title: Review of horses in Paleoindian sites of the Americas.
abstract: Analysis of the morphological characters in North and South American horses present during Paleoindian time indicates that at least eight Equus ecospecies occurred in North America. In South America, Equus had radiated into four ecospecies, Hippidion had one, and Onohippidium had three geographically separate ecospecies. These species are found in archeological deposits ranging from ca. 13,000 to 8,000 yr B.P., in tropical habitats as well as in the high Andean and Patagonian colder ecotopes.
authors.forename: Mario
authors.initials: M
authors.lastname: Pichardo
mesh_terms: D000569:Americas; D000818:Animals; D005075:Biological Evolution; D001842:Bone and Bones / Q000033:anatomy & histology*; D002980:Climate; D017753:Ecosystem; D005580:Fossils; D049690:History, Ancient; D006736:Horses / Q000033:anatomy & histology* / Q000145:classification; D010161:Paleodontology; D010164:Paleopathology; D013045:Species Specificity; D014070:Tooth / Q000033:anatomy & histology*