ProtoceratopsZuniceratopsChasmosaurusTriceratopsDiabloceratopsAlbertaceratopsC_brinkmaniC_apertusStyracosaurusRubeosaurusEiniosaurusAchelousaurusTMP_2002_dot_76_dot_1P_lakustaiP_canadensisP_perotorumOsteologyMaximum ParsimonyBased on reanalysis of the original matrix.Fiorillo_et_Tykoski_2012a