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

Autores
Gelfo, Javier Nicolás; Mörs, Thomas; Lorente, Malena; López, Guillermo Marcos; Reguero, Marcelo Alfredo
Año de publicación
2015
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
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.
Facultad de Ciencias Naturales y Museo
Materia
Paleontología
West Antarctica
Palaeogene
Ypresian
Tooth and bone morphology
Ungulates
Sparnotheriodontidae
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/119193

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network_name_str SEDICI (UNLP)
spelling The oldest mammals from Antarctica, early Eocene of the La Meseta Formation, Seymour IslandGelfo, Javier NicolásMörs, ThomasLorente, MalenaLópez, Guillermo MarcosReguero, Marcelo AlfredoPaleontologíaWest AntarcticaPalaeogeneYpresianTooth and bone morphologyUngulatesSparnotheriodontidaeNew 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.Facultad de Ciencias Naturales y Museo2015info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf101-110http://sedici.unlp.edu.ar/handle/10915/119193enginfo:eu-repo/semantics/altIdentifier/issn/1475-4983info:eu-repo/semantics/altIdentifier/doi/10.1111/pala.12121info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc/4.0/Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T11:28:05Zoai:sedici.unlp.edu.ar:10915/119193Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:28:05.887SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv The oldest mammals from Antarctica, early Eocene of the La Meseta Formation, Seymour Island
title The oldest mammals from Antarctica, early Eocene of the La Meseta Formation, Seymour Island
spellingShingle The oldest mammals from Antarctica, early Eocene of the La Meseta Formation, Seymour Island
Gelfo, Javier Nicolás
Paleontología
West Antarctica
Palaeogene
Ypresian
Tooth and bone morphology
Ungulates
Sparnotheriodontidae
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 The oldest mammals from Antarctica, early Eocene of the La Meseta Formation, Seymour Island
dc.creator.none.fl_str_mv Gelfo, Javier Nicolás
Mörs, Thomas
Lorente, Malena
López, Guillermo Marcos
Reguero, Marcelo Alfredo
author Gelfo, Javier Nicolás
author_facet Gelfo, Javier Nicolás
Mörs, Thomas
Lorente, Malena
López, Guillermo Marcos
Reguero, Marcelo Alfredo
author_role author
author2 Mörs, Thomas
Lorente, Malena
López, Guillermo Marcos
Reguero, Marcelo Alfredo
author2_role author
author
author
author
dc.subject.none.fl_str_mv Paleontología
West Antarctica
Palaeogene
Ypresian
Tooth and bone morphology
Ungulates
Sparnotheriodontidae
topic Paleontología
West Antarctica
Palaeogene
Ypresian
Tooth and bone morphology
Ungulates
Sparnotheriodontidae
dc.description.none.fl_txt_mv 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.
Facultad de Ciencias Naturales y Museo
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.
publishDate 2015
dc.date.none.fl_str_mv 2015
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Articulo
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
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dc.identifier.none.fl_str_mv http://sedici.unlp.edu.ar/handle/10915/119193
url http://sedici.unlp.edu.ar/handle/10915/119193
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/issn/1475-4983
info:eu-repo/semantics/altIdentifier/doi/10.1111/pala.12121
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc/4.0/
Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc/4.0/
Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)
dc.format.none.fl_str_mv application/pdf
101-110
dc.source.none.fl_str_mv reponame:SEDICI (UNLP)
instname:Universidad Nacional de La Plata
instacron:UNLP
reponame_str SEDICI (UNLP)
collection SEDICI (UNLP)
instname_str Universidad Nacional de La Plata
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repository.name.fl_str_mv SEDICI (UNLP) - Universidad Nacional de La Plata
repository.mail.fl_str_mv alira@sedici.unlp.edu.ar
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