Mid-Cretaceous fish assemblages in north-eastern Mexico: A case-study for the actinopterygian diversification and global palaeobiogeography

在我们以前对墨西哥东北部白垩纪脊椎动物的研究工作中（DFG FR 1314/4-1，6-1，7-1，9-1，STI 128/9-1，9-2，VW I/78866），我们发现了几个地方产生了许多保存完好的鱼类。其中之一是在新莱昂的瓦勒西约发现的早期图伦鱼类组合，它提供了各种鲨鱼和放线鳍类的完整但破碎的标本。关于Vallecillo鱼类组合的初步报告已经发表，但对该组合的全球天气学研究仍有待进行。最近，新的注意力集中在科阿韦拉州东北部Muzquiz北部出露的上Turonian -Coniacian层状泥灰岩。在这个地区，小型商业采石场出产化石，这些化石保存得非常好。目前，科学界尚不清楚其地点和组合。我们在穆兹奎兹进行的初步调查发现，几种鱼类（卷须鱼、全骨鱼和硬骨鱼）甚至保存了精致的肌肉纤维和鳃丝，以及胃内容物，有时是三维的。这两个地方，特别是Muzquiz，有很大的潜力进行彻底的解剖描述的类群，并制定了时间周转内的继承offish组合对同时代的变化的古环境。本项目的主要目标是：1）了解白垩纪中期墨西哥鱼类组合与邻近地区（中特提斯，南大西洋，西内海和太平洋）的古地理联系。2)基于现有的关于鱼类多样化因果关系的假设，测试白垩纪中期全球辐射的情况。

During our previous research work on Cretaceous vertebrates from NE Mexico (DFG FR 1314/4-1, 6-1, 7-1, 9-1, STI 128/9-1, 9-2, VW I/78866) we discovered several localities yielding numerous well-preserved fishes. One of these is the early Turonian fish assemblage at Vallecillo, Nuevo Leon, which yields complete but crushed specimens of various sharks and actinopterygian taxa. Preliminary accounts have already been published about the Vallecillo fish assemblage, but a synoptic global study of this assemblage is still pending. Recently, new attention has been paid to the Upper Turonian -Coniacian laminated marly limestones exposed north of Muzquiz in the northeastern state of Coahuila. In this area, small commercial quarries yield fossils, which are exceptionally well preserved. At present, localities and assemblages are unknown to the scientific community. Our initial survey at Muzquiz resulted in several species of fishes (selacheans, holosteans and teleosts) in which even delicate muscle fibres and gill filaments, as well as fossilised stomach contents are preserved, sometimes in three dimensions. Both localities, and especially Muzquiz, bear great potential to carry out thorough anatomical description of the taxa and to draw up the temporal turnover within the succession offish assemblages against coeval changes of the palaeoenvironment. The principal objectives of the present project are: 1) Understanding the palaebiogeographical links of the mid-Cretaceous Mexican fish assemblages with the adjacent realms (Central Tethys, South Atlantic, Western Interior Sea and Pacific). 2) Testing the scenario of a mid-Cretaceous actinopterygian worldwide radiation based on existing hypotheses about causality offish diversification.