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Ugrunaaluk
''Ugrunaaluk'' is a genus of saurolophine hadrosaurid which was found in the Arctic of Alaska. It contains the species ''Ugrunaaluk kuukpikensis''. Its name is derived from Inupiat, meaning 'ancient grazer'.
From the 1980s onwards, in Alaska more than six thousand bones of hadrosaurid dinosaurs have been uncovered, at the Colville River. They were found north of Umiat in the Liscomb bonebed. At first they were identified as belonging to some member of the Lambeosaurinae.〔Brouwers, E.M., Clemens, W.A., Spicer, R.A., Ager, T.A., Carter, L.D., and Sliter, W.V., 1987, "Dinosaurs on the North Slope, Alaska: High latitude, latest Cretaceous environments". ''Science'' 237: 1608–1610〕 Later, they were referred to ''Edmontosaurus'', more specifically ''Edmontosaurus regalis'', a member of the Saurolophinae.〔Xing, H., Zhao, X., Wang, K. Li, D., Chen, S., Jordan, C.M., Zhang, Y and Xu, X., 2014, "Comparative Osteology and Phylogenetic Relationship of ''Edmontosaurus'' and ''Shantungosaurus'' (Dinosauria: Hadrosauridae) from the Upper Cretaceous of North America and East Asia", ''Acta Geologica Sinica'' 88: 1623–1652〕 A definite identification was hampered by the fact that most of the bones were of juveniles. In 2014, Hirotsugu Mori solved this problem by statistically determining size classes within the fossil material and comparing the Alaskan bones with known ''Edmontosaurus annectens'' specimens of the same size. He concluded that they represented two separate species.〔Mori, H., 2014, ''Osteology, Relationships And Paleoecology Of a New Arctic Hadrosaurid (Dinosauria: Ornithopoda) From the Prince Creek Formation Of Northern Alaska''. Unpublished Ph.D. thesis, University of Alaska Fairbanks, Fairbanks 333 pp〕
The discovery of the new genus was published on 22 September 2015 by Hirotsugu Mori, Patrick Druckenmiller and Gregory Erickson.
==References==
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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