The oldest mammals from Antarctica, early Eocene of the La Meseta Formation, Seymour Island

New fossil mammals found at the base of Acantilados II Allomember of the La Meseta Formation, from the early Eocene (Ypresian) of Seymour Island, represent the oldest evidence of this group in Antarctica. Two specimens are here described; the first belongs to a talonid portion of a lower right molar...

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Detalles Bibliográficos
Autores principales: Gelfo, Javier Nicolás, Mörs, Thomas, Lorente, Malena, López, Guillermo Marcos, Reguero, Marcelo Alfredo
Formato: Articulo
Lenguaje:Inglés
Publicado: 2015
Materias:
Paleontología
West Antarctica
Palaeogene
Ypresian
Tooth and bone morphology
Ungulates
Sparnotheriodontidae
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/119193
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-119193
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Paleontología
West Antarctica
Palaeogene
Ypresian
Tooth and bone morphology
Ungulates
Sparnotheriodontidae
spellingShingle Paleontología
West Antarctica
Palaeogene
Ypresian
Tooth and bone morphology
Ungulates
Sparnotheriodontidae
Gelfo, Javier Nicolás
Mörs, Thomas
Lorente, Malena
López, Guillermo Marcos
Reguero, Marcelo Alfredo
The oldest mammals from Antarctica, early Eocene of the La Meseta Formation, Seymour Island
topic_facet Paleontología
West Antarctica
Palaeogene
Ypresian
Tooth and bone morphology
Ungulates
Sparnotheriodontidae
description New fossil mammals found at the base of Acantilados II Allomember of the La Meseta Formation, from the early Eocene (Ypresian) of Seymour Island, represent the oldest evidence of this group in Antarctica. Two specimens are here described; the first belongs to a talonid portion of a lower right molar assigned to the sparnotheriodontid litoptern Notiolofos sp. cf. N. arquinotiensis. Sparnotheriodontid were medium- to large-sized ungulates, with a wide distribution in the Eocene of South America and Antarctica. The second specimen is an intermediate phalanx referred to an indeterminate Eutheria, probably a South American native ungulate. These Antarctic findings in sediments of 55.3 Ma query the minimum age needed for terrestrial mammals to spread from South America to Antarctica, which should have occurred before the final break-up of Gondwana. This event involves the disappearance of the land bridge formed by the Weddellian Isthmus, which connected West Antarctica and southern South America from the Late Cretaceous until sometime in the earliest Palaeogene.
format Articulo
Articulo
author Gelfo, Javier Nicolás
Mörs, Thomas
Lorente, Malena
López, Guillermo Marcos
Reguero, Marcelo Alfredo
author_facet Gelfo, Javier Nicolás
Mörs, Thomas
Lorente, Malena
López, Guillermo Marcos
Reguero, Marcelo Alfredo
author_sort Gelfo, Javier Nicolás
title The oldest mammals from Antarctica, early Eocene of the La Meseta Formation, Seymour Island
title_short The oldest mammals from Antarctica, early Eocene of the La Meseta Formation, Seymour Island
title_full The oldest mammals from Antarctica, early Eocene of the La Meseta Formation, Seymour Island
title_fullStr The oldest mammals from Antarctica, early Eocene of the La Meseta Formation, Seymour Island
title_full_unstemmed The oldest mammals from Antarctica, early Eocene of the La Meseta Formation, Seymour Island
title_sort oldest mammals from antarctica, early eocene of the la meseta formation, seymour island
publishDate 2015
url http://sedici.unlp.edu.ar/handle/10915/119193
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