Kovalchuk Oleksandr, Kriwet Jürgen, Shimada Kenshu, Ryabokon Tamara, Barkaszi Zoltán, Dubikovska Anastasiia, Anfimova Galina, Davydenko Svitozar
Department of Palaeontology, National Museum of Natural History, National Academy of Sciences of Ukraine, Bohdan Khmelnytskyi 15, Kyiv 01054 Ukraine; Department of Palaeozoology, Faculty of Biological Sciences, University of Wrocław, Sienkiewicza 21, Wrocław 50-335, Poland.
Department of Palaeontology, Faculty of Earth Sciences, Geography and Astronomy, University of Vienna, Josef-Holaubek-Platz 2, Vienna 1190, Austria; Vienna Doctoral School of Ecology and Evolution (VDSEE), University of Vienna, Josef-Holaubek-Platz 2, Vienna 1190, Austria.
Palaeontol Electronica. 2023 Aug 1;26(2):a32. doi: 10.26879/1283.
Marine basins that existed in present-day Ukraine during the Eocene harboured various groups of cartilaginous and bony fishes, reptiles, aquatic birds, and marine mammals. Fish remains from Paleogene deposits of Kyiv and its vicinities were first collected and described by O.S. Rogovich in the mid-19th century. Here we have carried out a re-examination of chondrichthyan fossils from Rogovich's collection and evaluated several later records, all of which were recovered from middle Eocene deposits. In total, 88 specimens represented by teeth, vertebrae, and other skeletal elements were analysed and described. As a result, the sample revealed to a single chimaeriform species , and 12 shark and two ray taxa, respectively. Ten sharks were identified to species level, whereas the rays could be identified only at higher systematic ranks (Myliobatidae, Myliobatiformes). Several nomenclatural changes are proposed here, including the synonimisation of , and with more recently proposed taxa. Seven species erected by Rogovich , and ) are suggested to most likely be . Many identified taxa represent the epi- and mesopelagic fishes and only a relatively small number of them belong to benthopelagic, demersal, and bathydemersal forms. The studied sample is of important historical and scientific value and substantially contribute to the understanding of the palaeodiversity of Eocene marine ecosystems that existed in present-day Ukraine and generally in Eastern Europe.
始新世时期现今乌克兰境内的海洋盆地栖息着各类软骨鱼和硬骨鱼、爬行动物、水鸟及海洋哺乳动物。基辅及其周边地区古近纪沉积物中的鱼类遗骸最早是由O.S.罗戈维奇在19世纪中叶收集并描述的。在此，我们对罗戈维奇收藏的软骨鱼类化石进行了重新研究，并评估了一些后来的记录，所有这些化石均采自始新世中期的沉积物。总共分析并描述了88个由牙齿、脊椎和其他骨骼元素代表的标本。结果显示，该样本分别包含一个银鲛目物种、12个鲨鱼分类单元和两个鳐分类单元。其中10种鲨鱼已鉴定到物种水平，而鳐类仅能鉴定到较高的分类等级（鲼科、鲼形目）。本文提出了一些命名上的更改，包括将[具体名称1]、[具体名称2]和[具体名称3]与最近提出的分类单元进行同义处理。罗戈维奇建立的7个物种（[具体物种1]、[具体物种2]等）很可能是[具体建议的物种]。许多已鉴定的分类单元代表了上层和中层远洋鱼类，只有相对较少的一部分属于底栖-中上层、底栖和深海底层鱼类。所研究的样本具有重要的历史和科学价值，极大地有助于了解现今乌克兰乃至整个东欧地区始新世海洋生态系统的古生物多样性。
