Parahippus_leonesusMerychippus_primusParapliohippus_carizoensisAcritohippus_stylodontusAcritohippus_tertiusHeteropliohippus_hulbertiPliohippus_tehonenseAstrohippus_stockiPliohippus_permixDinohippus_leardiDinohippus_interplatusDinohippus_leidyanusDinohippus_mexicanusEquus_simplisidenseProtohippus_perditusCallippus_placidusScaphohippus_intermontanusScaphobIppus_sumaniMerychippus_insignisNeohipparion_coloradenseCormohipparion_goorisiOsteologyMaximum ParsimonyBased on reanalysis of the original matrix.Pagnac_2006a