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Stegopelta
''Stegopelta'' (meaning "roofed shield") is a genus of armored dinosaur. It is based on a partial skeleton from the latest Albian-earliest Cenomanian-age Lower and Upper Cretaceous Belle Fourche Member of the Frontier Formation of Fremont County, Wyoming, USA.
==History==
In 1905, Samuel Wendell Williston described FMNH UR88, a partial armored dinosaur skeleton consisting of a maxilla fragment, seven cervical and two dorsal vertebrae, part of a sacrum and both ilia, caudal vertebrae, parts of the scapulae, both humeral heads, portions of an ulna and both radii, a metacarpal, partial tibia, metatarsal, and armor including a shoulder spine and neck ring.〔Carpenter, K., and Kirkland, J.I. (1998). Review of Lower and middle Cretaceous ankylosaurs from North America. In: Lucas, S.G., Kirkland, J.I., and Estep, J.W. (eds.). ''Lower and Middle Cretaceous Terrestrial Ecosystems''. ''New Mexico Museum of Natural History and Science Bulletin'' 14:249-270.〕 The specimen was in poor condition, as it had eroded from a slope and been walked on by cattle. Ankylosaurians being very poorly known, Williston compared his new genus to ''Stegosaurus'', and the armor to that of ''Glyptodon'';〔 like that mammal, ''Stegopelta'' had a fused section of armor (in its case over the pelvis). Roy Lee Moodie redescribed it in 1910, and considered it to be close to, if not the same as, ''Ankylosaurus''.〔
The genus fell into obscurity. Walter Coombs synonymized it with the more famous but equally poorly known ''Nodosaurus'' in his 1978 redescription of the Ankylosauria. It was reinstated as a valid genus by Ken Carpenter and James Kirkland (1998), who recognized it as having distinct vertebral and armor characteristics.〔 Tracy Ford took this farther in 2000, assigning it to a new subfamily in Ankylosauridae based on armor characteristics, which he called Stegopeltinae. Also included was ''Glyptodontopelta''.〔Ford, T.L. (2000). A review of ankylosaur osteoderms from New Mexico and a preliminary review of ankylosaur armor. In: Lucas, S.G., and Heckert, A.B. (eds.). ''Dinosaurs of New Mexico''. ''New Mexico Museum of Natural History and Science Bulletin'' 17:157-176.〕 This has not been generally accepted, but most recent reviews have accepted ''Stegopelta'' as a distinct genus with uncertain affinities.〔Carpenter, K. (2001). Phylogenetic analysis of the Ankylosauria. In: Carpenter, K. (ed.). ''The Armored Dinosaurs''. Indiana University Press:Bloomington, 455-483. ISBN 0-253-33964-2〕〔Vickaryous, M.K., Maryańska, T., and Weishampel, D.B. (2004). Ankylosauria. In: Weishampel, D.B., Dodson, P., and Osmólska, H. (eds.). ''The Dinosauria'' (second edition). University of California Press:Berkeley, 363-392. ISBN 0-520-24209-2〕
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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