New information on sexual dimorphism and allometric growth in   Keichousaurus hui, a pachypleurosaur from the Middle Triassic of   Guizhou, South China

doi:10.4202/app.00006.2013

CORC > 北京大学 > 地球与空间科学学院

	New information on sexual dimorphism and allometric growth in Keichousaurus hui, a pachypleurosaur from the Middle Triassic of Guizhou, South China
	Xue, Yifan ; Jiang, Dayong ; Motani, Ryosuke ; Rieppel, Olivier ; Sun, Yuanlin ; Sun, Zuoyu ; Ji, Cheng ; Yang, Pengfei
刊名	ACTA PALAEONTOLOGICA POLONICA
	2015
关键词	Pachypleurosauria Sauropterygia Keichousaurus hui allometry sexual dimorphism Triassic China MARINE REPTILES LIFE-HISTORY SAUROPTERYGIA SIZE
DOI	10.4202/app.00006.2013
英文摘要	Keichousaurus hui is a small pachypleurosaur (Reptilia: Sauropterygia) from the Triassic of China. Many specimens of various growth stages are known, making them ideal for ontogenetic research. We report 22 new specimens from the Middle Triassic of Xingyi (Guizhou, south China), and combined their skeletal measurements with those from 85 published specimens to analyze the ontogenetic trajectory of sexual dimorphism. An Exploratory Factor Analysis suggests that the largest factors behind morphological disparity within the species are body size followed by gender. Sexual dimorphism is most clearly reflected in selected skeletal ratios that are more pronounced in males than in females. We found that the relative length of femur to body size was useful in gender identification, in addition to three ratios that are traditionally used, namely a distal expansion of the humerus relative to its shaft, humerus length relative to body size, and humerus length relative to femur length. Two distinctive patterns exist in allometric changes of these four ratios. The distal expansion of the humerus is exceptional in that it is equally pronounced in juvenile and adult males and therefore must have been fully established during embryonic growth. The other three features are not pronounced at birth size and subsequently become pronounced during postembryonic growth. However, males and females already show different growth trajectories at birth size even in these three. Therefore, the fate of sexually dimorphic features seems to have already been set during embryonic growth in K. hui.; National Natural Science Foundation of China [40920124002, 40672002]; State Key Laboratory of Palaeobiology and Stratigraphy (NIGP, CAS) [123102]; SCI(E); ARTICLE; xueyifan1992@sina.com; djiang@pku.edu.cn; rmotani@ucdavis.edu; orieppel@fieldmuseum.org; ylsun@pku.edu.cn; sunzuoyu@pku.edu.cn; jicheng04@126.com; 445872056@qq.com; 3; 681-687; 60
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/417609]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Xue, Yifan,Jiang, Dayong,Motani, Ryosuke,et al. New information on sexual dimorphism and allometric growth in Keichousaurus hui, a pachypleurosaur from the Middle Triassic of Guizhou, South China[J]. ACTA PALAEONTOLOGICA POLONICA,2015.
APA	Xue, Yifan.,Jiang, Dayong.,Motani, Ryosuke.,Rieppel, Olivier.,Sun, Yuanlin.,...&Yang, Pengfei.(2015).New information on sexual dimorphism and allometric growth in Keichousaurus hui, a pachypleurosaur from the Middle Triassic of Guizhou, South China.ACTA PALAEONTOLOGICA POLONICA.
MLA	Xue, Yifan,et al."New information on sexual dimorphism and allometric growth in Keichousaurus hui, a pachypleurosaur from the Middle Triassic of Guizhou, South China".ACTA PALAEONTOLOGICA POLONICA (2015).