A representative of Concestor 12 Laurasiotheres

'The first perissodactyls in North America, represented by Hyracotherium, appeared at the Paleocene/Eocene boundary at approximately 55.8 Ma. They appear as part of a Holarctic dispersal of modern orders of mammals, including the first primates and artiodactyls (Gingerich, 2006). This cosmopolitan modern fauna, originally distributed across the northern hemisphere, became subdivided by the North Atlantic at the end of the early Eocene and subsequently evolved in isolation (Hooker, 1994). The North American equoids evolved into the family Equidae, which later dispersed into the Old World during the Miocene, whereas the European equoids evolved into the Palaeotheriidae, a radiation of horse-like taxa that eventually went extinct during the early Oligocene (Rose, 2006).'