(Pachycephalosauria,(Psittacosauridae,Chaoyangosaurus,Archaeoceratops,Graciliceratops,Bagaceratops,Protoceratops,Asiaceratops,Liaoceratops,(Montanoceratops,Prenoceratops,(Udanoceratops,Leptoceratops)),(Zuniceratops,(Centrosaurus,Triceratops))));