Classification of Wood 1927
†Caenopus simplicidens Cope 1891
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G. †Eotrigonias Wood 1927
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†Eotrigonias petersoni Wood 1927
†Eotrigonias rhinocerinus Wood 1927
†Hyracodon quadriplicatus Cope 1873
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Fm. †Hyracodontidae Cope 1879
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Fm. Rhinocerotidae Gray 1821 [rhinoceros]
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G. †Subhyracodon Wood 1927
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†Subhyracodon copei Osborn 1898
†Subhyracodon gidleyi Wood 1927
†Subhyracodon metalophum Wood 1927
†Subhyracodon occidentalis Leidy 1850
†Subhyracodon tridactylus Osborn 1893
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Invalid names: Diceratherium proavitum Hatcher 1894 [synonym]
†Subhyracodon trigonodus Osborn and Wortman 1894
Invalid names: Anchisodon Cope 1879 [synonym], Leptaceratherium Osborn 1898 [synonym]
G. †Diceratherium Marsh 1875
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†Diceratherium avum Wood 1927
†Diceratherium persistens Osborn 1904
Invalid names: Metacaenopus Cook 1908 [synonym]
G. †Menoceras Troxell 1921
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†Menoceras cooki Peterson 1906
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Invalid names: Aceratherium stigeri Loomis 1908 [synonym], Diceratherium aberrans Loomis 1908 [synonym], Diceratherium arikarense Barbour 1906 [synonym], Diceratherium loomisi Cook 1912 [synonym], Diceratherium schiffi Loomis 1908 [synonym]
G. †Trigonias Lucas 1900
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†Trigonias gregoryi Wood 1927
†Trigonias paucidens Wood 1927
†Trigonias wellsi Wood 1927
G. †Caenopus Cope 1880
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†Diceratherium niobrarense Peterson 1906
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Invalid names: Metacaenopus egregius Cook 1908 [synonym]
†Hyracodon arcidens Cope 1873
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Invalid names: Hyracodon priscidens Lambe 1905 [synonym], Hyracodon selenidens Troxell 1921 [synonym]
G. †Prothyracodon Scott and Osborn 1887
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†Prothyracodon obliquidens Scott and Osborn 1887
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Invalid names: Prothyracodon intermedium Scott and Osborn 1887 [synonym]
†Trigonias osborni Lucas 1900
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Invalid names: Trigonias tetradactylum Osborn 1923 [synonym]