Classification of Holbrook 1999

Or. Perissodactyla Owen 1848 [odd-toed ungulate]
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G. †Cardiolophus Gingerich 1991
Superfm. †Chalicotherioidea Gill 1872
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Fm. †Chalicotheriidae Gill 1872 [chalicothere]
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G. †Moropus Marsh 1877
Fm. †Eomoropidae Matthew 1929
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G. †Eomoropus Osborn 1913
G. †Homogalax Hay 1899
Subor. Tapiromorpha Haeckel 1873
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Infraor. †Ceratomorpha Wood 1937
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Superfm. Rhinocerotoidea Gray 1821
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Fm. †Amynodontidae Scott and Osborn 1883
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G. †Amynodon Marsh 1877
G. †Rostriamynodon Wall and Manning 1986
G. †Forstercooperia Wood 1939
Fm. †Hyrachyidae Osborn 1892
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G. †Hyrachyus Leidy 1871
Fm. †Hyracodontidae Cope 1879
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G. †Hyracodon Leidy 1856
G. †Triplopus Cope 1880
Fm. †Indricotheriidae Borissiak 1923
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G. †Paraceratherium Forster Cooper 1911
G. †Juxia Chow and Chiu 1964
Fm. Rhinocerotidae Gray 1821 [rhinoceros]
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G. †Subhyracodon Wood 1927
G. †Teletaceras Hanson 1989
G. †Trigonias Lucas 1900
G. †Uintaceras Holbrook and Lucas 1997
Superfm. Tapiroidea Gill 1872
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Fm. †Deperetellidae Radinsky 1965
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G. †Deperetella Matthew and Granger 1925
Fm. †Helaletidae Osborn 1892
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G. †Colodon Marsh 1890
G. †Helaletes Marsh 1872
G. †Plesiocolopirus Schoch 1989
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†Plesiocolopirus hancocki Radinsky 1963
Fm. †Lophialetidae Matthew and Granger 1925
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G. †Lophialetes Matthew and Granger 1925
G. †Schlosseria Matthew and Granger 1926
Fm. Tapiridae Gray 1821 [tapir]
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G. †Protapirus Filhol 1877
G. Tapirus Brisson 1762 [tapir]
Invalid names: Heptodontidae Holbrook 1999 [empty]
Fm. †Isectolophidae Peterson 1919
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G. †Isectolophus Scott and Osborn 1887