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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)
Order Palaecoleoidea † accepted as Aulacoceratida †
Order Protobelemnoidea † accepted as Aulacoceratida †
Order Sepiida (223)
Suborder Sepiina (134)
Superfamily Sepioidea (131)
Family Anomalosaepiidae Yancey & Garvie, 2011 †
Family Belosaepiidae Dixon, 1850 † (10)
Genus Aegyptosaepia Košťák, Jagt, Speijer, Stassen & Steurbaut, 2013 † (1)
Genus Belosaepia Voltz, 1830 † (7)
Genus Belosepia Bronn, 1830 † accepted as Belosaepia Voltz, 1830 †
Species Belosepia blainvillii (Deshayes, 1835) † accepted as Belosaepia blainvillii (Deshayes, 1835) †
Species Belosepia brevispina J. De C. Sowerby, 1850 † accepted as Belosaepia brevispina J. De C. Sowerby, 1850 †
Species Belosepia oweni J. De C. Sowerby, 1850 † accepted as Belosaepia oweni J. De C. Sowerby, 1850 †
Species Belosepia sepioidea (Blainville, 1825) † accepted as Belosaepia sepioidea (Blainville, 1825) †
Species Belosepia tricarinata (Watelet, 1851) † accepted as Belosaepia tricarinata (Watelet, 1851) †
Genus Ceratisepia Meyer, 1989 †
Genus Pseudosepia Naef, 1923 † (1)
Genus Sepiostera Deshayes, 1833 †
Genus Stenosepia Cossmann, 1913 † (1)
Family Sepiidae Leach, 1817 (121)
Superfamily Vasseurioidea † (3)
Suborder Sepiolida accepted as Sepiolina
Suborder Sepiolina (89)
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