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The Neogene fossil record of Aetomylaeus (Elasmobranchii, Myliobatidae) from the south-eastern Pacific


Villafaña, Jaime A; Marramà, Giuseppe; Hernandez, Sebastian; Carrillo-Briceño, Jorge D; Hovestadt, Dirk; Kindlimann, Rene; Kriwet, Jürgen (2019). The Neogene fossil record of Aetomylaeus (Elasmobranchii, Myliobatidae) from the south-eastern Pacific. Journal of Vertebrate Paleontology:Epub ahead of print.

Abstract

ABSTRACT—The presence of eagle rays of the genus Aetomylaeus in the Neogene of the Temperate Pacific coast of South America (TPSA) still is ambiguous, although the fossil record of elasmobranch fishes (sharks, rays, and skates) from this area is quite good. Here, we present the first unmistakable fossil remains of Aetomylaeus from the Neogene of the TPSA. The material comprises 13 dental plates from one site in Peru and six localities in Chile ranging in age from Miocene to Pliocene and was compared with dental plates of extant species. Our study reveals that the number of tooth rows and the shape of lateral teeth in extant species are seemingly very variable and need to be established before fossil specimens can be confidently identified. Consequently, we do not assign the fossil specimens from the Neogene of the TPSA to any species but leave them as Aetomylaeus. Moreover, we recognized that only the shape of medial teeth provides reliable diagnostic characters in our material, whereas the shape and number of lateral teeth are highly variable, similar to the condition seen in extant species.

Abstract

ABSTRACT—The presence of eagle rays of the genus Aetomylaeus in the Neogene of the Temperate Pacific coast of South America (TPSA) still is ambiguous, although the fossil record of elasmobranch fishes (sharks, rays, and skates) from this area is quite good. Here, we present the first unmistakable fossil remains of Aetomylaeus from the Neogene of the TPSA. The material comprises 13 dental plates from one site in Peru and six localities in Chile ranging in age from Miocene to Pliocene and was compared with dental plates of extant species. Our study reveals that the number of tooth rows and the shape of lateral teeth in extant species are seemingly very variable and need to be established before fossil specimens can be confidently identified. Consequently, we do not assign the fossil specimens from the Neogene of the TPSA to any species but leave them as Aetomylaeus. Moreover, we recognized that only the shape of medial teeth provides reliable diagnostic characters in our material, whereas the shape and number of lateral teeth are highly variable, similar to the condition seen in extant species.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Paleontological Institute and Museum
Dewey Decimal Classification:560 Fossils & prehistoric life
Uncontrolled Keywords:Palaeontology
Language:English
Date:2 April 2019
Deposited On:02 Apr 2019 15:54
Last Modified:02 Apr 2019 16:02
Publisher:Taylor & Francis
ISSN:0272-4634
OA Status:Closed
Publisher DOI:https://doi.org/10.1080/02724634.2019.1577251

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