An Oldest Record of the Shark Cosmopolitodus planus (Lamnidae) from the Lower Miocene of the Sakhalin, Russia

IF 0.5 4区生物学 Q4 FISHERIES

Journal of Ichthyology Pub Date : 2023-12-29 DOI:10.1134/s0032945224010144

T. P. Malyshkina, M. V. Nazarkin, A. V. Solovyow

引用次数: 0

Abstract

An isolate tooth of a rare extinct hook-toothed mako Cosmopolitodus planus (Agassiz, 1856), discovered in the Lower Miocene deposits of the Chekhov Formation of Sakhalin Island is described. This extinct species was distributed exceptionally in the Pacific basin, and is known mainly from the deposits of the Middle and Upper Miocene. Thus, the described tooth is, probably, the oldest record of this species. The geographic and stratigraphic distribution of this species, as well as the validity of the genus Cosmopolitodus Glickman, 1964, are discussed.

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俄罗斯萨哈林下中新世鲨鱼 Cosmopolitodus planus (Lamnidae) 的最古老记录

摘要描述了在萨哈林岛契诃夫地层的下中新世沉积中发现的一种罕见的已灭绝钩齿鲭鱼 Cosmopolitodus planus (Agassiz, 1856) 的分离牙齿。这种已经灭绝的物种在太平洋盆地分布异常稀少，目前所知的主要是中新世中、上新世的沉积物。因此，所描述的牙齿可能是该物种最古老的记录。本文讨论了该物种的地理分布和地层分布，以及 Cosmopolitodus Glickman（1964 年）属的有效性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Ichthyology Multiple-

CiteScore

1.00

自引率

28.60%

发文量

期刊介绍： Journal of Ichthyology is an international peer-reviewed journal published in collaboration with the Russian Academy of Sciences. It covers original studies in fish taxonomy, evolution, molecular biology, morphology, species diversity, zoological geography, genetics, physiology, ecology, behavior, reproduction, embryology, invasions, and protection. Some problems of applied ichthyology are also covered. The journal welcomes manuscripts from all countries in the English or Russian language.