(Hypsilophodon_foxi,(Stegoceras_validus,(((Liaoceratops_yanzhiguouensis,(Yamaceratops_gobiensis,(Archaeoceratops_oshimai,(Koreaceratops_hwaseongensis,((Graciliceratops_mongoliensis,((Bagaceratops_rozhdestvenskyi,Protoceratops_andrewsi),(Zuniceratops_christopheri,(Centrosaurus_apertus,Triceratops_horridus)))),(Cerasinops_hodgskissi,(Leptoceratops_gracilis,Montanoceratops_cerorhynchus,Udanoceratops_tahizhovi,Prenoceratops_peiganensis))))))),(Psittacosaurus_mongoliensis,Psittacosaurus_sinensis)),(Chaoyangsaurus_youngi,Xuanhuaceratops_niei))));