Classification of Kennedy and Cobban 1997

Or. †Ammonoidea Zittel 1884 [ammonite]
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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. †Didymoceras Hyatt 1900
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†Didymoceras binodosum Kennedy and Cobban 1993
†Didymoceras platycostatum Kennedy and Cobban 1993
†Didymoceras stevensoni Whitfield 1877
G. †Exiteloceras Hyatt 1894
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†Exiteloceras jenneyi Whitfield 1877
G. †Nostoceras Hyatt 1894
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Subg. †Nostoceras (Nostoceras) Hyatt 1894
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†Nostoceras (Nostoceras) monotuberculatum Kennedy and Cobban 1993
Superfm. †Desmocerataceae Zittel 1895
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Fm. †Pachydiscidae Spath 1922
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G. †Menuites Spath 1922
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†Menuites portlocki Sharp 1855
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†Menuites portlocki complexus Hall and Meek 1855
G. †Pachydiscus Zittel 1884
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Subg. †Pachydiscus (Pachydiscus) Zittel 1884