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Huanghetitan liujiaxiaensis : ウィキペディア英語版
Huanghetitan

''Huanghetitan'' (meaning "Yellow River titan"), is a genus of sauropod dinosaur from the early Cretaceous Period. It was a basal titanosauriform which lived in what is now Gansu, China.
The type species, ''Huanghetitan liujiaxiaensis'', was described by You ''et al.'' in 2006. It is known from fragmentary materials including two caudal vertebrae, an almost complete sacrum, rib fragments, and the left shoulder girdle, and was discovered in the eastern part of the Lanzhou Basin (Hekou group) in the Gansu Province in 2004.〔You, H., Li, D., Zhou, L., and Ji, Q., (2006). "Huanghetitan liujiaxiaensis. a New Sauropod Dinosaur from the Lower Cretaceous Hekou Group of Lanzhou Basin, Gansu Province, China." ''Geological Review'', 52 (5): 668-674.〕
A second species, ''"H." ruyangensis'', was described in 2007 from the Mangchuan Formation of Ruyang County, China (Henan Province). A recent cladistic analysis has found that this species is not related to ''H. liujiaxiaensis'' and requires a new genus name.〔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 is known from a partial vertebral column and several ribs, the size of which (the largest approaches 3 m (10 ft)) indicate it had among the deepest body cavities of any known dinosaur.〔Lu J., Xu, L., Zhang, X., Hu, W., Wu, Y., Jia, S., and Ji, Q. (2007). "A new gigantic sauropod dinosaur with the deepest known body cavity from the Cretaceous of Asia." ''Acta Geologica Sinica'', 81: 167-176.〕 This second species, along with its local relatives ''Daxiatitan'' and ''Ruyangosaurus'', is one of the biggest dinosaurs ever found in Asia, and possibly one of the largest in the world.
In 2007, Lu ''et al.'' created a new family for ''Huanghetitan'', the Huangetitanidae, but this family found to be polyphyletic by Mannion ''et al.''〔〔
==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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