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Ornithischia Division Ornithischia Categories Ornithischia or Predentata is an extinct order of beaked, herbivorous dinosaurs. The name ornithischia is derived from the Greek ornitheos meaning 'of a bird' and ischion meaning 'hip joint'. They are known as the 'bird-hipped' dinosaurs because of their bird-like hip structure, even though birds actually descended from the 'lizard-hipped' dinosaurs (the saurischians). Being herbivores that sometimes lived in herds, they were more numerous than the saurischians. They were prey animals for the theropods and were smaller than the sauropods. The ornithischians are divided into two suborders: the Cerapoda and the Thyreophora.The Cerapoda include the Infraorders Ceratopsia, Pachycephalosauria and Ornithopoda (among which duck-bills (hadrosaurs) such as Edmontosaurus). The Thyreophora include the Stegosauria (like the armored Stegosaurus) and the Ankylosauria (like Ankylosaurus). |
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