Classification of the species Hippotherium peninsulatum
†Nannippus peninsulatus Cope 1885
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Invalid names: Equus minutus Cope 1893 [synonym], Equus phlegon Hay 1899 [synonym], Hipparion cragini Hay 1917 [synonym], Nannippus hesperides Mooser 1968 [synonym], Nannippus montezumae Leidy 1882 [synonym]