(Hypsilophodon_foxi,(Stegoceras_validus,(Chaoyangsaurus_youngi,((Liaoceratops_yanzigouensis,(Archaeoceratops_oshimai,((Asiaceratops_salsopaludalis,(Montanoceratops_cerorhynchus,(Leptoceratops_gracilis,Udanoceratops_tshizhovi))),(Graciliceratops_gobiensis,((Bagaceratops_rozhdestvenskyi,Protoceratops_andrewsi),(Zuniceratops_christopheri,(Centrosaurus_apertus,Triceratops_horridus))))))),(Psittacosaurus_mongoliensis,Psittacosaurus_sinensis)))));