Classification of Schoch 1989

Subor. †Ceratomorpha Wood 1937
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G. †Desmatotherium Scott 1883
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†Desmatotherium intermedius Osborn et al. 1878
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Invalid names: Desmatotherium guyotii Scott 1883 [synonym]
G. †Dilophodon Scott 1883
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†Dilophodon minusculus Scott 1883
G. †Isectolophus Scott and Osborn 1887
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†Isectolophus latidens Osborn et al. 1878
Invalid names: Parisectolophus Peterson 1919 [synonym]
G. †Colodon Marsh 1890
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†Colodon kayi Hough 1955
†Colodon woodi Gazin 1956
G. †Helaletes Marsh 1872
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†Helaletes nanus Marsh 1871
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Invalid names: Helaletes boops Marsh 1872 [synonym]
Fm. Tapiridae Gray 1821 [tapir]
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G. †Plesiocolopirus Schoch 1989
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†Plesiocolopirus hancocki Radinsky 1963
G. †Hyrachyus Leidy 1871
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†Hyrachyus modestus Leidy 1870
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Invalid names: Hyrachyus agrestis Leidy 1871 [synonym]
†Colodon occidentalis Leidy 1868
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Invalid names: Colodon luxatus Marsh 1890 [synonym]
†Heptodon calciculus Cope 1880
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Invalid names: Lophiodon ventorum Cope 1880 [synonym]
†Homogalax protapirinus Wortman 1896
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Invalid names: Systemodon primaevus Wortman 1896 [synonym]
†Toxotherium hunteri Wood 1961
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Invalid names: Schizotheriodes jackwilsoni Schiebout 1977 [synonym], Toxotherium woodi Skinner and Gooris 1966 [synonym]