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The first fossil record of the Sawshark Pliotrema (Pristiophoridae) from the Neogene of the South-East Pacific (Chile)


Guicharrousse-Vargas, Maurice; Villafaña, Jaime; Carrillo-Briceño, Jorge; Oyanadel-Urbina, Pablo; Figueroa, Romina; Pérez-Marín, José; Rivadeneira, Marcelo; Kriwet, Jürgen (2021). The first fossil record of the Sawshark Pliotrema (Pristiophoridae) from the Neogene of the South-East Pacific (Chile). Ameghiniana, 58(2):122-131.

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.

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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Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Department of Paleontology
Dewey Decimal Classification:560 Fossils & prehistoric life
Uncontrolled Keywords:Palaeontology, Ecology, Evolution, Behavior and Systematics
Language:English
Date:30 April 2021
Deposited On:04 May 2021 16:03
Last Modified:25 Jun 2024 01:39
Publisher:BioOne
ISSN:0002-7014
OA Status:Green
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.5710/amgh.01.03.2021.3389
  • Content: Accepted Version
  • Language: English