ERTH 2104 Lecture 10: Ornithopoda
14 Dec 2019
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Document Summary
History of discovery: teeth and bones in england, however body form was still not well understood in earlier decades. 1820"s - 1830"s, gideon mantell discovered iguanodon. Hadrosaurus becomes the first dinosaur mounted on display in a museum. Over 30 skeletons of iguanodon in a coal seam (lots of vegetation), anatomy becomes completely. Lower position of the jaw joint and ventral margin of premaxilla with respect to the maxilla. Traditional paraphyletic grade of non-iguanodont ornithopods (consisting of descendants of last. Some jurassic ornithischians usually included in this group. Characteristic features (not all appear simultaneously in this clade) Generally larger and more heavily built than basal ornithopods (up to 15 m long) Hoof-like unguals, reduction in a number of phalanges/digits. North and south america, europe, asia, antarctica. In cretaceous they were in a greenhouse world not ice house like us. Bipedal terrestrial stance but could have quadrupedal stance as well when feeding or standing.
