(Hypsilophodon_foxi,(Stegoceras_validus,(((Liaoceratops_yanzhiguouensis,(Archaeoceratops_oshimai,Asiaceratops_salsopaludalis,Yamaceratops_gobiensis,(Graciliceratops_mongoliensis,((Bagaceratops_rozhdestvenskyi,Protoceratops_andrewsi),(Zuniceratops_christopheri,(Centrosaurus_apertus,Triceratops_horridus)))),(Montanoceratops_cerorhynchus,(Leptoceratops_gracilis,Udanoceratops_tahizhovi,Prenoceratops_peiganensis)))),(Psittacosaurus_mongoliensis,Psittacosaurus_sinensis)),(Chaoyangsaurus_youngi,IVPP_V12722))));