Classification of Holbrook et al. 2004

Unr. Tapiromorpha Haeckel 1873
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Unr. †Ceratomorpha Wood 1937
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Superfm. Rhinocerotoidea Gray 1821
Superfm. Tapiroidea Gill 1872
Fm. †Isectolophidae Peterson 1919
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G. †Cardiolophus Gingerich 1991
G. †Homogalax Hay 1899
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†Homogalax protapirinus Wortman 1896
G. †Isectolophus Scott and Osborn 1887
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†Isectolophus annectens Scott and Osborn 1887
†Isectolophus latidens Osborn et al. 1878
Invalid names: Moropomorpha [synonym]