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首页> 外文期刊>Neues Jahrbuch fur Geologie und Palaontologie. Abhandlungen >New data on the palaeobiogeography of Early Jurassic marine reptiles: the Toarcian ichthyosaur fauna of the Vocontian Basin (SE France)
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New data on the palaeobiogeography of Early Jurassic marine reptiles: the Toarcian ichthyosaur fauna of the Vocontian Basin (SE France)

机译：侏罗纪早期海洋爬行动物古生物地理学的新数据：Vocontian盆地的Toarcian鱼龙类动物区系（法国东南部）

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摘要

The Vocontian Basin (SE France) was formed along the northwestern border of Teth-ys during Mesozoic times. Mainly known for its rich ammonite fauna, this basin has also yielded several Lower Jurassic ichthyosaurs. The specimens discussed here were discovered in lower Toar-cian limestone and marl successions in the vicinity of Digne-les-Bains, High-Provence Alps. The best-preserved specimen is identified as Suevoleviathan sp., a rare taxon previously reported only in southern Germany. Along with this specimen, premaxillae and paddle elements of Eurhinosaurus sp. and probable Stenopterygiidae centra were found in neighbouring localities. These specimens were preserved thanks to the deposition of soft anoxic marls or calcarodetritic sediments, coeval with other anoxic shales in Europe (the Toarcian Oceanic Anoxic Event or T-OAE), which allows faunal com-parisons between these basins. The localities from the Vocontian Basin are closer to the Tethys than any other sites where identifiable Toarcian ichthyosaurs have been found in Europe. Nevertheless, the Vocontian ichthyosaur assemblage is strikingly similar to those of other basins across Europe. This suggests a wide palaeobiogeographical distribution for Toarcian ichthyosaurs, reflecting their anatomical adaptations as highly mobile swimmers.
机译：Vocontian盆地（法国东南部）是在中生代沿泰特斯山脉西北边界形成的。该盆地主要以其丰富的am石动物群而闻名，还产生了数种下侏罗纪鱼龙。此处讨论的标本是在高普罗旺斯阿尔卑斯山迪格莱班附近的Toar-ian灰岩和泥灰岩演替层中发现的。保存最完好的标本为Suevoleviathan sp。，这是以前仅在德国南部报道过的罕见分类群。连同该标本一起，Eurhinosaurus sp。的前上颌和桨状元件。在附近地区发现了可能的斑节菌科。这些标本的保存归功于软质缺氧泥灰岩或钙合沉积物的沉积，与欧洲其他缺氧页岩（Toarcian Oceanic Anoxic Event或T-OAE）同时存在，这使得这些盆地之间能够进行动物区系比较。 Vocontian盆地的地理位置比在欧洲发现可辨认的Toarcian鱼龙的任何其他地点都更靠近特提斯。然而，沃孔奇鱼龙类群与欧洲其他盆地的群极为相似。这表明，Toarcian鱼龙的古生物地理分布较广，反映了其作为高机动游泳者的解剖适应性。

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