Classification of Radinsky 1966
Superfm. Rhinocerotoidea Gray 1821
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Fm. †Amynodontidae Scott and Osborn 1883
Fm. †Helaletidae Osborn 1892
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Subfm. †Hyrachyinae Osborn 1892
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G. †Hyrachyus Leidy 1871
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Invalid names: Colonoceras Marsh 1873 [synonym], Ephyrachyus Wood 1934 [synonym], Metahyrachyus Troxell 1922 [synonym]
Invalid names: Helaletinae Osborn 1892 [empty]
Fm. †Hyracodontidae Cope 1879
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G. †Allacerops Wood 1932
G. †Ardynia Matthew and Granger 1923
G. †Eggysodon Roman 1910
G. †Eotrigonias Wood 1927
G. †Hyracodon Leidy 1856
G. †Indricotherium Borissiak 1916
G. †Juxia Chow and Chiu 1964
G. †Pappaceras Wood 1963
G. †Paraceratherium Forster Cooper 1911
G. †Praeaceratherium Abel 1910
G. †Prohyracodon Koch 1897
G. †Prothyracodon Scott and Osborn 1887
G. †Triplopus Cope 1880
G. †Urtinotherium Chow and Chiu 1963
Fm. Rhinocerotidae Gray 1821 [rhinoceros]
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G. †Epiaceratherium Borissiak 1915
G. †Trigonias Lucas 1900