ドライオサウルス Dryosaurus オーストラリア恐竜大陸
Ornithischia / Genasauria / Cerapoda / Ornithopoda / Drymorpha
/ Family: Dryosauridae
First Described: 1894 / Found: North America：USA; Africa：Tanzania
/ Length: 3m / Weirht: 80kg
/ Food: Plants / Young: Eggs
/ Lived: Late Jurassic 154－146 mya
Apart from being a lot bigger, the 'Oak lizard' was quite similar to Hypsilophodon in overall appearance. It was two‑ legged with short arms and is best described as lightly built and agile. The head was quite deep, with sharp, deeply ridged teeth like those of its distant cousin. According to some scientists, Dryosaurus is the last ornithopod to have had short arms.
Like the Hypsilophocion and Leaellynasaura, Dryosaurus had large eyes and was probably quite intelligent. It lived in groups or small herds and used its keen eyesight and speed to avoid being caught and eaten. Adult specimens may have reached 4 m in length. Dryosaurus had a relatively long neck and slim body balanced by a long, stiffened tail.
It may seem strange that an animal is known from fossils found in two countries that are now separated by thousand of miles of land and sea.
During the late Jurassic, however, the American and African continents were joined together, and it was possible for even the smallest dinosaurs to exist over a large area during a million years or so of Earth's history.