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Adaptive radiation of the early evolution of ichthyosaurs

鱼龙早期进化的适应性辐射

基本信息

批准号：
09041168
负责人：
MANABE Makoto
金额：
$ 14.91万
依托单位：
National Science Museum
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A).
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09041168/
关键词：
ichthyosaurs adaptive radiation aquatic adaptation Triassic The Panthalassa sea 海棲適応

项目摘要

Work for the past three years has focused on the incredibly rich fossil faunas of marine reptiles in the Triassic rocks of northeastern British Columbia, Canada. This region has over 1200 m of continuous Triassic marine sedimentation, spanning the Early, Middle and Late Triassic. It is during the Triassic that tetrapods first returned to the sea and diversified in the marine realm. Consequently, it is a particularly important time interval in the study of marine reptiles. This study has involved the collection and preparation of new fossil material, and the comparative study of critical collections in other institutions. Our work was concentrated primarily in two horizons - the Lower and Middle Triassic Sulphur Mountain Formation at Wapiti Lake, and the Upper Triassic Pardonet Formation in the Pink Mountain area. The overall results of this grant have been extensive. Over 140 fossil vertebrate specimens were collected, which are being prepared and studied. One of these, a 23m ichthyosaur, is the largest marine reptile known in the fossil record. Two scientific papers on this work have already been published (Motani et al, 1998 ; Nicholls and Manabe, 1998). Two papers have been presented at professional meetings (Nicholls and Manabe, 1999a, 1999b). Five more scientific papers are in progress, and will result as study and preparation of the specimens proceeds.

过去三年的工作重点是加拿大不列颠哥伦比亚省东北部三叠纪岩石中极其丰富的海洋爬行动物化石动物群。本区连续三叠纪海相沉积超过1200米，横跨早、中、晚三叠世。正是在三叠纪，四足动物首次重返海洋，并在海洋领域实现了多样化。因此，在海洋爬行动物研究中，这是一个特别重要的时间间隔。这项研究涉及新化石材料的收集和准备，以及对其他机构关键收藏品的比较研究。我们的工作主要集中在两个层位--瓦皮提湖的下、中三叠统硫尔山组和粉红山地区的上三叠统帕多内特组。这笔赠款的总体结果是广泛的。收集了140多个脊椎动物化石标本，正在准备和研究中。其中一种是23米长的鱼龙，是化石记录中已知的最大的海洋爬行动物。关于这项工作的两篇科学论文已经发表(Motani等人，1998年；Nicholls和Manabe，1998年)。在专业会议上提交了两篇论文(Nicholls和Manabe，1999a，1999b)。另外五篇科学论文正在进行中，随着标本的研究和准备工作的进行，这些论文将会产生。