YinlongStenopelixWannanosaurusGoyocephaleHomalocephaleStegoceras_validumS_novomexicanumTylocephalePrenocephale_prenesP_brevisP_edmontonensisP_goodwiniColepiocephaleHanssuesiaStygimolochDracorex_plus_Sandy_Site_pachyPachycephalosaurusAmtocephaleOsteologyMaximum ParsimonyBased on reanalysis of the original matrix.Watabe_etal_2011a