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