LesothosaurusHypsilophodonStegocerasYinlongChaoyangsaurusXuanhuaceratopsP_sinensisP_mongoliensisLiaoceratopsAuroraceratopsArchaeoceratopsYamaceratopsAjkaceratopsAsiaceratopsKoreaceratopsCerasinopsMontanoceratopsLeptoceratopsPrenoceratopsUdanoceratopsHelioceratopsZhuchengceratopsUnescoceratopsGryphoceratopsZPAL_MgD_I156Protoceratops_helleniProtoceratops_andrewsiBagaceratopsMagnirostrisZuniceratopsTuranoceratopsDiabloceratopsCentrosaurusChasmosaurusTriceratopsStyracosaurusAquilopsMosaiceratopsHualianceratopsIschioceratopsStenopelixFerrisaurus_sustutensisOsteologyMaximum ParsimonyBased on reanalysis of the original matrix.Arbour_et_Evans_2019ab