Classification of Troxell 1921

G. †Trigonias Lucas 1900
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Trigonias osborni Lucas 1900
G. †Caenopus Cope 1880
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Subg. †Caenopus (Leptaceratherium) Troxell 1921
Caenopus copei Osborn 1898
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Invalid names: Rhinoceros occidentalis Leidy 1850 [synonym]
Caenopus mitis Cope 1875
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Invalid names: Caenopus pumilus Cope 1886 [synonym]
Caenopus platycephalus Osborn and Wortman 1894
Caenopus simplicidens Cope 1891
Caenopus tridactylus Osborn 1893
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Caenopus tridactylus avus Troxell 1921
Invalid names: Diceratherium proavitum Hatcher 1894 [synonym]
Caenopus trigonodus Osborn and Wortman 1894
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Caenopus trigonodus allus Troxell 1921
Invalid names: Leptaceratherium Osborn 1898 [synonym]