LesothosaurusHypsilophodonStegocerasYinlongChaoyangsaurusXuanhuaceratopsP_sinensisP_mongoliensisLiaoceratopsAuroraceratopsArchaeoceratopsArchaoCAGSYamaceratopsAjkaceratopsAsiaceratopsKoreaceratopsCerasinopsMontanoceratopsLeptoceratopsPrenoceratopsUdanoceratopsHelioceratopsZhuchengceratopsUnescoceratopsGryphoceratopsZPAL_MgD_I156Protoceratops_helleniProtoceratops_andrewsiBagaceratopsMagnirostrisZuniceratopsTuranoceratopsDiabloceratopsCentrosaurusChasmosaurusTriceratopsStyracosaurusAquilopsMosaiceratopsHualianceratopsIschioceratopsStenopelixOsteologyMaximum ParsimonyBased on reanalysis of the original matrix.Morschhauser_etal_2018a