Middle Eocene cartilaginous fishes (Vertebrata: Chondrichthyes) of the Dnieper-Donets Basin, northern Ukraine.

IF 2 4区 地球科学 Q1 Earth and Planetary Sciences
Oleksandr Kovalchuk, Jürgen Kriwet, Kenshu Shimada, Tamara Ryabokon, Zoltán Barkaszi, Anastasiia Dubikovska, Galina Anfimova, Svitozar Davydenko
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引用次数: 0

Abstract

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 (Edaphodon bucklandi), 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 Carcharodon megalotis, C. lanceolatus, C. productus, Lamna cuspidata, L. denticulata, L. compressa, L. (Odontaspis) hispida, L. lata, Oxyrhina brevidens, and O. biflena with more recently proposed taxa. Seven species erected by Rogovich (Galeocerdo paradoxus, Otodus microtus, Lamna elegans, Oxyrhina falcata, Oxyrhina leptodon, Chomatodus dubius, and Hybodus helophorus) are suggested to most likely be nomina dubia. 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.

乌克兰北部第聂伯河-顿涅茨河盆地的中始新世软骨鱼类(脊椎动物门:软骨鱼类)。
在始新世时期,现今乌克兰境内的海洋盆地栖息着各种软骨鱼类和硬骨鱼类、爬行动物、水鸟和海洋哺乳动物。19 世纪中叶,O.S. Rogovich 首次收集并描述了基辅及其附近地区古新世沉积物中的鱼类遗骸。在这里,我们对罗戈维奇收集的软骨鱼化石进行了重新研究,并对后来的一些记录进行了评估,所有这些化石都是从中始新世沉积物中发现的。我们总共分析和描述了 88 个标本,包括牙齿、脊椎骨和其他骨骼元素。结果,样本中发现了一个奇马目物种(Edaphodon bucklandi),以及 12 个鲨鱼类群和两个鳐类类群。其中 10 种鲨鱼被鉴定为鱼种,而鳐鱼只能被鉴定为较高的系统级别(Myliobatidae,Myliobatiformes)。这里提出了一些命名上的变化,包括将 Carcharodon megalotis、C. lanceolatus、C. productus、Lamna cuspidata、L. denticulata、L. compressa、L. (Odontaspis) hispida、L. lata、Oxyrhina brevidens 和 O. biflena 与最近提出的分类群进行同义。罗戈维奇提出的 7 个物种(Galeocerdo paradoxus、Otodus microtus、Lamna elegans、Oxyrhina falcata、Oxyrhina leptodon、Chomatodus dubius 和 Hybodus helophorus)很可能是 nomina dubia。许多已鉴定的类群代表了上层和中层鱼类,只有相对较少的类群属于底层、底栖和水层鱼类。所研究的样本具有重要的历史和科学价值,有助于人们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多样性。
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来源期刊
Palaeontologia Electronica
Palaeontologia Electronica 地学-古生物学
CiteScore
3.60
自引率
0.00%
发文量
20
审稿时长
>12 weeks
期刊介绍: Founded in 1997, Palaeontologia Electronica (PE) is the longest running open-access, peer-reviewed electronic journal and covers all aspects of palaeontology. PE uses an external double-blind peer review system for all manuscripts. Copyright of scientific papers is held by one of the three sponsoring professional societies at the author''s choice. Reviews, commentaries, and other material is placed in the public domain. PE papers comply with regulations for taxonomic nomenclature established in the International Code of Zoological Nomenclature and the International Code of Nomenclature for Algae, Fungi, and Plants.
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