(Protoceratops_andrewsi,(Turanoceratops_tardabilis,Zuniceratops_christopheri,(Diabloceratops_eatoni,Albertaceratops_nesmoi,Avaceratops_lammersi,Sinoceratops_zhuchengensis,(Centrosaurus_apertus,Centrosaurus_brinkmani,Styracosaurus_albertensis,Spinops_sternbergorum),(Rubeosaurus_ovatus,(Einiosaurus_procurvicornis,(Achelousaurus_horneri,(Pachyrhinosaurus_canadensis,Pachyrhinosaurus_lakustai)))),(Chasmosaurus_belli,Pentaceratops_sternbergii))));