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Mollusca (133 046)
Subphylum Aculifera
Subphylum Conchifera
Subphylum Placophora accepted as Polyplacophora
Superclass Aplacophora
Class Amphineura accepted as Aculifera
Class Bivalvia (25 043)
Class Caudofoveata (143)
Class Cephalopoda (1 863)
Subclass Coleoidea (1 148)
Superorder Ammonoida † (78)
Superorder Bactritoidea †
Superorder Decabrachia represented as Decapodiformes
Superorder Decapodiformes (726)
Order [unassigned] Decapodiformes (2)
Order Aulacoceratida † (18)
Order Bathyteuthida (9)
Order Belemnitida † (142)
Suborder Belemnitina † (83)
Suborder Belemnopseina † (59)
Section Pseudoalveolata † (32)
Family Belemnitellidae Pavlov, 1914 † (15)
Genus Belemnella Nowak, 1913 † (1)
Genus Belemnitella d'Orbigny, 1840 † (11)
Species Belemnitella americana (Morton, 1830) †
Species Belemnitella arkhangelskii Naidin, 1952 †
Species Belemnitella badlandensis Landman, Remin, Garb & Chamberlain Jr., 2013 †
Species Belemnitella bulbosa Meek & Hayden, 1857 †
Species Belemnitella carlsbergensis Christensen, 1998 †
Species Belemnitella junior Nowak, 1913 †
Species Belemnitella kazimiroviensis Skołozdrówna, 1932 † accepted as Neobelemnella kazimiroviensis (Skołozdrówna, 1932) †
Species Belemnitella lanceolata (Schlotheim, 1813) † accepted as Belemnella lanceolata (Schlotheim, 1813) †
Species Belemnitella langei Jeletzky, 1948 †
Species Belemnitella lwowensis Naidin, 1952 †
Species Belemnitella mucronata (Schlotheim, 1813) †
Species Belemnitella posterior Kongiel, 1962 †
Species Belemnitella pulchra Schulz, 1982 †
Species Belemnitella subfusiformis Whitfield, 1892 †
Genus Fusiteuthis Kongiel, 1962 † (1)
Genus Neobelemnella Naidin, 1975 † (2)
Family Belemnopseidae Naef, 1922 † (15)
Family Dimitobelidae Whitehouse, 1924 † (2)
Family Cylindroteuthidae Stolley, 1919 †
Family Dicoelitidae Sachs & Nalnjaeva, 1967 † (1)
Family Duvaliidae Pavlov, 1914 † (25)
Family Holcobelidae Gustomesov, 1977 † (1)
Family Oxyteuthidae Stolley, 1919 †
Suborder Belemnotheutina †
Family Phragmoteuthidae Naef, 1921 †
Family Sinobelemnitidae Bian & Zhu, 1984 †
Genus Chrysaor Montfort, 1808 †
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)
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 (154)
Subclass Orthoceratia † (200)
Subclass Plectronoceratia † (16)
Subclass Tarphyceratia † (23)
Class Conchifera accepted as Bivalvia
Class Cricoconarida † (1)
Class Gastropoda (102 884)
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 (1 381)
Class Polyplaxiphora accepted as Polyplacophora
Class Rostroconchia † (64)
Class Scaphopoda (753)
Class Solenoconchia accepted as Scaphopoda
Class Solenogastres (313)
Subclass Chaetodermomorpha accepted as Caudofoveata