Leptoceratops_gracilisProtoceratops_andrewsiZuniceratops_christopheriTuranoceratops_tardabilisAvaceratops_lammersiCentrosaurus_apertusStyracosaurus_albertensisEiniosaurus_procurvicornisAchelousaurus_horneriPachyrhinosaurusJudiceratops_tigrisChasmosaurusMojoceratops_perifaniaAgujaceratops_mariscalensisPentaceratops_sternbergiUtahceratops_gettyiKosmoceratops_richardsoniAnchiceratops_ornatusArrhinoceratops_brachyopsTitanoceratops_ouranosTorosaurusTriceratopsEotriceratops_xerinsularisCoahuilaceratops_magnacuernaOsteologyMaximum ParsimonyBased on reanalysis of the original matrix.Campbell_2015ab