Hyracotherium was previously called Eohippus (meaning "dawn horse"). It is a Eurasian species, a Palaeothere. That group is ancestral to the horses and brontotheres. Therefore, it is not the same animal as Eohippus, which is the earliest horse.
?Eohippus Marsh, 1876
Hyracotherium lived during the early Eocene epoch, about 55–45 million years ago. It lived in the northern hemisphere in Asia and Europe. The first fossils of this tiny animal were found in England by Richard Owen in 1841 and named Hyracotherium.
- Froehlich D.J. (2002). "Quo vadis eohippus? The systematics and taxonomy of the early Eocene equids (Perissodactyla)". Zoological Journal of the Linnean Society. 134 (2): 141–256. doi:10.1046/j.1096-3642.2002.00005.x.
- Hooker J.J. (1994). "The beginning of the equoid radiation". Zoological Journal of the Linnean Society. 112 (1–2): 29–63. doi:10.1006/zjls.1994.1033.