A North American perissodactyl.
'Hyracotherium and, to a lesser extent, Heptodon, the two best-known Wasatchian perissodactyls, often have been used as proxies for the primitive perissodactyl morphotype. New information on other Eocene perissodactyls helps to confirm the primitive nature of some features and provide further evidence for character states present in the hypothetical ancestor of Perissodactyla. Rose (1996) pointed out a number of features of the post-crania of Homogalax that were more primitive than those of Hyracotherium, including some suggesting a lesser degree of cursorial specialization in Homogalax.' Holbrook et al. (2004)