东南太平洋(智利)新近纪锯鲨(Pristiophoridae)的首个化石记录

IF 1.2 4区地球科学 Q3 PALEONTOLOGY

Ameghiniana Pub Date : 2021-04-30 DOI:10.5710/AMGH.01.03.2021.3389

Maurice Guicharrousse-Vargas, Jaime A. Villafaña, J. Carrillo-Briceño, Pablo Oyanadel-Urbina, Romina Figueroa, J. Pérez-Marín, M. Rivadeneira, J. Kriwet

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引用次数: 1

摘要

摘要我们展示了东南太平洋锯鲨属Pliotrema的第一个化石记录。被检查的材料是从智利阿塔卡马地区一个鲜为人知的化石产地“考尔德火山区”获得的。含化石矿床属于Bahía Inglesa组，其年龄很可能为中新世中期至上新世早期。东太平洋没有这种锯鱼的现存物种，可能是由于新第三纪冷却条件的出现。根据现存物种的水深亲缘关系，本研究中报告的蓝鳃类的环境类型被解释为底层。我们的研究结果表明，未来的研究需要更好地了解这种锯鲨属的进化史和过去的分布，以及它们对当前生物地理模式的影响。

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The First Fossil Record of the Sawshark Pliotrema (Pristiophoridae) from the Neogene of the Southeastern Pacific (Chile)

Abstract. We present the first fossil record of the sawshark genus Pliotrema from the south-eastern Pacific Ocean. The examined material was obtained from a little-known fossil locality named “Arenas de Caldera” in the Atacama Region of Chile. The fossiliferous deposits belong to the Bahía Inglesa Formation, which is most likely middle Miocene–early Pliocene in age. There are no extant species of this sawfish in the eastern Pacific, probably due to the onset of cooling conditions during the Neogene. The type of environment for the elasmobranchs reported in this study is interpreted as demersal, based on the bathymetric affinities of extant species. Our results show that future studies are needed to better understand the evolutionary history and past distributions of this sawshark genus and their implications on current biogeographic patterns.

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来源期刊

Ameghiniana 地学-古生物学

CiteScore

2.50

自引率

10.00%

发文量

期刊介绍： Ameghiniana is a bimonthly journal that publishes original contributions on all disciplines related to paleontology, with a special focus on the paleontology of Gondwana and the biotic history of the southern hemisphere. Published yearly since 1957, it has undoubtedly become the main palaeontological publication from Latin America. Ameghiniana has recently broadened its editorial board, reorganized its production process, and increased to a bimonthly frequency, which resulted in a significant decrease in the turn around time.