Classification of Kennedy et al. 2000

Subor. †Ancyloceratina Wiedmann 1966
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Superfm. †Turrilitaceae Gill 1871
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Fm. †Diplomoceratidae Spath 1926
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Subfm. †Diplomoceratinae Spath 1926
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G. †Lewyites
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†Lewyites oronensis Lewy 1969
G. †Solenoceras Conrad 1860
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†Solenoceras reesidei Stephenson 1941
†Solenoceras texanum Shumard 1861
Fm. †Nostoceratidae Hyatt 1894
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G. †Anaklinoceras Stephenson 1941
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†Anaklinoceras minutum Kennedy et al. 2000
G. †Cirroceras Conrad 1866
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†Cirroceras conradi Morton 1841
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Invalid names: Helicoceras navarroensis Shumard 1861 [synonym]
G. †Didymoceras Hyatt 1900
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†Didymoceras aurarium Kennedy et al. 2000
†Didymoceras draconis Stephenson 1941
G. †Nostoceras Hyatt 1894
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†Nostoceras approximans Conrad 1855
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Invalid names: Nostoceras stantoni Hyatt 1894 [synonym]
†Nostoceras larimerense Kennedy et al. 2000
†Nostoceras obtusum Howarth 1965
†Nostoceras splendidum Shumard 1861
Invalid names: Bostrychoceratinae Spath 1953 [invalid subgroup], Emperoceratinae Spath 1953 [invalid subgroup], Hyphantoceratinae Spath 1953 [invalid subgroup], Jouaniceratidae Wright 1952 [synonym]