贵州盘州中三叠世Mixosaurus panxianensis(盘县混鱼龙)前肢形态差异及种内变化探讨  

Morphological differences and intraspecific variations of the forefins of Mixosaurus panxianensis from the Middle Triassic of Panzhou, Guizhou

作　　者：周敏[1] 江大勇[1] Ryosuke Motani 鲁昊 ZHOU Min;JIANG Da-yong;MOTANI Ryosuke;LU Hao(Department of Geology and Geological Museum,Peking University,Beijing 100871,China;Department of Earth and Planetary Sciences,University of California Davis,Davis,CA 95616-8605,U.S.A;School of History,Peking Normal University,Beijing 100091,China)

机构地区：[1]北京大学地球与空间科学学院与地质博物馆,北京100871 [2]Department of Earth and Planetary Sciences,University of California Davis,Davis,CA 95616-8605,U.S.A [3]北京师范大学历史学院,北京100091

出　　处：《古生物学报》2022年第4期643-653,共11页Acta Palaeontologica Sinica

基　　金：国家自然科学基金(41372016,41402014,42172008,40920124002,41920104001);贵州省科技计划项目(黔科合[2016]支撑2904号);科技部项目(2016YFC0503301);中科院南京地质古生物研究所现代古生物学与地层学国家重点实验室开放基金(123107,143108);高校博士点基金(20120001110072);安徽省自然资源厅科技项目(2021-k-13);安徽省公益性地质工作项目(2021-g-2-16)联合资助。

摘　　要：混鱼龙科除Mixosaurus cornalianus之外的其他属种由于化石材料稀少、保存破碎,此前对其形态解剖学特征,特别是前肢形态结构特征及其生长发育过程和种内差异认识存在局限。经对发掘自贵州省盘州市(原为盘县)新民乡及邻区多件不同大小的Mixosaurus panxianensis标本前肢进行观察对比和定量研究,发现其尺骨、桡腕骨、指骨以及豌豆骨显示了一定的随生长发育而发生的特征变化。此外,桡骨前缘凹口和中间腕骨近端凹口的发育状态在M. cornalianus及M. panxianensis中均存在种内变异。The anatomy of the forefins of Mixosauridae, including ontogenetic and intraspecific variations, remains poorly known due to the lack of well-preserved materials except for Mixosaurus cornalianus. Several specimens of Mixosaurus panxianensis in different sizes excavated from Panzhou City, Guizhou Province were studied. The result shows some ontogenetic variations in their ulnae, radialia, phalanges and pisiforms. Moreover, the development of the notches on the anterior margin of radius and the proximal margin of intermedium is variable within individuals of Mixosaurus panxianensis.

关 键 词：混鱼龙 生长发育 中三叠世 贵州 盘州 

分 类 号：Q915[天文地球—古生物学与地层学]