A New Triassic Primitive Ichthyosaur from Yuanan, South China

doi:10.1111/1755-6724.12078

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	A New Triassic Primitive Ichthyosaur from Yuanan, South China
	Chen Xiaohong 3; Sander, P. Martin ; Cheng Long ; Wang Xiaofeng
刊名	ACTA GEOLOGICA SINICA-ENGLISH EDITION
	2013
卷号	87 期号:3 页码:672-677
关键词	vertebrate paleontology reptilian ichthyosauria Lower Triassic (Spathian) Hubei Province
ISSN号	1000-9515
DOI	10.1111/1755-6724.12078
英文摘要	Based on the systematic study of two fossil skeleton specimens collected from the top of the third member of the marine Lower Triassic Jialingjiang Formation of Yuanan, Hubei Province, South China, a new Early Triassic primitive ichthyosaur Chaohusaurus zhangjiawanensis sp. nov. is reported and described. The beds yielding the type material are correlated with the Neospathodus homeri-N. triangularis Conodont zone. The new taxon is most similar to Chaohusaurus geishanensis Young and Dong, 1972 in the shape and configuration of the scapula, forefin, pelvic girdle and hindfin, presacral vertebral count and well-developed caudal peak, but distinguished from the latter by its larger size, the position of the pineal foramen in the centre of the parietal, the occurrence of a larger calcaneum in hindfin and the first sacral rib with distal expansion. The new species exhibits common features of primitive ichthyosaurs such as: (1) the prefrontal has an antero-dorsal shelf projecting towards the orbit; (2) the upper temporal fenestra is small; (3) the postorbital and the squamosal meet laterally to the upper temporal fenestra; and (4) cylindrical centra. However, more derived ichthyosaur characters are seen with the frontal separated from the orbital dorsal margin by the contact of the prefrontal and postfrontal, which offer new clues to the early radiation of ichthyosaurs.
学科主题	古生物学
WOS关键词	REPTILIA ; ICHTHYOPTERYGIA ; PROVINCE
WOS研究方向	Geology
语种	英语
出版者	WILEY-BLACKWELL
WOS记录号	WOS:000321845300004
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39919]
专题	中国地质调查局武汉地质调查中心
作者单位	1.Wuhan Ctr China Geol Survey, Wuhan 430223, Peoples R China. 2.Univ Bonn, Steinmann Inst Geol Mineral & Palaontol, D-53115 Bonn, Germany. 3.中国地质调查局武汉地质调查中心
推荐引用方式 GB/T 7714	Chen Xiaohong,Sander, P. Martin,Cheng Long,et al. A New Triassic Primitive Ichthyosaur from Yuanan, South China[J]. ACTA GEOLOGICA SINICA-ENGLISH EDITION,2013,87(3):672-677.
APA	Chen Xiaohong,Sander, P. Martin,Cheng Long,&Wang Xiaofeng.(2013).A New Triassic Primitive Ichthyosaur from Yuanan, South China.ACTA GEOLOGICA SINICA-ENGLISH EDITION,87(3),672-677.
MLA	Chen Xiaohong,et al."A New Triassic Primitive Ichthyosaur from Yuanan, South China".ACTA GEOLOGICA SINICA-ENGLISH EDITION 87.3(2013):672-677.