#order_Ornithischia__Ornithischia  extinct terrestrial reptiles having birdlike pelvises: armored dinosaurs (thyreophorans); bone-headed and horned dinosaurs (marginocephalians); duck-billed dinosaurs (euronithopods)
  supertype:  animal_order  the order of animals
  member of:  subclass_Archosauria
  member:  ornithischian_dinosaur__ornithischiandinosaur__ornithischian  herbivorous dinosaur with a pelvis like that of a bird
  member:  genus_Pisanosaurus  primitive ornithischian dinosaur found in Argentina; early Triassic
     member:  pisanosaur__pisanosaurus  primitive dinosaur found in Argentina
  member:  genus_Staurikosaurus  primitive ornithischian dinosaur found in Brazil
     member:  staurikosaur__staurikosaurus  primitive dinosaur found in Brazil
  member:  suborder_Thyreophora__Thyreophora__thyreophoran  armored dinosaurs: stegosaurs and ankylosaurs
     member:  armored_dinosaur__armoreddinosaur  dinosaurs having bony armour
     member:  genus_Stegosaurus  quadrupedal armored herbivore of the Jurassic and Cretaceous
        member:  stegosaur__stegosaurus__stegosauru__Stegosaur_stenops  herbivorous ornithischian dinosaur with a row of bony plates along its back and a spiked tail probably used as a weapon
     member:  genus_Ankylosaurus  armored herbivorous dinosaurs of the Cretaceous
        member:  ankylosaur__ankylosaurus  having the back covered with thick bony plates; thought to have walked with a sprawling gait resembling a lizard's
        member:  Edmontonia  heavily armored and highly spiked dinosaur with semi-upright posture
  member:  suborder_Marginocephalia__Marginocephalia__marginocephalian  includes bone-headed (pachycephalosaurs) and horned (ceratopsian) dinosaurs
     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
  member:  suborder_Euronithopoda__Euronithopoda__euronithopod__Ornithopoda__suborder_Ornithopoda  widespread group including duck-billed dinosaurs and their early relatives (hadrosaurs; trachodon; iguanodon)
     member:  ornithopod_dinosaur__ornithopod  bipedal herbivorous dinosaur
     member:  family_Hadrosauridae__Hadrosauridae  duck-billed dinosaurs; upper Cretaceous
        member:  hadrosaur__hadrosaurus__hadrosauru__duck-billed_dinosaur  any of numerous large bipedal ornithischian dinosaurs having a horny duck-like bill and webbed feet; may have been partly aquatic
        member:  genus_Anatotitan  genus of large duck-billed dinosaurs; late Cretaceous
           member:  anatotitan  one of the largest and most famous duck-billed dinosaurs
        member:  genus_Corythosaurus  genus of duck-billed dinosaurs of late Cretaceous
           member:  corythosaur__corythosaurus__corythosauru  duck-billed dinosaur with nasal passages that expand into a crest like a hollow helmet
        member:  genus_Edmontosaurus  duck-billed dinosaurs of Canada
           member:  edmontosaurus__edmontosauru  duck-billed dinosaur from Canada found as a fossilized mummy with skin
     member:  genus_Trachodon  a reptile genus of the suborder Euronithopoda
        member:  trachodon__trachodont  large duck-billed dinosaur of the Upper Cretaceous
     member:  family_Iguanodontidae__Iguanodontidae  iguanodons
        member:  genus_Iguanodon  type genus of the Iguanodontidae
           member:  iguanodon  massive herbivorous bipedal dinosaur with a long heavy tail; common in Europe and North Africa; early Cretaceous

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