A Fish Assemblage from the Middle Eocene from Libya (Dur At-Talah) and the Earliest Record of Modern African Fish Genera
A Fish Assemblage from the Middle Eocene from Libya (Dur At-Talah) and the Earliest Record of Modern African Fish Genera
复制标题
利比亚中始新世鱼类组合（Dur At-Talah）和现代非洲鱼类属的最早记录
作者：
O. Otero;A. Pinton;H. Cappetta;S. Adnet;Xavier Valentin;M. Salem;J. Jaeger
在20世纪60年代初，Arambourg和Magnier发现了一些淡水鱼（即，Polypterus sp.，鲶形目和Lates sp.）在利比亚沙漠南部的Gebel Coquin，始新世脊椎动物组合中的海洋成员混合。这一地区的年龄约为37- 39 Ma，现在以Dur At-Talah的名字命名，最近被挖掘出来。使命团（Mission Franco-Eugene）收集到一种新的鱼类组合，主要由牙齿组成。在本文中，我们描述了淡水鱼类成员，包括一个dipnoan（Protopterus sp.），和几种放线菌：bichir（Polypterus sp.），阿坝鱼（Gymnarchus sp.），几种鲶鱼（鱼属和一种莫乔基德），几种characiforms（包括虎鱼Hydrocynus sp.，和一种或两种类似阿莱斯廷的鱼），以及鲈形目（包括蛇头鱼Parachanna sp.和至少一种慈鲷）。与埃及Birket Qarun的化石一起，利比亚的Dur At-Talah遗址减少了非洲淡水鱼化石记录中10 Ma的时间间隔。它们的鱼类组合在组成上重叠，因此构成了古近纪非洲鱼类区系中相当均一、原始和大量的新元素。这支持了现代非洲淡水鱼类动物群在这一时期的建立，因为这些地点大多包含现代属中已知的最早成员。
In the early nineteen sixties, Arambourg and Magnier found some freshwater fish (i.e., Polypterus sp., Siluriformes indet. and Lates sp.) mixed with marine members in an Eocene vertebrate assemblage at Gebel Coquin, in the southern Libyan Desert. This locality, aged ca 37–39Ma and now known under the name of Dur At-Talah, has been recently excavated. A new fish assemblage, mostly composed of teeth, was collected by the Mission Paléontologique Franco-Libyenne. In this paper, we describe freshwater fish members including a dipnoan (Protopterus sp.), and several actinopterygians: bichir (Polypterus sp.), aba fish (Gymnarchus sp.), several catfishes (Chrysichthys sp. and a mochokid indet.), several characiforms (including the tiger fish Hydrocynus sp., and one or two alestin-like fish), and perciforms (including the snake-head fish Parachanna sp. and at least one cichlid). Together with the fossiliferous outcrops at Birket Qarun in Egypt, the Libyan site at Dur At-Talah reduces a 10-Ma chronological gap in the fossil record of African freshwater fish. Their fish assemblages overlap in their composition and thus constitute a rather homogenous, original and significant amount of new elements regarding the Paleogene African ichthyofauna. This supports the establishment of the modern African freshwater fish fauna during this time period because these sites mostly contain the earliest members known in modern genera.