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Mollusca (132 754)
Subphylum Aculifera
Subphylum Conchifera
Subphylum Placophora accepted as Polyplacophora
Superclass Aplacophora
Class Amphineura accepted as Aculifera
Class Bivalvia (24 992)
Class Caudofoveata (143)
Class Cephalopoda (1 832)
Subclass Coleoidea (1 135)
Superorder Ammonoida † (76)
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)
Superfamily Cycloteuthoidea Naef, 1923 (11)
Superfamily Enoploteuthoidea Pfeffer, 1900 (57)
Family Ancistrocheiridae Pfeffer, 1912 (1)
Family Enoploteuthidae Pfeffer, 1900 (43)
Subfamily Ancistrocheirinae accepted as Ancistrocheiridae Pfeffer, 1912
Genus Abralia J. E. Gray, 1849 (20)
Genus Abraliopsis Joubin, 1896 (11)
Subgenus Abraliopsis (Abraliopsis) Joubin, 1896 represented as Abraliopsis Joubin, 1896
Subgenus Abraliopsis (Boreabraliopsis) Tsuchiya & Okutani, 1988 represented as Abraliopsis Joubin, 1896
Subgenus Abraliopsis (Micrabralia) Pfeffer, 1900 represented as Abraliopsis Joubin, 1896
Species Abraliopsis (Micrabralia) atlantica Nesis, 1982 accepted as Abraliopsis (Pfefferiteuthis) atlantica Nesis, 1982
Species Abraliopsis (Micrabralia) chuni Nesis, 1982 accepted as Abraliopsis (Pfefferiteuthis) chuni Nesis, 1982
Species Abraliopsis (Micrabralia) gilchristi (G. C. Robson, 1924) represented as Abraliopsis gilchristi (G. C. Robson, 1924)
Species Abraliopsis (Micrabralia) lineata (E. S. Goodrich, 1896) represented as Abraliopsis lineata (E. S. Goodrich, 1896)
Subgenus Abraliopsis (Pfefferiteuthis) Tsuchiya & Okutani, 1988 represented as Abraliopsis Joubin, 1896
Subgenus Abraliopsis (Watasenia) Ishikawa, 1914 accepted as Watasenia Ishikawa, 1914
Species Abraliopsis affinis (Pfeffer, 1912)
Species Abraliopsis atlantica Nesis, 1982
Species Abraliopsis chuni Nesis, 1982
Species Abraliopsis falco R. E. Young, 1972
Species Abraliopsis felis McGowan & Okutani, 1968
Species Abraliopsis gilchristi (G. C. Robson, 1924)
Species Abraliopsis hoylei (Pfeffer, 1884)
Species Abraliopsis joubini Watase, 1906
Species Abraliopsis lineata (E. S. Goodrich, 1896)
Species Abraliopsis morisii (Vérany, 1839)
Species Abraliopsis pacificus Tsuchiya & Okutani, 1990
Species Abraliopsis pfefferi Joubin, 1896 accepted as Abraliopsis morisii (Vérany, 1839)
Species Abraliopsis scintillans S. S. Berry, 1911 accepted as Watasenia scintillans (S. S. Berry, 1911)
Species Abraliopsis tui Riddell, 1985
Genus Asteroteuthis Pfeffer, 1908 accepted as Abralia (Asteroteuthis) Pfeffer, 1908
Genus Compsoteuthis Pfeffer, 1900 accepted as Abralia (Astrabralia) Nesis, 1987
Genus Enigmoteuthis Adam, 1973 accepted as Abralia (Enigmoteuthis) Adam, 1973
Genus Enoploion Pfeffer, 1912 accepted as Abralia J. E. Gray, 1849
Genus Enoploteuthis A. d'Orbigny, 1842 (11)
Genus Micrabralia Pfeffer, 1900 accepted as Abraliopsis (Micrabralia) Pfeffer, 1900
Genus Watasenia Ishikawa, 1914 (1)
Family Lampadioteuthidae S. S. Berry, 1916 (1)
Family Lycoteuthidae Pfeffer, 1908 (5)
Family Pyroteuthidae Pfeffer, 1912 (7)
Family Thaumatolampadidae Chun, 1903 accepted as Lycoteuthidae Pfeffer, 1908
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 (102 679)
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