Classification of Colbert and Schoch 1998

†Tapiravus rarus Marsh 1877
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Subor. †Moropomorpha
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G. †Paleomoropus Radinsky 1964
G. †Schizotheriodes Hough 1955
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]
Invalid names: Chasmotheriodes [synonym]
G. †Dilophodon Scott 1883
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†Dilophodon minusculus Scott 1883
G. †Fouchia Emry 1989
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]
G. †Selenaletes Radinsky 1966
Fm. †Isectolophidae Peterson 1919
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G. †Cardiolophus Gingerich 1991
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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]
Invalid names: Systemodon Cope 1881 [synonym]
G. †Isectolophus Scott and Osborn 1887
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†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]
Superfm. Tapiroidea Gill 1872
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G. †Colodon Marsh 1890
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†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], Mesohippus longipes Osborn and Wortman 1894 [synonym]
†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]
G. †Heteraletes Peterson 1931
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†Heteraletes leotanus Peterson 1932
Fm. Tapiridae Gray 1821 [tapir]
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G. †Miotapirus Schlaikjer 1937
G. †Protapirus Filhol 1877
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†Protapirus hancocki Radinsky 1963
Invalid names: Plesiocolopirus Schoch 1989 [synonym], Tanyops Marsh 1894 [synonym]
G. †Tapiravus Marsh 1877
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†Tapiravus validus Marsh 1871
G. Tapirus Brisson 1762 [tapir]
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†Tapirus haysii Leidy 1860
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Invalid names: Tapirus copei Simpson 1945 [synonym]
†Tapirus merriami Frick 1921
Superfm. Rhinocerotoidea Gray 1821
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G. †Hyrachyus Leidy 1871
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†Hyrachyus affinis Marsh 1871
†Hyrachyus bicornutus Troxell 1922
†Hyrachyus eximius Leidy 1871
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Invalid names: Hyrachyus hypostylus Wood 1934 [synonym], Hyrachyus imperialis Osborn et al. 1878 [synonym], Hyrachyus princeps Marsh 1872 [synonym], Metahyrachyus troxelli Wood 1934 [synonym]
†Hyrachyus modestus Leidy 1870
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Invalid names: Colonoceras agrestis Marsh 1873 [synonym], Ephyrachyus cristalophus Wood 1934 [synonym], Hyrachyus agrarius Leidy 1871 [synonym], Hyrachyus agrestis Leidy 1871 [synonym], Hyrachyus crassidens Osborn et al. 1878 [synonym], Lophiodon bairdianus Marsh 1871 [synonym]
Invalid names: Chasmotherium Rutimeyer [synonym], Colonoceras Marsh 1873 [synonym], Ephyrachyus Wood 1934 [synonym], Metahyrachyus Troxell 1922 [synonym]
G. †Toxotherium Wood 1961
†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]
†Protapirus obliquidens Wortman and Earle 1893
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Invalid names: Tanyops undans Marsh 1894 [synonym]
†Tapirus veroensis Sellards 1918
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Invalid names: Tapirus excelsus Simpson 1945 [synonym]
†Toxotherium hunteri Wood 1961
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Invalid names: Schizotheriodes jackwilsoni Schiebout 1977 [synonym], Toxotherium woodi Skinner and Gooris 1966 [synonym]