OutgroupcentrosaurinesOther_chasmosaurinesChasmosaurus_mariscalensisPentaceratops_sternbergiChasmosaurus_russelliChasmosaurus_irvinensisChasmosaurus_belliOsteologyMaximum ParsimonyBased on reanalysis of the original matrix.Holmes_etal_2001aaHolmes_etal_2001ab