Classification of Kennedy and Cobban 1993

Fm. †Baculitidae Gill 1871
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G. †Baculites Lamarck 1799
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†Baculites ovatus Say 1820
†Baculites undatus Stephenson 1941
Fm. †Pachydiscidae Spath 1922
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G. †Pachydiscus Zittel 1884
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Subg. †Pachydiscus (Pachydiscus) Zittel 1884
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Fm. †Gaudryceratidae Spath 1927
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G. †Gaudryceras de Grossouvre 1894
Fm. †Nostoceratidae Hyatt 1894
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G. †Didymoceras Hyatt 1900
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†Didymoceras navarroense Shumard 1861
G. †Nostoceras Hyatt 1894
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Subg. †Nostoceras (Nostoceras) Hyatt 1894
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Invalid names: Nostoceras stantoni Hyatt 1894 [synonym]
†Nostoceras (Nostoceras) hyatti Stephenson 1941
Fm. †Diplomoceratidae Spath 1926
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Subfm. †Diplomoceratinae Spath 1926
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G. †Lewyites
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†Lewyites circularis Lewy 1969
†Lewyites oronensis Lewy 1969
G. †Solenoceras Conrad 1860
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†Solenoceras texanum Shumard 1861
Fm. †Scaphitidae Gill 1871
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Subfm. †Scaphitinae Gill 1871
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G. †Hoploscaphites Nowak 1911
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†Hoploscaphites pumilis Stephenson 1941
G. †Jeletzkytes Riccardi 1983
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†Jeletzkytes nodosus Owen 1852
Subfm. †Kossmaticeratinae Spath 1922
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G. †Pseudokossmaticeras Spath 1922
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