Separating sexual dimorphism from other morphological variation in a specimen complex of fossil marine reptiles (Reptilia, Ichthyosauriformes, Chaohusaurus)

doi:10.1038/s41598-018-33302-4

	Separating sexual dimorphism from other morphological variation in a specimen complex of fossil marine reptiles (Reptilia, Ichthyosauriformes, Chaohusaurus)
	Motani, Ryosuke 1; Huang, Jiandong 2; Jiang, Da-Yong 3,4; Tintori, Andrea 5; Rieppel, Olivier 6; You, Hailu7 ; Hu, Yuan-Chao 2; Zhang, Rong 2
刊名	SCIENTIFIC REPORTS
	2018-10-08
卷号	8 页码:14
ISSN号	2045-2322
DOI	10.1038/s41598-018-33302-4
通讯作者	Motani, Ryosuke(rmotani@ucdavis.edu) ; Huang, Jiandong(jiandongh2008@163.com)
英文摘要	The Early Triassic Chaohu Fauna from Anhui Province, China, contains the oldest record of Mesozoic marine reptiles, such as Cartorhynchus and Sclerocormus. Most specimens from the fauna belong to the ichthyosauriform Chaohusaurus, more specifically resembling C. chaoxianensis. However, a wide range of morphological variation exists within about 40 skeletons that have been prepared, likely reflecting mixed signals from both sexual and taxonomic differences. We test whether the sexual and taxonomic signals are separable based on quantification, aided by the knowledge of sexual dimorphism in extant marine tetrapods. There are two different suites of dimorphism that divide the specimens differently from each other yet consistently within each suite, resulting in four morphotypes in combination, likely representing two sexes of two taxa. Presumed males have larger 'organ of prehension' sensu Darwin, specifically limbs in the present case, for a given body length. This sexing criterion is supported by the only specimen of a gravid female, which belongs to the morphotype with short limbs. Males also have larger skulls for the trunk length compared to females. This study demonstrates that sexual and taxonomic signals are separable in fossil reptiles, with a sufficient sample size and careful analyses.
资助项目	Ministry of Land and Resources of China[201511054] ; Department of Land and Resources of Anhui Province[2016-k-5] ; National Natural Science Foundation of China[41402005] ; National Natural Science Foundation of China[41372016] ; National Natural Science Foundation of China[40920124002] ; Ministry of Science and Technology of China[2016YFC0503301]
WOS关键词	BOTTLE-NOSED DOLPHINS ; GEOGRAPHIC-VARIATION ; FRANCISCANA DOLPHIN ; EXTERNAL MORPHOLOGY ; TURSIOPS-TRUNCATUS ; SEA-SNAKE ; SELECTION ; GROWTH ; BIOLOGY ; FLORIDA
WOS研究方向	Science & Technology - Other Topics
语种	英语
出版者	NATURE PUBLISHING GROUP
WOS记录号	WOS:000446577500055
资助机构	Ministry of Land and Resources of China ; Department of Land and Resources of Anhui Province ; National Natural Science Foundation of China ; Ministry of Science and Technology of China
内容类型	期刊论文
源URL	[http://119.78.100.205/handle/311034/9004]
专题	中国科学院古脊椎动物与古人类研究所
通讯作者	Motani, Ryosuke; Huang, Jiandong
作者单位	1.Univ Calif Davis, Dept Earth & Planetary Sci, Davis, CA 95616 USA 2.Anhui Geol Museum, Dept Res, Jiahe Rd 999, Hefei 230031, Anhui, Peoples R China 3.Peking Univ, Dept Geol, Minist Educ, Lab Orogen Belt & Crustal Evolut, Beijing 100871, Peoples R China 4.Peking Univ, Geol Museum, Beijing 100871, Peoples R China 5.Univ Milan, Dipartimento Sci Terra, Via Mangiagalli 34, I-20133 Milan, Italy 6.Field Museum, Integrat Res Ctr, Chicago, IL 60605 USA 7.Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, 142 Xizhimenwai St, Beijing 100044, Peoples R China
推荐引用方式 GB/T 7714	Motani, Ryosuke,Huang, Jiandong,Jiang, Da-Yong,et al. Separating sexual dimorphism from other morphological variation in a specimen complex of fossil marine reptiles (Reptilia, Ichthyosauriformes, Chaohusaurus)[J]. SCIENTIFIC REPORTS,2018,8:14.
APA	Motani, Ryosuke.,Huang, Jiandong.,Jiang, Da-Yong.,Tintori, Andrea.,Rieppel, Olivier.,...&Zhang, Rong.(2018).Separating sexual dimorphism from other morphological variation in a specimen complex of fossil marine reptiles (Reptilia, Ichthyosauriformes, Chaohusaurus).SCIENTIFIC REPORTS,8,14.
MLA	Motani, Ryosuke,et al."Separating sexual dimorphism from other morphological variation in a specimen complex of fossil marine reptiles (Reptilia, Ichthyosauriformes, Chaohusaurus)".SCIENTIFIC REPORTS 8(2018):14.