贵州晚三叠世卡尼期周氏黔鱼龙(Qianichthyosaurus zhoui)性双形研究  

Sexual Dimorphism Study of Qianichthyosaurus Zhoui in the Late Triassic Carnian Eag,Guizhou

作　　者：何犇 马知恒 付丽红 HE Ben;MA Zhi-heng;FU Li-hong(Guizhou Geological Survey,Guiyang 550081,Guizhou,China;School of Geoscience and Technology,Southwest Petroleum University,Chengdu 610500,Sichuan,China;Jianmenguan Overseas Chinese Town Tourism Development Co.Ltd,Guangyuan 628000,Sichuan,China;􀆰Innovation Center of Ore Resources Exploration Technology in the Region of Bedrock,Ministry of Natural Resources of People’s Republic of China,Guiyang 550081,Guizhou,China)

机构地区：[1]贵州省地质调查院,贵州贵阳550081 [2]西南石油大学地球科学与技术学院,四川成都610500 [3]剑门关华侨城旅游开发股份有限公司,四川广元628000 [4]自然资源部基岩区矿产资源勘查工程技术创新中心,贵州贵阳550081

出　　处：《贵州地质》2023年第3期249-258,320,共11页Guizhou Geology

基　　金：国家自然基金项目(编号:41972120,42172129);现代古生物与地层学国家重点实验室开放基金(编号:173131);贵州省科技厅科技支撑计划项目(编号:黔科合支撑[2022]一般257)联合资助。

摘　　要：本文对产于贵州兴义乌沙地区上三叠统卡尼阶法郎组瓦窑段中的17件鱼龙标本进行研究,认为本次研究标本均为Qianichthyosaurus zhoui。通过对其肢骨的定性及定量分析认为,Qianichthyosaurus zhoui在后肢形态上存在性双形现象。暨雄性后肢外形窄长,雌性后肢则相对宽短;雄性的股骨比肱骨长度略长,而雌性的股骨与肱骨长度相当;雄性股骨近端和远端相较于雌性更为膨大股骨远端宽度为中轴宽度的2.53倍,股骨长与股骨中轴的比值较大,通常大于3.5;雌性股骨近端和远端相较于雄性较小股骨远端宽度一般为中轴宽度的2倍左右,股骨长与股骨中轴的比例较小,比值约为3左右雌性第一跖骨面积较小且具有凹缺,雄性第一跖骨面积较大不具凹缺。In this paper,we studied 17 ichthyosaur specimens from the Wayao Member of the Upper Triassic Carnian Falang Formation in the Wusha area of Xingyi,Guizhou.All specimens examined belonged to Qianich-thyosaurus zhoui􀆰Through qualitative and quantitative analysis of the limb bones,it was observed that Qianichthyosaurus zhoui exhibited dimorphism in hind limb morphology􀆰Specifically,male hind legs were char-acterized by a narrow and elongated structure,while female hind legs were relatively wider and shorter􀆰Additionally,male femurs were slightly longer than humeri,whereas female femurs had similar lengths to humeri􀆰Furthermore,compared to females,males displayed more pronounced enlargement in both distal and proximal femurs􀆰The distal width of the femur was approximately 2.5-3 times that of its middle axis with a lar-ger ratio of length to middle axis(usually exceeding 3.5)􀆰On the other hand,males exhibited smaller proximal and distal femurs with a distal width roughly twice that of their middle axis and a lower ratio of length to middle axis(around 3)􀆰Notably,females possessed a smaller first metatarsal bone area with a concave defect present,however,males showcased a larger first metatarsal bone area without any concave defect.

关 键 词：Qianichthyosaurus zhoui 性双形 卡尼阶 贵州兴义 

分 类 号：P534.51[天文地球—古生物学与地层学] Q91[天文地球—地质学]