Classification of Merriam et al. 1925

G. †Hipparion de Christol 1832
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†Hipparion leptode Merriam 1915
†Hipparion molle Merriam 1915
†Hipparion montezuma Leidy 1882
†Hipparion occidentale Leidy 1856
†Hipparion sinclairi Wortman 1882
G. †Pliohippus Marsh 1874
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†Pliohippus spectans Cope 1880
G. †Citellus Oken 1816
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†Citellus gidleyi Merriam et al. 1925