PhenacodontidsRadinskyaPhenacolophidsTethytheresHyracoidsHallensiaH_leporinumPalaeosyopsLambdotheriumPalaeotheriidaeCeratomorphaAncylopodaIsectolophusHomogalaxCardiolophusOrientolophusCymbalophusBighorn_lophoidSystemodonSifrhippusArenahippus_grangeriArenahippus_pernixMinippus_jicarillaiMinippus_indexArenahippus_aemulorXenicohippus_craspedotumBighorn_largeKihm_sp_DXenicohippus_grangeriXenicohippus_osborniEohippus_angustidensH_seekinsiKihm_sp_AKihm_sp_BKihm_sp_CKihm_sp_EKihm_sp_FPliolophus_vulpicepsProtorohippus_montanumProtorohippus_cf_venticolumProtorohippus_venticolumWR_mediumLysiteWR_mediumLCWind_River_smallProtorohippus_aff_venticolumOrohippus_majorOrohippus_pumilusEpihippusOsteologyMaximum ParsimonyBased on reanalysis of the original matrix.Froehlich_2002a