Classification of Ulrich et al. 1944
Cl. Cephalopoda Cuvier 1797
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Fm. †Bassleroceratidae Ulrich et al. 1944
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G. †Avaoceras Ulrich et al. 1944
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†Avaoceras elongatum Ulrich et al. 1944
†Avaoceras longidomum Ulrich et al. 1944
†Avaoceras magnisiphonatum Ulrich et al. 1944
†Avaoceras wellsense Ulrich et al. 1944
G. †Bassleroceras Ulrich and Foerste 1936
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†Bassleroceras acinacellum Whitfield 1886
†Bassleroceras beekmanense Whitfield 1889
†Bassleroceras bridgei Ulrich et al. 1944
†Bassleroceras dalevillense Ulrich et al. 1944
†Bassleroceras kayi Ulrich et al. 1944
†Bassleroceras kirbyi Whitfield 1889
†Bassleroceras lasallense Ulrich et al. 1944
†Bassleroceras microscopium Dwight 1884
†Bassleroceras perseus Billings 1865
†Bassleroceras tenuiculum Ulrich et al. 1944
†Bassleroceras vassarina Dwight 1884
G. †Lawrenceoceras Ulrich et al. 1944
G. †Leptocyrtoceras Ulrich et al. 1944
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†Leptocyrtoceras curvatum Ulrich et al. 1944
†Leptocyrtoceras powellense Ulrich et al. 1944
†Leptocyrtoceras virginianum Ulrich et al. 1944
G. †Monogonoceras Ulrich et al. 1944
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†Monogonoceras alabamense Ulrich et al. 1944
†Monogonoceras magnisiphonatum Ulrich et al. 1944
†Monogonoceras subrectum Ulrich et al. 1944
G. †Onychoceras Ulrich and Foerste 1936
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†Onychoceras australe Ulrich et al. 1944
†Onychoceras subrotundum Ulrich et al. 1944
†Onychoceras surgens Barrande 1870
G. †Stylocyrtoceras Ulrich et al. 1944
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†Stylocyrtoceras avaense Ulrich et al. 1944
†Stylocyrtoceras tantillum Stauffer 1937
Fm. †Endoceratidae Hyatt 1884
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G. †Endoceras Hall 1847
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†Endoceras annuliferum Flower 1941
†Endoceras aristides Billings 1865
†Endoceras baculoides Blake 1882
†Endoceras baylorense Ulrich et al. 1944
†Endoceras calvini Ulrich et al. 1944
†Endoceras champlainense Ruedemann 1906
†Endoceras deparcum Billings 1859
†Endoceras durinum Blake 1882
†Endoceras eburneolum Stauffer 1937
†Endoceras glaucus Billings 1865
†Endoceras hageri Hall 1861
†Endoceras indigator Billings 1865
†Endoceras knighti Ulrich et al. 1944
†Endoceras lamottense Ulrich et al. 1944
†Endoceras lawrencense Ulrich et al. 1944
†Endoceras logani Ulrich et al. 1944
†Endoceras philipsburgense Ulrich et al. 1944
†Endoceras primigenium Vanuxem 1842
†Endoceras pusillum Ruedemann 1906
†Endoceras richardsoni Ulrich et al. 1944
†Endoceras sansabaense Ulrich et al. 1944
†Endoceras tityrus Billings 1865
†Endoceras trundlesense Ulrich et al. 1944
†Endoceras warthini Ulrich et al. 1944
†Endoceras yellvillense Ulrich et al. 1944
Fm. †Spyroceratidae Shimizu and Obata 1935
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G. †Catoraphiceras Ulrich and Foerste 1936
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†Catoraphiceras colon White 1874
†Catoraphiceras cushingi Ulrich et al. 1944
†Catoraphiceras osagense Ulrich et al. 1944
†Catoraphiceras resseri Ulrich et al. 1944
†Catoraphiceras sordidum Billings 1859
G. †Protocycloceras Hyatt 1900
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†Protocycloceras abnorme Ulrich et al. 1944
†Protocycloceras arkansasense Ulrich et al. 1944
†Protocycloceras doniphonense Ulrich et al. 1944
†Protocycloceras furtivum Billings 1865
†Protocycloceras levisense Ulrich et al. 1944
†Protocycloceras manitouense Ulrich et al. 1944
†Protocycloceras odenvillense Ulrich et al. 1944
†Protocycloceras ordinatum Billings 1865
†Protocycloceras philipsburgense Ulrich et al. 1944
†Protocycloceras smithvillense Ulrich et al. 1944
†Protocycloceras xerxes Billings 1865
Invalid names: Endocycloceratidae Ulrich et al. 1944 [empty], Orthocerotidae Miller and Teichert 1936 [empty], Robsonoceratidae Ulrich et al. 1944 [empty], Stemtonoceratidae Ulrich et al. 1944 [empty]
G. †Diaphoroceras Ulrich et al. 1944
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†Diaphoroceras avaense Ulrich et al. 1944
†Diaphoroceras belli Ulrich et al. 1944
†Diaphoroceras buffaloense Ulrich et al. 1944
G. †Robsonoceras Ulrich and Foerste 1933
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†Robsonoceras manitouense Ulrich et al. 1944
†Robsonoceras robsonense Walcott 1924
G. †Clitendoceras Ulrich and Foerste 1936
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†Clitendoceras montrealense Ruedemann 1906
Fm. †Rudolfoceratidae Ulrich et al. 1944
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G. †Ectocycloceras Ulrich and Foerste 1936
G. †Rudolfoceras Ulrich et al. 1944
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†Rudolfoceras cornuoryx Whitfield 1886
†Rudolfoceras kindlei Ulrich et al. 1944
†Rudolfoceras subarcuatum Ulrich et al. 1944