Elasmobranch remains are quite common in Miocene deposits and were the subject of numerous studies since the middle of the nineteenth century. Nevertheless, the taxonomic diversity of the Marine Molasse sharks, rays and skates is still largely unknown. Here, we describe 37 taxa from the lower Miocene of the Molasse Basin: 21 taxa could be identified at species level, whereas 15 taxa could only be assigned to genus and one taxon is left as order incertae sedis. The material was collected from deposits of the Auwiesholz Member of the Achen Formation (middle Burdigalian, middle Ottnangian age, ca. 17.8 Ma) exposed near Simssee, Upper Bavaria. This faunal assemblage is a mixture of shallow marine, near-coastal, pelagic and deep-water taxa. The fauna from Simssee displays different biogeographic dynamics at local and regional scales, possibly related to the intense climatic, oceanographic and tectonic events that occurred during the Eggenburgian–Ottnangian stages. The faunal relationships of the early Miocene chondrichthyan faunas from the Mediterranean Sea and Paratethys with others regions are established on the basis of qualitative (presence/absence) data. The beta diversity (Sørensen–Dice coefficient) of the Miocene Molasse elasmobranchs was used to characterize the taxonomic differentiation between localities and regions. According to our results, the fauna from Simssee shows close similarities with those from Switzerland, Austria, France and northern Germany. Faunal similarities and differences are mainly related to tectonic events and oceanographic variables (i.e. migration through seaway passages) or might represent collecting biases.

弹性支流的遗骸在中新世沉积物中相当普遍，自19世纪中叶以来一直是众多研究的主题。尽管如此，Marine Molasse鲨鱼，rays鱼和溜冰鞋的分类学多样性仍然未知。在这里，我们描述了莫拉塞盆地中新世下部的37个分类单元：在物种级别上可以识别21个分类单元，而只能将15个分类单元分配给属，而一个分类单元则被保留为不合格种。该材料是从上巴伐利亚州辛西湖附近暴露的Achen组的Auwiesholz成员的矿床（中部布尔迪加利，奥特南纪中期，大约17.8 Ma）收集的。这种动物群是浅海，近岸，中上层和深水类群的混合物。Simssee的动物在地方和区域尺度上展现出不同的生物地理动态，可能与Eggenburgian-Ottnangian阶段发生的强烈的气候，海洋和构造事件有关。基于定性（存在/不存在）数据，建立了来自地中海和Paratethys的中新世软骨鱼类早期动物群与其他地区的动物群关系。中新世Molasse弹性分支的β多样性（Sørensen–Dice系数）用于表征地区和地区之间的分类学差异。根据我们的结果，Simssee的动物区系与瑞士，奥地利，法国和德国北部的动物区系极为相似。动物区系的相似性和差异性主要与构造事件和海洋变量（即通过航道的迁移）有关，或者可能代表着收集偏见。在Eggenburgian-Ottnangian阶段发生的海洋和构造事件。基于定性（存在/不存在）数据，建立了来自地中海和Paratethys的中新世软骨鱼类早期动物群与其他地区的动物群关系。中新世Molasse弹性分支的β多样性（Sørensen–Dice系数）用于表征地区和地区之间的分类学差异。根据我们的结果，Simssee的动物群与瑞士，奥地利，法国和德国北部的动物群极为相似。动物区系的相似性和差异性主要与构造事件和海洋变量（即通过航道的迁移）有关，或者可能代表着收集偏见。在Eggenburgian-Ottnangian阶段发生的海洋和构造事件。基于定性（存在/不存在）数据，建立了来自地中海和Paratethys的中新世软骨鱼类早期动物群与其他地区的动物群关系。中新世Molasse弹性分支的β多样性（Sørensen–Dice系数）用于表征地区和地区之间的分类学差异。根据我们的结果，Simssee的动物群与瑞士，奥地利，法国和德国北部的动物群极为相似。动物区系的相似性和差异性主要与构造事件和海洋变量（即通过航道的迁移）有关，或者可能代表着收集偏见。