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Mamenchisauridae
Mamenchisauridae is a family of sauropod dinosaurs. The family was first named by Chinese paleontologists C.C. Young and X. Zhao in 1972, in a paper describing ''Mamenchisaurus''.〔Young, C.C. and Zhao, X. (1972). "''Mamenchisaurus hochuanensis sp. nov.''". ''Institute of Vertebrate Palaeontology and Palaeoanthropology Monographs'' Series A 8: 1-30.〕 Other mamenchisaurids may include ''Chuanjiesaurus'', ''Eomamenchisaurus'', ''Hudiesaurus'', ''Tienshanosaurus'', ''Omeisaurus'', and ''Tonganosaurus''. Fossils of ''Mamenchisaurus'' and ''Omeisaurus'' have been found in the Shangshaximiao Formation, dating to the Oxfordian stage, around 161.2-155.7 Ma (million years ago). ''Chuanjiesaurus'' fossils date between 175.6-161.2 Ma, while those of ''Eomamenchisaurus'' were found in the Zhanghe Formation, believed to be around 175.6-161.2 million years old.〔Lü, J., Li, T., Zhong, S., Ji, Q., and Li, S. (2008). "A new mamenchisaurid dinosaur from the Middle Jurassic of Yuanmou, Yunnan Province, China". ''Acta Geologica Sinica'' 82(1) :17-26.〕 Fossils of ''Tonganosaurus'' date to even earlier, from the Early Jurassic.〔Li, K., Yang, C.-Y., Liu, J. and Wang, Z.-X. (2010). "A new sauropod dinosaur from the Lower Jyrassic of Huili, Sichuan, China." ''Vertebrata Palasiatica'', (3).〕
Long-bone histology enables researchers to estimate the age that a specific individual reached. A study by Griebeler et al. (2013) examined long bone histological data and concluded that the unnamed mamenchisaurid SGP 2006/9 weighed , reached sexual maturity at 20 years and died at age 31.〔Griebeler EM, Klein N, Sander PM (2013) Aging, Maturation and Growth of Sauropodomorph Dinosaurs as Deduced from Growth Curves Using Long Bone Histological Data: An Assessment of Methodological Constraints and Solutions. PLoS ONE 8(6): e67012. doi:10.1371/journal.pone.0067012〕
==References==
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「Mamenchisauridae」の詳細全文を読む
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