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''Arstanosaurus'' (meaning "Arstan lizard" after the Arstan well) is a genus of hadrosaurid dinosaur from the Santonian-Campanian-age Upper Cretaceous Bostobinskaya Formation, Kazakhstan. It has had a confusing history, being considered both a hadrosaurid and a ceratopsid, or both at the same time (chimeric). ==History== The genus was based on a partial left maxilla (holotype AAIZ 1/1 or IZ AN KSSR 1/1), with the lower end of a left femur (AAIZ 1/2) possibly referable. Both were found at Akkurgan-Boltyk near Qyzylorda.〔Shilin, F.V., and Suslov, Y.V. (1982). A hadrosaur from the northeastern Aral Region. ''Paleontological Journal'' 1982(1):132-136 (version ).〕 This is not much material for naming a new genus, and it was largely ignored until the mid-1990s, when the hypothesis that it was really a ceratopsid appeared.〔Nesov, L.A. (1995). ''Dinozavri severnoi Yevrasii: Novye dannye o sostave kompleksov, ekologii i paleobiogeografii'' (of Northern Eurasia: new data about assemblages, ecology and paleobiogeography'' ). ''Scientific Research Institute of the Earth's Crust''. St. Petersburg State University:St. Petersburg, Russia, 156 pp. + 14 pl. ().〕 Shortly thereafter, a new revision appeared that showed that the characteristics listed as unusual for ''Arstanosaurus'' were really based on perspective, and that the maxilla was from an animal like ''Bactrosaurus'', albeit indeterminate (a dubious name). The femur was uninformative.〔Norman, D.B., and Kurzanov, S.M. (1982). On Asian ornithopods (Dinosauria: Ornithischia). 2. ''Arstanaosaurus akkurganensis'' Shilin and Suslov, 1982. ''Proceedings of Geologists' Association'' 108(3):191-199.〕 It was regarded as an indeterminate hadrosaurid in the most recent review.〔Horner, J.R., Weishampel, D.B., and Forster, C.A. (2004). Hadrosauridae. In: Weishampel, D.B., Dodson, P., and Osmólska, H. (eds.). ''The Dinosauria'' (second edition). University of California Press:Berkeley, 438-463. ISBN 0-520-06727-4.〕 A juvenile skeleton from Mongolia has been attributed to ''Arstanosaurus'', but on what grounds is unknown. It is under study.〔Norman, D.B., and Sues, H.-D. (2000). Ornithopods from Kazakhstan, Mongolia and Siberia. In: Benton, M.J., Shishkin, M.A., Unwin, D.M., and Kurochkin, E.N. (Eds.). ''The Age of Dinosaurs in Russia and Mongolia.'' Cambridge University Press:Cambridge, 462-479. ISBN 0-521-55476-4.〕 It was formerly called "Gadolosaurus". Diagnostic hadrosauroid remains from the same area have in 2012 been named as ''Batyrosaurus''.〔Pascal Godefroit, François Escuillié, Yuri L. Bolotsky & Pascaline Lauters, 2012, "A New Basal Hadrosauroid Dinosaur from the Upper Cretaceous of Kazakhstan". In: Godefroit, P. (eds). ''Bernissart Dinosaurs and Early Cretaceous Terrestrial Ecosystems''. Indiana University Press. pp. 335–362〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Arstanosaurus」の詳細全文を読む スポンサード リンク
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