(Hypsilophodon_foxii,(Stegoceras_validum,(Psittacosaurus_mongoliensis,(Chaoyangsaurus_youngi,(Archaeoceratops_oshimai,(((Leptoceratops_gracilis,Montanoceratops_cerorhynchus),(Triceratops_horridus,Centrosaurus_apertus)),(Bagaceratops_rozhdestvenskyi,Protoceratops_andrews)))))));