出典:Wikipedia
出典:『Wikipedia』 (2011/02/09 20:55 UTC 版)
Leptoreodon is a small extinct genus of Artiodactyla, of the family Protoceratidae, endemic to North America from the Eocene epoch (Uintan to Duchesnean stage) 40.2—33.9 Ma, existing for approximately 6.3 million years.