During the early and middle Miocene, the Dinarides Lake System (DLS) was a major hotspot of freshwater mollusk diversity in southeastern Europe. The numerous intramontane lake basins, originating by combined effects of tectonic subsidence and humid climate, accumulated thick lacustrine successions. Diagenetic overprint and leaching of these carbonate-rich deposits have facilitated insights to faunal contents for only a few basins up to the present. We contribute to filling this gap by documenting for the first time a mollusk fauna from the Bugojno Basin in Bosnia and Herzegovina. The fauna originates from a coal-bearing succession representing a gradual flooding of the coastal wetlands followed upwards by the establishment of perennial lacustrine settings in the basin. Our taxonomic analyses documents 17 gastropod and two bivalve species. New to science are IIllyricocongeria forcakovici nov. sp., Prososthenia krijgsmani nov. sp. and Bania goehlichae nov. sp. The palaeoecological analysis based on quantified samples shows distinct shifts in mollusk composition and abundance. The terrestrial taxa are restricted to the coal-bearing interval of the section; melanopsids, neritids and hydrobiids are abundant in deltaic and littoral settings, whereas bivalves are frequent in littoral and sublittoral environments. In line with previous results, which have evidenced a high degree of intralacustrine radiation in the DLS, the Lake Bugojno fauna shows a low to moderate level of similarity to other DLS faunas. The dissimilarity may partly also result from its younger age as suggested by the presence or absence of regional biostratigraphic marker species.

中文翻译：

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波斯尼亚和黑塞哥维那Bugojno附近Gračanica煤坑中的中新世软体动物群的分类学，古生态学和地层学

在中新世早期和中期，迪纳里德斯湖系统（DLS）是东南欧淡水软体动物多样性的主要热点。由构造沉降和潮湿气候共同作用产生的众多山地内湖盆积聚了厚厚的湖相演替。这些富含碳酸盐的沉积物的成岩作用和淋溶作用促进了迄今为止仅有的几个盆地动物群含量的认识。我们通过首次记录波斯尼亚和黑塞哥维那布戈尼诺盆地的软体动物区系，为填补这一空白做出了贡献。动物区系来自含煤演替，代表了沿海湿地的逐渐泛滥，随后在盆地中建立了多年生的湖泊环境。我们的分类学分析记录了17个腹足动物和两个双壳类。II.lyricocongeria forcakovici。sp。，Prososthenia krijgsmani nov。sp。和Bania goehlichae十一月 sp。基于定量样本的古生态分析显示，软体动物的组成和丰度发生了明显的变化。地面分类单元仅限于该部分的含煤间隔；在三角洲和沿海地区，黑皮动物，蛇足类和水生生物丰富，而在沿海和沿海地区环境中，双壳类动物很常见。与以前的结果（已证明DLS中湖内放射高度）一致，Bugojno湖动物区系与其他DLS动物区系的相似性低至中度。如存在或不存在区域生物地层标记物物种所暗示的，这种差异也可能部分是由于其年龄较小。