Dryosaurus (the name is from the vague oak shape of its cheek teeth, making the name mean "Oak Lizard".) is a genus of an ornithopod dinosaur that lived in the Late Jurassicperiod. It was an iguanodont (formerly classified as a hypsilophodont). Fossils have been found in the western United States, and were first discovered in the late 19th century.Valdosaurus canaliculatus and Dysalotosaurus lettowvorbecki were both formerly considered to represent species of Dryosaurus.
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