Classification of Kennedy et al. 2000
Fm. †Diplomoceratidae Spath 1926
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Subfm. †Polyptychoceratinae Matsumoto 1938
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G. †Solenoceras Conrad 1860
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†Solenoceras annulifer Morton 1824
†Solenoceras bearpawense Kennedy et al. 2000
†Solenoceras elegans Kennedy et al. 2000
†Solenoceras larimerense Kennedy et al. 2000
Subor. †Ancyloceratina Wiedmann 1966
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Superfm. †Turrilitaceae Gill 1871
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Fm. †Nostoceratidae Hyatt 1894
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G. †Anaklinoceras Stephenson 1941
G. †Axonoceras Stephenson 1941
G. †Bostrychoceras Hyatt 1900
G. †Cirroceras Conrad 1866
G. †Didymoceras Hyatt 1900
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†Didymoceras angulatum Meek and Hayden 1860
†Didymoceras binodosum Kennedy and Cobban 1993
†Didymoceras cheyenense Meek and Hayden 1856
†Didymoceras cochleatus Meek and Hayden 1858
†Didymoceras navarroensis Shumard 1861
†Didymoceras nebrascense Meek and Hayden 1856
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Invalid names: Emperoceras beecheri Hyatt 1894 [synonym], Emperoceras simplicostatum Whitfield 1902 [synonym]
†Didymoceras newtoni Whitfield 1877
†Didymoceras nicolletii Hall and Meek 1855
†Didymoceras platycostatum Kennedy and Cobban 1993
†Didymoceras stevensoni Whitfield 1877
†Didymoceras tenuicostatus Meek and Hayden 1858
†Didymoceras tortus Meek and Hayden 1858
†Didymoceras tricostatus Whitfield 1897
†Didymoceras umbilicatus Meek and Hayden 1858
†Didymoceras uncus Meek and Hayden 1858
†Didymoceras vespertinus Conrad 1874
Invalid names: Didymoceratoides Kennedy and Cobban 1993 [synonym], Emperoceras Hyatt 1894 [synonym]
G. †Eubostrychoceras Matsumoto 1967
G. †Nostoceras Hyatt 1894
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†Nostoceras alternatus Tuomey 1854
†Nostoceras approximans Conrad 1855
†Nostoceras arkanasanum Kennedy and Cobban 1993
†Nostoceras colubriformis Stephenson 1941
†Nostoceras danei Kennedy and Cobban 1993
†Nostoceras draconis Stephenson 1941
†Nostoceras helicinus Shumard 1861
†Nostoceras hyatti Stephenson 1941
†Nostoceras mendryki Cobban 1974
†Nostoceras monotuberculatum Kennedy and Cobban 1993
†Nostoceras pauper Whitfield 1892
†Nostoceras pleurocostatum Kennedy and Cobban 1993
†Nostoceras pulcher Kennedy and Cobban 1993
†Nostoceras saundersorum Stephenson 1941
†Nostoceras splendidus Shumard 1861
†Nostoceras stantoni Hyatt 1894
Invalid names: Jouaniceratidae Wright 1952 [synonym]