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Arkharavia
''Arkharavia'' is a dubious genus of somphospondylan sauropod, but at least some of the remains probably belong to a hadrosaurid.〔P. D. Mannion, P. Upchurch, R. N. Barnes and O. Mateus. (2013). ("Osteology of the Late Jurassic Portuguese sauropod dinosaur Lusotitan atalaiensis (Macronaria) and the evolutionary history of basal titanosauriforms." ) ''Zoological Journal of the Linnean Society'' 168: 98-206.〕 It lived in what is now Russia, during the Late Cretaceous. It was described in 2010 by Alifanov and Bolotsky. The type species is ''A. heterocoelica''.
==Description==
The holotype material consists of a single anterior caudal vertebra. Also, a tooth and a few proximal tail vertebrae (from near the base of the tail) were originally described as belonging to this species, but these probably belong to an indeterminate hadrosaur.〔〔Godefroit, P., Bolotsky, Y.L. and Bolotsky, I.Y. (2011). "Osteology and relationships of ''Olorotitan arharensis'', a hollowcrested hadrosaurid dinosaur from the latest Cretaceous of Far Eastern Russia." ''Acta Palaeontologica Polonica'', (advance online publication) 〕 The vertebrae are unusual in being weakly heterocoelous, which means that the centrum or body of a vertebra has saddle-shaped surfaces where it meets the vertebrae in front or behind it.
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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