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Mandschurosaurus
''Mandschurosaurus'' is a genus of hadrosaurs based on material from the Upper Cretaceous of Belye Kruchi, Manchuria. ''M. amurensis'' is based on a poorly preserved and incomplete skeleton collected by Russian scientists in 1914 from the banks of the Amur River. It was the first dinosaur genus named from China, and a mounted skeleton is on display at the Central Geological and Prospecting Museum in St. Petersburg. However, much of the skeleton is plaster. Regardless, the remains represent a large hadrosaurid. There has been some debate regarding the validity of this genus. Brett-Surman (1979) first considered it a ''nomen dubium'', though some later workers have continued to see it as a valid taxon (Chapman et Brett Surman, 1990, for example). Most recently, Horner et al. (2004) listed the type species as a ''nomen dubium''. The holotype material was initially referred to the genus ''"Trachodon"'' (also a ''nomen dubium''), but later reassigned to a new genus by Riabinin (1930).
Over the years, three species have been placed within this genus: ''Mandschurosaurus amurensis'', ''M. mongoliensis'', and ''M. laosensis''. Brett-Surman (1979) considered ''M. mongoliensis'' a distinct genus, which he named ''Gilmoreosaurus''. Horner ''et al.'' (2004) considered ''M. laosensis'' a ''nomen dubium''. This leaves only Riabinin's original species, ''M. amurensis'', as a possibly valid taxon.
==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）』
■ウィキペディアで「Mandschurosaurus」の詳細全文を読む
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