Classification of Radinsky 1963

G. †Hyracotherium Owen 1841
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Invalid names: Systemodon Cope 1881 [synonym]
Superfm. Tapiroidea Gill 1872
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Fm. †Helaletidae Osborn 1892
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G. †Colodon Marsh 1890
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†Colodon cingulatus Douglass 1902
†Colodon hancocki Radinsky 1963
†Colodon kayi Hough 1955
†Colodon occidentalis Leidy 1868
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Invalid names: Colodon dakotensis Osborn and Wortman 1895 [synonym], Colodon luxatus Marsh 1890 [synonym], Colodon procuspidatus Osborn and Wortman 1895 [synonym]
†Colodon woodi Gazin 1956
G. †Dilophodon Scott 1883
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†Dilophodon leotanus Peterson 1932
†Dilophodon minusculus Scott 1883
Invalid names: Heteraletes Peterson 1931 [synonym]
G. †Helaletes Marsh 1872
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†Helaletes intermedius Osborn et al. 1878
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Invalid names: Desmatotherium guyotii Scott 1883 [synonym]
†Helaletes nanus Marsh 1871
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Invalid names: Helaletes boops Marsh 1872 [synonym]
Invalid names: Chasmotheroides Wood 1934 [synonym], Desmatotherium Scott 1883 [synonym]
G. †Heptodon Cope 1882
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†Heptodon calciculus Cope 1880
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Invalid names: Lophiodon ventorum Cope 1880 [synonym]
†Heptodon posticus Cope 1882
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Invalid names: Heptodon brownorum Seton 1931 [synonym]
Fm. †Isectolophidae Peterson 1919
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G. †Homogalax Hay 1899
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†Homogalax protapirinus Wortman 1896
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Invalid names: Systemodon primaevus Wortman 1896 [synonym]
G. †Isectolophus Scott and Osborn 1887
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†Isectolophus annectens Scott and Osborn 1887
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Invalid names: Homogalax uintensis Troxell 1922 [synonym], Isectolophus scotti Peterson 1919 [synonym], Schizolophodon cuspidens Peterson 1919 [synonym]
†Isectolophus latidens Osborn et al. 1878
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Invalid names: Homogalax bridgerensis Troxell 1922 [synonym]
Invalid names: Parisectolophus Peterson 1919 [synonym], Schizolophodon Peterson 1919 [synonym]
Fm. †Lophiodontidae Gill 1872
Fm. Tapiridae Gray 1821 [tapir]
Invalid names: Systemodon semihians Cope 1882 [nomen dubium]