A new species of the enigmatic shark genus Nanocetorhinus (Chondrichthyes) from the Oligocene of Austria with palaeoceanographic implications

IF 1.7 4区地球科学 Q2 Earth and Planetary Sciences

Austrian Journal of Earth Sciences Pub Date : 2020-06-01 DOI:10.17738/ajes.2020.0014

I. Feichtinger, J. Pollerspöck, M. Harzhauser

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引用次数: 2

Abstract

Abstract Deep-neritic sediments of the Eferding Formation (Egerian, Upper Oligocene) of Upper Austria from the Kamig kaolinite quarry revealed minute teeth of the putatively planktivorous shark genus Nanocetorhinus. This is the oldest unambiguous record of this rarely documented genus, which was known so far only from Miocene deposits of Europe, North America and Japan. Based on previous studies, which showed a positive correlation between sediments of nutrient rich waters and plankton blooms with a majority of ichthyoliths of Keasius and Nanocetorhinus, we argue for a filter-feeding and migratory lifestyle of the latter. Thus, it is supposed that Nanocetorhinus migrated seasonally for foraging, in a similar way to the extant basking shark Cetorhinus maximus. This mode of life and the wide paleogeographic distribution of the open marine genus Nanocetorhinus requires a deep and fully marine connection between the Paratethys and the Proto-Mediterranean Sea during late Oligocene times, which might have been established via the Slovenian Corridor.

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奥地利渐新世神秘鲨鱼属Nanocetorhinus（软骨鱼目）的一个新种，具有古海洋学意义

摘要Kamig高岭石采石场上奥地利Eferding组（Egerian，上渐新世）的深层浅海沉积物显示了假定的浮游鲨鱼属Nanocetorhinus的微小牙齿。这是这个罕见的属的最古老的明确记录，迄今为止只从欧洲、北美和日本的中新世沉积物中知道。先前的研究表明，营养丰富的水域沉积物和浮游生物繁殖与Keasius和Nanocetorinus的大多数鱼石呈正相关，我们认为后者是滤食性和迁徙生活方式。因此，人们认为Nanocetorinus是季节性迁徙觅食的，其方式与现存的姥鲨Cetorhinus maximus相似。这种生活方式和开阔海洋属Nanocetorhinus的广泛古地理分布要求在渐新世晚期，副特提斯和原地中海之间建立一种深层和完全的海洋联系，这种联系可能是通过斯洛文尼亚走廊建立的。

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来源期刊

Austrian Journal of Earth Sciences Earth and Planetary Sciences-Paleontology

CiteScore

3.10

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： AUSTRIAN JOURNAL OF EARTH SCIENCES is the official journal of the Austrian Geological, Mineralogical and Palaeontological Societies, hosted by a country that is famous for its spectacular mountains that are the birthplace for many geological and mineralogical concepts in modern Earth science. AUSTRIAN JOURNAL OF EARTH SCIENCE focuses on all aspects relevant to the geosciences of the Alps, Bohemian Massif and surrounding areas. Contributions on other regions are welcome if they embed their findings into a conceptual framework that relates the contribution to Alpine-type orogens and Alpine regions in general, and are thus relevant to an international audience. Contributions are subject to peer review and editorial control according to SCI guidelines to ensure that the required standard of scientific excellence is maintained.