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Mollusca (133 306)
Subphylum Aculifera
Subphylum Conchifera
Subphylum Placophora accepted as Polyplacophora
Superclass Aplacophora
Class Amphineura accepted as Aculifera
Class Bivalvia (25 080)
Class Caudofoveata (143)
Class Cephalopoda (1 921)
Subclass Coleoidea (1 150)
Subclass Endoceratia † (34)
Subclass Multiceratia † (307)
Subclass Nautiloida (171)
Subclass Orthoceratia † (216)
Order Actinoceratida † (40)
Order Astroviida † (39)
Order Dissidoceratida † (9)
Order Dissidocerida † accepted as Dissidoceratida †
Order Orthoceratida † (55)
Order Pseudorthoceratida † (49)
Superfamily Pseudorthoceratoidea Flower & Caster, 1935 † (49)
Family Carbactinoceratidae Schindewolf, 1943 † (5)
Family Greenlandoceratidae Shimizu & Obata, 1935 † (6)
Family Pseudactinoceratidae Schindewolf, 1943 † (3)
Family Pseudorthoceratidae Flower & Caster, 1935 † (33)
Subfamily Cayutoceratinae Flower, 1939 † (5)
Subfamily Dolorthoceratinae Flower, 1939 † accepted as Spyroceratinae Shimizu & Obata, 1935 †
Subfamily Pseudorthoceratinae Flower & Caster, 1935 † (12)
Genus Bergoceras Flower, 1939 † (1)
Genus Mooreoceras Miller, Dunbar & Condra, 1933 † (5)
Species Mooreoceras bradfordoides Flower, 1939 †
Species Mooreoceras imoense Kröger & Mapes, 2004 † accepted as Campyloceras imoense (Kröger & Mapes, 2004) †
Species Mooreoceras normale Miller, Dunbar & Condra, 1933 †
Species Mooreoceras ruedemanni Flower, 1939 †
Species Mooreoceras sibumasuense Niko, Sone & Leman, 2005 †
Species Mooreoceras striatulum Kröger & Mapes, 2004 † accepted as Campyloceras striatulum (Kröger & Mapes, 2004) †
Species Mooreoceras zalazarense Sabattini & Riccardi, 1984 †
Genus Paraloxoceras Flower, 1939 † (1)
Genus Pseudorthoceras Girty, 1911 † (3)
Genus Sueroceras Riccardi & Sabattini, 1975 † (2)
Subfamily Spyroceratinae Shimizu & Obata, 1935 † (15)
Genus Cryptorthoceras Flower, 1939 †
Genus Diagoceras Flower, 1936 †
Genus Fusioceras Flower, 1939 † (1)
Genus Petryoceras Flower, 1939 †
Family Pseudorthoceratoidea incertae sedis † (1)
Family Pseudowutinoceratidae Chen, 1984 † accepted as Greenlandoceratidae Shimizu & Obata, 1935 †
Family Sactoceratidae Troedsson, 1926 †
Family Stereoplasmoceratidae Kobayashi, 1934 † (1)
Family Striatoceratidae Flower, 1939 † accepted as Greenlandoceratidae Shimizu & Obata, 1935 †
Order Rioceratida † (23)
Genus Haruspex Shimansky, 1968 † accepted as Uralharuspex Ceccolini & Cianferoni, 2023
Genus Uralharuspex Ceccolini & Cianferoni, 2023 (1)
Subclass Plectronoceratia † (16)
Subclass Tarphyceratia † (27)
Class Conchifera accepted as Bivalvia
Class Cricoconarida † (1)
Class Gastropoda (103 048)
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 (754)
Class Solenoconchia accepted as Scaphopoda
Class Solenogastres (313)
Subclass Chaetodermomorpha accepted as Caudofoveata