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