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Mollusca (132 888)
Subphylum Aculifera
Subphylum Conchifera
Subphylum Placophora accepted as Polyplacophora
Superclass Aplacophora
Class Amphineura accepted as Aculifera
Class Bivalvia (25 022)
Class Caudofoveata (143)
Class Cephalopoda (1 838)
Subclass Coleoidea (1 141)
Subclass Endoceratia † (32)
Subclass Multiceratia † (290)
Order Bisonoceratida † (36)
Order Cyrtocerinida †
Order Discosorida † (8)
Order Ellesmeroceratida † (182)
Suborder Cyrtocerinina † (14)
Family Bassleroceratidae Ulrich, Foerste, A. K. Miller & Unklesbay, 1944 † (8)
Family Cyclostomiceratidae Foerste, 1925 † (15)
Family Ellesmeroceratidae Kobayashi, 1934 † (141)
Genus Albertoceras Ulrich & Foerste, 1936 †
Genus Anguloceras Unklesbay & R. S. Young, 1956 †
Genus Annoceras Flower, 1964 † (2)
Genus Barnesoceras Flower, 1964 †
Genus Boreoceras A. K. Miller & Youngquist, 1947 †
Genus Buehleroceras Ulrich, Foerste & A. K. Miller, 1943 † (7)
Genus Burenoceras Ulrich & Foerste, 1931 †
Genus Caseoceras Ulrich, Foerste & A. K. Miller, 1943 †
Genus Clarkeoceras Ruedemann, 1905 † (33)
Genus Clarkoceras Ruedemann, 1905 † accepted as Clarkeoceras Ruedemann, 1905 †
Genus Clelandoceras Ulrich, Foerste, A. K. Miller & Unklesbay, 1944 †
Genus Conocerina Ulrich & Foerste, 1936 † (11)
Genus Copiceras Ulrich, Foerste, A. K. Miller & Unklesbay, 1944 † (1)
Genus Cumberloceras Ulrich, Foerste & A. K. Miller, 1943 † (3)
Genus Cyptendocerina Ulrich, Foerste, A. K. Miller & Unklesbay, 1944 †
Genus Cyrtendoceras Remele, 1886 † (4)
Genus Dakeoceras Ulrich & Foerste, 1931 † (15)
Genus Dyscritoceras Ulrich & Foerste, 1936 † (1)
Genus Ectenoceras Kobayashi, 1933 † (17)
Species Ectenoceras arbucklense Ulrich, Foerste & A. K. Miller, 1943 †
Species Ectenoceras arcuosutum Ulrich, Foerste & A. K. Miller, 1943 †
Species Ectenoceras chepultepecense Ulrich, Foerste & A. K. Miller, 1943 †
Species Ectenoceras compressum Ulrich, Foerste & A. K. Miller, 1943 †
Species Ectenoceras curvatum (Kobayashi, 1931) †
Species Ectenoceras ellipticum Ulrich, Foerste & A. K. Miller, 1943 †
Species Ectenoceras exile Ulrich, Foerste & A. K. Miller, 1943 †
Species Ectenoceras higdonense Ulrich, Foerste & A. K. Miller, 1943 †
Species Ectenoceras laqueatum Ulrich, Foerste & A. K. Miller, 1943 †
Species Ectenoceras longum Ulrich, Foerste & A. K. Miller, 1943 †
Species Ectenoceras millsi Ulrich, Foerste & A. K. Miller, 1943 †
Species Ectenoceras obliquum Ulrich, Foerste & A. K. Miller, 1943 †
Species Ectenoceras pergracile Ulrich, Foerste & A. K. Miller, 1943 †
Species Ectenoceras perobliquum Ulrich, Foerste & A. K. Miller, 1943 †
Species Ectenoceras ruedemanni Kobayashi, 1933 †
Species Ectenoceras subcurvatum Kobayashi, 1933 †
Species Ectenoceras subgracile Ulrich & Foerste, 1936 †
Genus Ectenolites Ulrich & Foerste, 1935 † (4)
Genus Ellesmeroceras Foeste, 1921 † (1)
Genus Eorudolfoceras Kröger & Landing, 2007 † (2)
Genus Eremoceras Hyatt, 1884 † (10)
Genus Keraiaceras Flower, 1964 †
Genus Levisoceras Foerste, 1925 † (15)
Genus Llanoceras Flower, 1964 †
Genus Meikeloceras Flower, 1971 † (1)
Genus Muriceras Flower, 1964 †
Genus Oelandoceras Foerste, 1932 † (3)
Genus Oneotoceras Ulrich, 1926 † (9)
Genus Paradakeoceras Flower, 1964 †
Genus Robsonoceras Ulrich & Foerste, 1936 †
Genus Smithvilloceras Ulrich, Foerste & A. K. Miller, 1943 † (1)
Genus Stemtonoceras Ulrich & Foerste, 1936 †
Genus Vassaroceras Ulrich, Foerste, A. K. Miller & Unklesbay, 1944 †
Genus Walcottoceras Ulrich & Foerste, 1936 † (1)
Genus Woosteroceras Ulrich, Foerste, A. K. Miller & Unklesbay, 1944 †
Family Endocycloceratidae Ulrich, Foerste, A. K. Miller & Unklesbay, 1944 † accepted as Protocycloceratidae Kobayashi, 1935 †
Family Protocycloceratidae Kobayashi, 1935 † (2)
Family Robsonoceratidae Ulrich, Foerste, A. K. Miller & Unklesbay, 1944 † accepted as Ellesmeroceratidae Kobayashi, 1934 †
Family Rudolfoceratidae Ulrich, Foerste, A. K. Miller & Unklesbay, 1944 † (2)
Family Stemtonoceratidae Ulrich, Foerste, A. K. Miller & Unklesbay, 1944 † accepted as Ellesmeroceratidae Kobayashi, 1934 †
Order Oncoceratida † (64)
Subclass Nautiloida (136)
Subclass Orthoceratia † (200)
Subclass Plectronoceratia † (16)
Subclass Tarphyceratia † (23)
Class Conchifera accepted as Bivalvia
Class Cricoconarida † (1)
Class Gastropoda (102 777)
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