A re-evaluation of Chinshakiangosaurus chunghoensis Ye vide Dong 1992 (Dinosauria, Sauropodomorpha): implications for cranial evolution in basal sauropod dinosaurs

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	A re-evaluation of Chinshakiangosaurus chunghoensis Ye vide Dong 1992 (Dinosauria, Sauropodomorpha): implications for cranial evolution in basal sauropod dinosaurs
	Upchurch, Paul; Barrett, Paul M.; Zhao Xijin; Xu Xing; Upchurch, P (reprint author), UCL, Dept Earth Sci, Gower St, London WC1E 6BT, England.
	2007
发表期刊	GEOLOGICAL MAGAZINE
ISSN	0016-7568
卷号	144 期号:2 页码:247—262
摘要	Re-description of the left dentary of Chinshakiangosaurus chunghoensis reveals that it possesses an unusual combination of 'prosauropod' and 'sauropod' character states. Cladistic analysis places Chinshakiangosaurus as one of the most basal sauropods known currently. Mapping of dentary and dental characters onto the most parsimonious topologies yields insights into the sequence of acquisition of a number of feeding-related characters. For example, it seems that basal sauropodomorphs (traditional prosauropod taxa) possessed a fleshy cheek that attached to the mandible along a marked ridge, and that the same structure was present in the most basal sauropods. The early sauropod skull developed a lateral plate that reinforced the bases of the tooth crowns labially, and had wrinkled tooth enamel and a concavity on the mesial portion of the lingual part of each crown, while retaining a fleshy cheek and a relatively weak symphysis. More advanced sauropods (eusauropods) lost the cheek, perhaps in order to increase the gape of the jaws in response to a change in feeding style that involved collection of larger quantities of poor quality foliage.
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文献类型	期刊论文
条目标识符	http://119.78.100.205/handle/311034/3379
专题	中科院古脊椎所（2000年以后）古低等脊椎动物研究室
通讯作者	Upchurch, P (reprint author), UCL, Dept Earth Sci, Gower St, London WC1E 6BT, England.
推荐引用方式 GB/T 7714	Upchurch, Paul,Barrett, Paul M.,Zhao Xijin,et al. A re-evaluation of Chinshakiangosaurus chunghoensis Ye vide Dong 1992 (Dinosauria, Sauropodomorpha): implications for cranial evolution in basal sauropod dinosaurs[J]. GEOLOGICAL MAGAZINE,2007,144(2):247—262.
APA	Upchurch, Paul,Barrett, Paul M.,Zhao Xijin,Xu Xing,&Upchurch, P .(2007).A re-evaluation of Chinshakiangosaurus chunghoensis Ye vide Dong 1992 (Dinosauria, Sauropodomorpha): implications for cranial evolution in basal sauropod dinosaurs.GEOLOGICAL MAGAZINE,144(2),247—262.
MLA	Upchurch, Paul,et al."A re-evaluation of Chinshakiangosaurus chunghoensis Ye vide Dong 1992 (Dinosauria, Sauropodomorpha): implications for cranial evolution in basal sauropod dinosaurs".GEOLOGICAL MAGAZINE 144.2(2007):247—262.

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