#suborder_Marginocephalia__Marginocephalia__marginocephalian  includes bone-headed (pachycephalosaurs) and horned (ceratopsian) dinosaurs
  supertype:  animal_order  the order of animals
  member of:  order_Ornithischia
  member:  suborder_Pachycephalosaurus  bone-headed dinosaurs; late Cretaceous
     member:  bone-headed_dinosaur  bipedal herbivorous dinosaurs with bony crowns
  member:  suborder_Ceratopsia__Ceratopsia  horned dinosaurs
     member:  ceratopsian__horned_dinosaur  any of several four-footed herbivorous horned dinosaurs with enormous beaked skulls; of the late Cretaceous in North America and Mongolia
     member:  family_Ceratopsidae__familyceratopsidae__Ceratopsidae  American ceratopsian dinosaurs
     member:  genus_Protoceratops  small horned dinosaurs
     member:  genus_Triceratops  genus of herbivorous horned dinosaurs
        member:  triceratops__triceratop  huge ceratopsian dinosaur having three horns and the neck heavily armored with a very solid frill
     member:  genus_Styracosaurus  genus of horned dinosaurs
        member:  styracosaur__styracosaurus__styracosauru  an unusual ceratopsian dinosaur having many large spikes around the edge of its bony frill and a long nose horn; late Cretaceous
     member:  genus_Psittacosaurus  most primitive genus of horned dinosaurs; early Cretaceous
        member:  psittacosaur__psittacosaurus  primitive dinosaur actually lacking horns and having only the beginning of a frill; long hind and short front limbs; may have been bipedal

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