HypsilophodonStegocerasArchaeoceratopsAsiaceratopsBagaceratopsChaoyangsaurusCentrosaurusLeptoceratopsGraciliceratopsMontanoceratopsProtoceratopsPsit_dot__mongol_dot_TriceratopsUdanoceratopsZuniceratopsLiaoceratopsPsit_dot__sinensisXuanhuaceratopsYamaceratopsPrenoceratopsCerasinopsYinlongAuroraceratopsOsteologyMaximum ParsimonyBased on reanalysis of the original matrix.VanBuren_etal_2015a