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