Ceratopsia Leptoceratops Marginocephalia Styracosaurus Zuniceratops Chaoyangsaurus Yinlong Wannanosaurus Beg tse Pentaceratops Homalocephale Stygimoloch Pachycephalosauria Centrosaurinae Ceratopsidae Centrosaurus Pachycephalosaurus Psittacosaurus Triceratops