ERTH 2401 Lecture : Lecture11-chapter7Ornithopoda .doc
11 Apr 2012
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Fossil record excellent: ornithopod birdfoot, world-wide distribution, group ornithischian dinosaurs. Iguana lizard, don tooth: discovered 1922 teeth from iguanodon ( lizard tooth) in england, 25 years later leidy discovered hadrosaurus (hadro stout) 31 complete specimens of iguanodon buried in a coal seam (ecosystem vegetation: china has a lot energy stations which uses coal large coal pits are excavated and the fossils were discovered not destroyed, continuous discoveries, ca. 80 species described constant new species discovered: iguanodon display - large what would you do to take it down, hunting in packs evidence in bonebeds. Ornithopoda 2 groups: heterodontosauridae, heterodontosaurus, bipedal, lanasaurus. Euornithopoda: hypsilophodontidae, iguanodontidae, high crowned teeth, a large canine-like tooth in upper and lower jaws, skull features, absence of prominent boss in cheek region, high angle between prepubic process and body of pubis. Yandusaurus, middle jurassic china: othnielia, late jurassic western interior, orodromeus, late cretaceous montana, hysilophodon, early cretaceous england, othnielia.
