Classification of Peterson 1920
†Rhinoceros hesperius Leidy 1865
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†Rhinoceros oregonensis Marsh 1873
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Fm. Rhinocerotidae Gray 1821 [rhinoceros]
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Invalid names: Rhinoceros pacificus Leidy 1872 [nomen dubium]
G. †Diceratherium Marsh 1875
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†Diceratherium gregorii Peterson 1920
†Diceratherium truquianum Cope 1879
Invalid names: Metacaenopus Cook 1908 [synonym]
G. †Caenopus Cope 1880
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†Caenopus copei Osborn 1898
†Caenopus dakotensis Peterson 1920
†Diceratherium 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]
†Diceratherium niobrarense Peterson 1906
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Invalid names: Metacaenopus egregius Cook 1908 [synonym]