Classification of Scott 1941
G. †Peratherium Aymard 1850
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Invalid names: Embassis Cope 1873 [synonym], Herpetotherium Cope 1873 [synonym], Miothen Cope 1873 [synonym]
G. †Mesohippus Marsh 1875
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†Mesohippus bairdii Leidy 1850
†Mesohippus celer Marsh 1874
†Mesohippus cuneatus Cope 1873
†Mesohippus exoletus Cope 1874
†Mesohippus meteulophus Osborn 1904
†Mesohippus westoni Cope 1889
G. †Miohippus Marsh 1874
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G. †Brontops Marsh 1887
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†Brontops amplus Marsh 1890
†Brontops bicornutus Osborn 1902
Invalid names: Diploclonus Marsh 1890 [synonym]
G. †Colodon Marsh 1890
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G. †Hyracodon Leidy 1856
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†Hyracodon nebraskensis Leidy 1850
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Invalid names: Hyracodon apertus Sinclair 1922 [synonym], Hyracodon arcidens Cope 1873 [synonym], Hyracodon leidyanus Troxell 1921 [synonym], Hyracodon priscidens Lambe 1905 [synonym], Hyracodon selenidens Troxell 1921 [synonym]
G. †Amphicaenopus Wood 1927
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†Amphicaenopus platycephalus Osborn and Wortman 1894
G. †Diceratherium Marsh 1875
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†Diceratherium tridactylum Osborn 1893
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Invalid names: Diceratherium avum Wood 1927 [synonym], Diceratherium proavitum Hatcher 1894 [synonym], Subhyracodon metalophum Wood 1927 [synonym]
G. †Subhyracodon Wood 1927
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†Subhyracodon copei Osborn 1898
†Subhyracodon occidentalis Leidy 1850
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Invalid names: Hyracodon quadriplicatus Cope 1873 [synonym]
†Subhyracodon trigonodus Osborn and Wortman 1894
Invalid names: Anchisodon Cope 1879 [synonym], Leptaceratherium Osborn 1898 [synonym]
G. †Epoicotherium Simpson 1927
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†Epoicotherium unicum Douglass 1905
Invalid names: Xenotherium Douglass 1905 [replaced]
G. †Caenopus Cope 1880
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†Caenopus mitis Cope 1875
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Invalid names: Caenopus pumilus Cope 1886 [synonym], Hyracodon planiceps Scott and Osborn 1887 [synonym]
†Caenopus premitis Gregory and Cook 1928
Invalid names: Procaenopus Figgins 1934 [synonym]
†Colodon dakotensis Osborn and Wortman 1895
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Invalid names: Colodon procuspidatus Osborn and Wortman 1895 [synonym]
G. †Menodus Pomel 1848
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Invalid names: Diconodon Marsh 1876 [synonym], Menops Marsh 1887 [synonym], Titanotherium Leidy 1852 [synonym]
†Metamynodon planifrons Scott and Osborn 1887
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Invalid names: Metamynodon rex Troxell 1921 [synonym]
G. †Pediohippus Schlaikjer 1935
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†Pediohippus brachystylus Osborn 1904
†Pediohippus gidleyi Osborn 1904
†Pediohippus intermedius Osborn and Wortman 1895
†Pediohippus portentus Douglass 1908
†Pediohippus trigonostylus Osborn 1918
†Peratherium fugax Cope 1873
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Invalid names: Herpetotherium scalare Cope 1873 [synonym], Herpetotherium tricuspis Cope 1873 [synonym]
†Peratherium huntii Cope 1873
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Invalid names: Didelphys pygmaea Scott 1894 [synonym], Herpetotherium stevensonii Cope 1873 [synonym], Miothen gracile Cope 1873 [synonym]
†Trigonias osborni Lucas 1900
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Invalid names: Trigonias cooki Wood 1931 [synonym], Trigonias gregoryi Wood 1927 [synonym], Trigonias hypostylus Gregory and Cook 1928 [synonym], Trigonias paucidens Wood 1927 [synonym], Trigonias precopei Gregory and Cook 1928 [synonym], Trigonias preoccidentalis Gregory and Cook 1928 [synonym], Trigonias tetradactylum Osborn 1923 [synonym], Trigonias wellsi Wood 1927 [synonym]