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Segisaurus
''Segisaurus'' (meaning "Segi canyon lizard") is a genus of small coelophysoid theropod dinosaur, that measured approximately 1 metre (3.3 feet) in length. The only known specimen was discovered in early Jurassic strata in Tsegi Canyon, Arizona, for which it was named. ''Segisaurus'' is the only dinosaur to have ever been excavated from the area.
==Description==
''Segisaurus'' lived about 183 million years ago during the Jurassic period. ''Segisaurus'' was roughly the size of a goose and was a primitive bipedal theropod. ''Segisaurus'' was roughly 1 meter (3.3 feet) long, half a meter (1.65 feet) tall and weighed about 4-7 kilograms. It was nimble and insectivorous, although it may have scavenged meat also. It was bird-like in structure, with a flexible, elongated neck and stout body. ''Segisaurus'' was three-toed and had powerful legs that were long compared to its body length. Like its legs, ''Segisaurus'' had a long tail and long forearms. Its collar bone was not unlike a bird's, thus strengthening scientists' arguments that dinosaurs were related to avians. ''Segisaurus'' is described from the only specimen ever found, the holotype UCMP 32101, which was a sub-adult. The full size of ''Segisaurus'' as an adult may never be known. Strangely, clavicles were found on the ''Segisaurus'' specimen, which were unknown in other dinosaurs from that era. A speculative interpretation by Charles Lewis Camp was that the "splint-like" neck ribs supported a ''Draco''-like patagium along the neck, to improve the animal's ability to move quickly.〔 ''Segisaurus'' is significant because it demonstrates that the clavicle was primitively present in early theropods.〔Chure, D. J., and Madsen, J. H., 1996, The furcula in Allosaurid Theropods and its implication for determining bird origins: Journal of Vertebrate Paleontology, v. 16, supplement to n. 3, Abstracts of Papers, Fifty-sixth Annual Meeting, Society of Vertebrate Paleontology, American Museum of Natural History, New York, New York, October 16-19, p. 28A.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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