摘要
本文首次报导和系统描述了在云南罗平中三叠统关岭组上部发现的混鱼龙Mixosaurus kuhnschnyderi Brinkmann,1998,并与国内外同期地层中已知的混鱼龙种进行了对比。此外,还简单介绍了发现此化石的生物学、地层学和生物古地理分区的意义。
Many well-preserved marine reptiles and fish fossils were recently found from the Middle Triassic Guanling Formation at Dawazi, Jiuguang, Daming and Abang of Luoke Village, Luoping County of Yunnan Province. The fossil-bearing bed is distributed in the upper part of Guangling Formation, 25-35m below the basal of overlying Yangliujing Formation, and composed of dark thin-bedded limestone with very thin-bedded shale interbeds. Primary study indicated that the assemblages of marine reptiles and age of fossi-bearing bed were similar with those found from the Yangjian, Xiangshui Village of Xinming, Panxian County, Guizhou Province. The marine reptiles mainly included ichthyosaur, eosaurepterygia, nothosaur, placodont and protosaur. In this paper a skeleton of Mixosaurid from Luoke village is first recorded and systematic described as following.Superorder Ichthyopterygia Owen, 1840 Order Ichthyosauria Blainville, 1835 Suborder Mixosauria Montani, 1999B Family Mixosauridae Baur, 1887A Genus Mixosaurus Bars, 1887AMixosaurus kuhnschnyderi Brinkmann, 19981998a Sangiorgiosaurus kuhnschnyderi n. g. n. sp. ; Brinkmann, 132. 1998b Mixosaurus kuhnschnyderi （Brinkmann） ; pp. 167-170. 1999b Mixosaurus kuhnschnyderi （Brinkmann） ; Montani, 480. 2003 Mixosaurus kuhnschnyderi （Brinkmann） ; Montani, 69 Material. YIGM SPCV 0810, in right view, in the Museum of Yichang Institute of Geology and Mineral resources, is composed of well-preserved skull, pectoral girdle, forefin and most of body. Diagnosis （revised） ： Small Mixosaurus, probably not exceeding lm; tooth size of upper jaw larger than the overbiting at the lower jaw; the most posterior tooth in upper jaw being robust with bluntly pointed, conical crown; a conical tooth being between two mound shaped teeth in the most posterior 3 teeth of mandible. Locality and horizon： Luoke of Xinzhai Village, Luoping County, Yunnan Province; Upper part of Guanling Formation, Middle Triassic.
出处
《地质学报》
EI
CAS
CSCD
北大核心
2009年第9期1214-1220,共7页
Acta Geologica Sinica
基金
地质调查项目(编号1212010611603)资助的成果
关键词
海生爬行动物
混鱼龙
中三叠统
关岭组
云南罗平
Marine reptile
Mixosaurid
Middle Triassic
Guanling Formation
Luoping, Yunnan Province
