Classification of Miller and Youngquist 1949
G. †Bitaunioceras Shimizu and Obata 1936
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†Bitaunioceras coahuilense Miller 1944
†Bitaunioceras texanum Miller and Youngquist 1947
G. †Pseudorthoceras Girty 1912
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†Pseudorthoceras knoxense McChesney 1859
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Invalid names: Orthoceras cribrosum Geinitz 1866 [synonym], Orthoceras rushensis Meek and Worthen 1873 [synonym], Pseudorthoceras seminolense Girty 1911 [synonym], Pseudorthoceras splendens Clifton 1942 [synonym]
Or. Nautilida Agassiz 1847
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Fm. †Ephippioceratidae Miller and Youngquist 1949
Fm. †Liroceratidae Miller and Youngquist 1949
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G. †Liroceras Teichert 1940
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†Liroceras globulare Hyatt 1893
†Liroceras salomonensis Gemmellaro 1889
G. †Aulametacoceras Miller and Unklesbay 1942
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†Aulametacoceras mckeei Miller and Unklesbay 1942
G. †Coelogasteroceras Hyatt 1893
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†Coelogasteroceras mexicanum Girty 1909
†Coelogasteroceras thomasi Miller and Cline 1934
G. †Domatoceras Hyatt 1891
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†Domatoceras bradyi Miller and Unklesbay 1942
†Domatoceras northropi Miller and Unklesbay 1942
†Domatoceras walteri Miller and Unklesbay 1942
G. †Endolobus Meek and Worthen 1865
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†Endolobus renfroae Miller and Youngquist 1949
G. †Ephippioceras Hyatt 1884
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†Ephippioceras inexpectans Miller and Youngquist 1947
G. †Foordiceras Hyatt 1893
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†Foordiceras cooperi Miller 1945
†Foordiceras gregarium Miller 1945
†Foordiceras magnicostatum Miller 1945
†Foordiceras mammiferum Miller 1945
†Foordiceras megaporum Miller 1945
†Foordiceras mutatum Miller 1945
†Foordiceras ornatissimum Miller and Youngquist 1949
†Foordiceras praecursor Girty 1908
†Foordiceras shumardianum Girty 1908
G. †Knightoceras Miller and Owen 1934
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†Knightoceras kempae Miller and Youngquist 1949
G. †Metacoceras Hyatt 1883
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†Metacoceras baylorense Miller and Youngquist 1949
†Metacoceras bituberculatum Miller and Youngquist 1949
†Metacoceras cheneyi Miller and Youngquist 1947
†Metacoceras dubium Hyatt 1891
†Metacoceras hayi Hyatt 1891
†Metacoceras inconspicuum Hyatt 1891
†Metacoceras knighti Miller and Thomas 1936
†Metacoceras sulciferum Miller and Thomas 1936
†Metacoceras unklesbayi Miller and Youngquist 1949
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Invalid names: Metacoceras biseriatum Miller and Unklesbay 1942 [replaced]
G. †Solenochilus Meek and Worthen 1870
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†Solenochilus brammeri Miller et al. 1933
†Solenochilus kempae Miller and Youngquist 1949
†Solenochilus syracusense Miller et al. 1933
G. †Stearoceras Hyatt 1893
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†Stearoceras aberrans Miller and Unklesbay 1942
†Stearoceras conchiferum Hyatt 1891
†Stearoceras hesperium Miller and Youngquist 1949
†Stearoceras militarium Hyatt 1893
†Stearoceras phosphoriense Branson 1930
†Stearoceras rotundatum Miller and Unklesbay 1942
†Stearoceras sanandreasense Miller et al. 1933
†Stearoceras simplex Hyatt 1893
†Stearoceras sublaeve Miller et al. 1932
G. †Stenopoceras Hyatt 1893
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†Stenopoceras abundum Miller and Thomas 1936
†Stenopoceras cooperi Miller and Unklesbay 1942
†Stenopoceras dumbli Hyatt 1891
†Stenopoceras inexpectans Miller 1945
†Stenopoceras whitei Miller and Youngquist 1949
G. †Tainoceras Hyatt 1883
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†Tainoceras cavatum Hyatt 1891
†Tainoceras clydense Miller and Kemp 1947
†Tainoceras nebrascense Miller et al. 1933
†Tainoceras schellbachi Miller and Unklesbay 1942
†Tainoceras toulai Gemmellaro 1889
†Tainoceras unklesbayi Miller and Youngquist 1949
†Tainoceras wyomingense Miller and Thomas 1936
G. †Temnocheilus M'Coy 1844
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†Temnocheilus inaequilaterale Miller and Youngquist 1949