贵州普安中三叠统混鱼龙(鱼龙类:爬行动物)一新种

A NEW SPECIES OF MIXOSAURUS(REPTILIA:ICHTHYOSAURIA)FROM THE MIDDLE TRIASSIC OF PU'AN,GUIZHOU,CHINA

贵州普安青山至新店一带发育有与盘县新民羊件地区相似的中三叠统关岭组地层和海生爬行动物组合。基于贵州普安新店关岭组上部一件完整保存的混鱼龙骨架标本的修理和系统研究,识别并描述了一个混鱼龙的新种——新店混鱼龙(Mixosaurus xindianensis sp. nov.)。结合三叠纪已知鱼龙类化石属种性状的支序分析,比较和讨论了新种与其它已知混鱼龙属种的异同,指出新种兼具以往在欧洲圣乔治山和北美内华达地区中三叠世地层中发现的M.cornalianus和M.callawayi的特征。

The marine reptile assemblage in the Middle Triassic Guanling Formation of Qingshan-Xindian area,Pu＇an County,including Sauropterygia,Protosauria and Ichthyosauria,is very similar to that of the Panxian Fauna of Yangjian area,Pan-xian County,Guizhou Province.A well-preserved mixosaur specimen was collected from the Upper part of the Guanling Formation in Xindian town in recent field work.A new species Mixosaurus xindianensis sp.nov.was erected by detailed description.It is very important to the phylogeny of Mixosauria.The systematic paleontology and diagnosis are as following.