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Wulagasaurus
''Wulagasaurus'' (meaning "Wulaga lizard", in reference to the discovery locality) is a genus of saurolophine (Classic hadrosaurinae hadrosaurid dinosaur from the Late Cretaceous of Heilongjiang, China. Its remains were found in a bonebed in the middle Maastrichtian-age Yuliangze Formation, dated to 69 million years ago.〔Godefroit, P., Lauters, P., Van Itterbeeck, J., Bolotsky, Y. and Bolotsky, I.Y. (2011). "Recent advances on study of hadrosaurid dinosaurs in Heilongjiang (Amur) River area between China and Russia." ''Global Geology'', 2011(3).〕 This bonebed is otherwise dominated by fossils of the lambeosaurine hadrosaurid (hollow-crested duckbill) ''Sahaliyania''. ''Wulagasaurus'' was named by Pascal Godefroit and colleagues in 2008. Only partial remains are known at this time. It is one of several hadrosaurids from the Amur River region named since 2000. The type and only species to date is ''W. dongi'', named in honor of Chinese paleontologist Dong Zhiming.
''Wulagasaurus'' is based on GMH W184, a partial dentary (toothbearing bone of the lower jaw). Godefroit and colleagues assigned additional remains from the bonebed to their new genus, including three braincases, a cheekbone, two maxillae (the toothbearing bone of the upper jaw), another dentary, two shoulder blades, two sternal elements, two upper arm bones, and an ischium. It can be distinguished from other hadrosaurids by its slender dentary and the unique form of its upper arm, which had distinctive articulations and placements for muscle attachments. Godefroit and colleagues performed a phylogenetic analysis that suggests ''Wulagasaurus'' was the most basal saurolophine known (Which would result in a long ghost lineage.〔http://scienceblogs.com/tetrapodzoology/2008/03/27/dinosaur-news-2008/〕), and interpreted this as evidence that saurolophines and hadrosaurids in general originated in Asia, which has been supported by other finds since.〔herbivore.
In recent studies conducted by researchers from the ''Institute of Vertebrate Paleontology and Paleoanthropology'' (IVPP), along with others from ''Chinese Academy of Science'', ''American Museum of Natural History'', and ''Geological Museum of Heilongjiang Provinces'', re-evaluated and re-described ''Wulagasaurus dongi''.〔 Based on both original and recent specimens, they concluded that ''Wulagasaurus'' shared many morphological similarities with North American taxon's ''Brachylophosaurus'' and ''Maiasaura'', possibly forming a clade-structure within the already existing clade Brachylophosaurini.〔 This hypothesis has been demonstrated by another phylogenetic analysis recently coming out.
==See also==
* Timeline of hadrosaur research
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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