Edmontosaurus kuukpikensis: Difference between revisions
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'''''Ugrunaaluk''''' is a genus of [[Saurolophinae|saurolophine]] [[Hadrosauridae|hadrosaurid]] which was found in the [[Arctic]] of [[Alaska]]. It contains the species ''''' |
'''''Ugrunaaluk''''' is a genus of [[Saurolophinae|saurolophine]] [[Hadrosauridae|hadrosaurid]] which was found in the [[Arctic]] of [[Alaska]]. It contains the species '''''Ugrunaaluk kuukpikensis'''''.<ref>{{cite web|last1=Joling|first1=Dan|title=Fossils of new duck-billed, plant-eating dinosaur species found in Alaska, researchers say|url=http://www.usnews.com/news/science/news/articles/2015/09/22/researchers-say-new-dinosaur-found-in-northern-alaska|publisher=Associated Press via US News|accessdate=23 September 2015}}</ref><ref>{{cite web|last1=Casey|first1=Michael|title=New dinosaur species may have left tracks in the snow|url=http://www.cbsnews.com/news/new-dinosaur-species-may-have-left-tracks-in-the-snow/|publisher=CBS News|accessdate=23 September 2015}}</ref> Its name is derived from [[Inupiat language|Inupiat]], meaning 'ancient grazer'. |
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From the 1980s onwards, in Alaska over 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]].<ref>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</ref> Later they were referred to ''[[Edmontosaurus]]'', more specifically ''Edmontosaurus regalis'', a member of the [[Saurolophinae]].<ref>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</ref> 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 class]]es 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.<ref>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</ref> |
From the 1980s onwards, in Alaska over 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]].<ref>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</ref> Later they were referred to ''[[Edmontosaurus]]'', more specifically ''Edmontosaurus regalis'', a member of the [[Saurolophinae]].<ref>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</ref> 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 class]]es 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.<ref>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</ref> |
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Revision as of 05:58, 24 September 2015
| Ugrunaaluk Temporal range: Late Cretaceous,
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| Reconstructed skull of juvenile Ugrunaaluk | |
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| Genus: | †Ugrunaaluk Mori et al., 2015
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| †Ugrunaaluk kuukpikensis Mori et al., 2015
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Ugrunaaluk is a genus of saurolophine hadrosaurid which was found in the Arctic of Alaska. It contains the species Ugrunaaluk kuukpikensis.[1][2] Its name is derived from Inupiat, meaning 'ancient grazer'.
From the 1980s onwards, in Alaska over 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.[3] Later they were referred to Edmontosaurus, more specifically Edmontosaurus regalis, a member of the Saurolophinae.[4] 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.[5]
The discovery of the new genus was published on 22 September 2015 by Hirotsugu Mori, Patrick Druckenmiller and Gregory Erickson.[6]
References
- ^ Joling, Dan. "Fossils of new duck-billed, plant-eating dinosaur species found in Alaska, researchers say". Associated Press via US News. Retrieved 23 September 2015.
- ^ Casey, Michael. "New dinosaur species may have left tracks in the snow". CBS News. Retrieved 23 September 2015.
- ^ 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
- ^ 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
- ^ 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
- ^ Hirotsugu Mori, Patrick S. Druckenmiller and Gregory M. Erickson (2015). "A new Arctic hadrosaurid from the Prince Creek Formation (lower Maastrichtian) of northern Alaska". Acta Palaeontologica Polonica (In press). doi:10.4202/app.00152.2015.