Leptoceratops_gracilisProtoceratops_andrewsiZuniceratops_christopheriTuranoceratops_tardabilisAlbertaceratops_nesmoiCentrosaurus_apertusPachyrhinosaurus_lakustaiChasmosaurus_belliChasmosaurus_russelliMojoceratops_perifaniaVagaceratops_irvinensisKosmoceratops_richardsoniAgujaceratops_mariscalensisUtahceratops_gettyiPentaceratops_sternbergiiCoahuilaceratops_magnacuernaAnchiceratops_ornatusArrhinoceratops_brachyopsOjoceratops_fowleriTorosaurus_latusTorosaurus_utahensisEotriceratops_xerinsularisNedoceratops_hatcheriTriceratops_horridusTriceratops_prorsusBravoceratops_polyphemusTitanoceratops_ouranosHellboyOsteologyMaximum ParsimonyBased on reanalysis of the original matrix.Brown_et_Henderson_2015ab