三叠纪软骨硬鳞鱼类（龙鱼类和比耶鱼类）的形态学和系统学研究

项目名称： 三叠纪软骨硬鳞鱼类（龙鱼类和比耶鱼类）的形态学和系统学研究

项目编号： No.41472019

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 天文学、地球科学

项目作者： 吴飞翔

作者单位： 中国科学院古脊椎动物与古人类研究所

项目金额： 92万元

中文摘要： 龙鱼类和比耶鱼类与鲟形鱼类可能有着较近的亲缘类群，对软骨硬鳞鱼类的系统发育学和分类学研究有着重要意义。本项目拟对我国三叠纪地层中的龙鱼类和比耶鱼类新材料进行深入细致的形态解剖学工作，积累丰富的形态学信息；通过分支分析方法讨论龙鱼类和比耶鱼类内部及其与其他低等辐鳍鱼类的系统发育关系，重点探讨龙鱼类和比耶鱼类与鲟形鱼类之间的系统关系，完善和更新目前有关低等辐鳍鱼类包括软骨硬鳞鱼类系统发育关系的假说，明确软骨硬鳞鱼类的系统位置及其分类框架。此外，通过形态比较分析，总结龙鱼类和比耶鱼类的生态特点，重点关注龙鱼类的生态分异与种间生态关系，以增进对二叠纪末大灭绝之后海洋生态系统复苏和辐射过程的认识。

中文关键词： 三叠纪；龙鱼类；比耶鱼类；形态学；系统学

英文摘要： The project involves in comprehensive investigations of the morphology and systematics of two Triassic chondrostean lineages, saurichthyiform and birgeriiform fishes, which lie within the centre of the debates on the systematics and taxonomy of the Chondrostei. Based on numerous newly discovered fossil material, it intends to enrich the understanding of the morphology of the these groups. Upon detailed morphological investigations and comparison with the acipenseriform fishes, this project is set to include phylogenetic analyses which aim to resolve the intrarelationships of saurichthyiform and birgeriiform fishes, respectively, and also their systematic status within the lower actinopterygian phylogeny to test their possible affinities with the acipenseriform fishes. By analysing the ecologically relevant features, the project also aims to further study the ecology and adaptive diversification of the saurichthyiform and birgeriiform fishes (especially the former), thus shedding new light on our understanding of the Triassic biotic recovery and radiation in the marine realm after the end-Permian mass extinction.

英文关键词： Triassic;saurichthyiform;birgeriiform;morphology;systematics