch, 1847 (64)
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 (102 752)
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