YumacerasYumaceras is an extinct genus of antelope-like palaeomerycid artiodactyl endemic to North America from the Miocene epoch, 13.6—5.33 Ma, existing for approximately.TaxonomyYumaceras was named by Frick. It was synonymized subjectively with Pediomeryx by Savage and Janis and Manning ; it was reranked as Pediomeryx by Webb ; it was synonymized subjectively with Cranioceras by Tedford et al.. It was assigned to Pediomeryx by Webb ; and to Cranioceratini by Prothero and Liter.Fossil distributionNorris Canyon, Contra Costa County, CaliforniaCambridge Site, Frontier County, NebraskaHaile V/XIXA, Alachua County, Florida