Eocene ungulate mammals from West Antarctica: Implications from their fossil record and a new species
Here we describe a new terrestrial mammal from the Eocene of Seymour Island (Isla Marambio) represented by a lower left third molar and assigned to a new species of Sparnotheriodontidae, an ungulate family with a broad palaeobiogeographical distribution in South America. The specimen was found in th...
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ftconicet:oai:ri.conicet.gov.ar:11336/56552 2023-10-09T21:46:08+02:00 Eocene ungulate mammals from West Antarctica: Implications from their fossil record and a new species Gelfo, Javier Nicolás López, Guillermo M. Santillana, Sergio N. application/pdf http://hdl.handle.net/11336/56552 eng eng Cambridge University Press info:eu-repo/semantics/altIdentifier/doi/10.1017/S0954102017000244 info:eu-repo/semantics/altIdentifier/url/https://www.cambridge.org/core/journals/antarctic-science/article/eocene-ungulate-mammals-from-west-antarctica-implications-from-their-fossil-record-and-a-new-species/688D00D6AE34CC431E09BE721A23B410 http://hdl.handle.net/11336/56552 Gelfo, Javier Nicolás; López, Guillermo M.; Santillana, Sergio N.; Eocene ungulate mammals from West Antarctica: Implications from their fossil record and a new species; Cambridge University Press; Antarctic Science; 29; 5; 10-2017; 445-455 0954-1020 CONICET Digital CONICET info:eu-repo/semantics/restrictedAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ LAND MAMMAL LITOPTERNA NOTIOLOFOS SEYMOUR ISLAND SPARNOTHERIODONTIDAE https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion ftconicet https://doi.org/10.1017/S0954102017000244 2023-09-24T18:50:16Z Here we describe a new terrestrial mammal from the Eocene of Seymour Island (Isla Marambio) represented by a lower left third molar and assigned to a new species of Sparnotheriodontidae, an ungulate family with a broad palaeobiogeographical distribution in South America. The specimen was found in the Cucullaea I allomember of the La Meseta Formation, in a new mammalian locality (IAA 2/16). Notiolofos regueroi sp. nov. shares a brachyodont, lophoselenodont and bicrescentic molar pattern with N. arquinotiensis, recorded for a stratigraphic sequence of 17.5 Ma in Antarctica. The criteria for the species differentiation are the absence of mesial and labial cingulids, the larger paraconid, the wider talonid basin, the accentuated distal projection of the hypoconulid, the centroconid development and the smaller size. Together with the astrapotherian Antarctodon sobrali, they represent the medium to large terrestrial mammals of the early Eocene Antarctic landscape that was mostly dominated by closed forests of Nothofagus. Dental wear facets and differences in their body mass are inferred and discussed as possible evidence of niche differentiation. Additionally, the presence of land mammals with Patagonian affinities in the Eocene of Antarctica reinforces the Cretaceous-Palaeocene presence of the Weddellian Isthmus, a functional land corridor between Antarctica and South America. Fil: Gelfo, Javier Nicolás. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Paleontología Vertebrados; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: López, Guillermo M. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Paleontología Vertebrados; Argentina Fil: Santillana, Sergio N. Ministerio de Relaciones Exteriores, Comercio Interno y Culto. Dirección Nacional del Antártico. Instituto Antártico Argentino; Argentina Article in Journal/Newspaper Antarc* Antarctic Antarctic Science Antarctica Dirección Nacional del Antártico Instituto Antártico Argentino Seymour Island West Antarctica CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) Antarctic West Antarctica Argentino Argentina Seymour ENVELOPE(-56.767,-56.767,-64.283,-64.283) Seymour Island ENVELOPE(-56.750,-56.750,-64.283,-64.283) Marambio ENVELOPE(-56.750,-56.750,-64.283,-64.283) isla Marambio ENVELOPE(-56.635,-56.635,-64.239,-64.239) Antarctic Science 29 5 445 455 |
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Open Polar |
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CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) |
op_collection_id |
ftconicet |
language |
English |
topic |
LAND MAMMAL LITOPTERNA NOTIOLOFOS SEYMOUR ISLAND SPARNOTHERIODONTIDAE https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
spellingShingle |
LAND MAMMAL LITOPTERNA NOTIOLOFOS SEYMOUR ISLAND SPARNOTHERIODONTIDAE https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 Gelfo, Javier Nicolás López, Guillermo M. Santillana, Sergio N. Eocene ungulate mammals from West Antarctica: Implications from their fossil record and a new species |
topic_facet |
LAND MAMMAL LITOPTERNA NOTIOLOFOS SEYMOUR ISLAND SPARNOTHERIODONTIDAE https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
description |
Here we describe a new terrestrial mammal from the Eocene of Seymour Island (Isla Marambio) represented by a lower left third molar and assigned to a new species of Sparnotheriodontidae, an ungulate family with a broad palaeobiogeographical distribution in South America. The specimen was found in the Cucullaea I allomember of the La Meseta Formation, in a new mammalian locality (IAA 2/16). Notiolofos regueroi sp. nov. shares a brachyodont, lophoselenodont and bicrescentic molar pattern with N. arquinotiensis, recorded for a stratigraphic sequence of 17.5 Ma in Antarctica. The criteria for the species differentiation are the absence of mesial and labial cingulids, the larger paraconid, the wider talonid basin, the accentuated distal projection of the hypoconulid, the centroconid development and the smaller size. Together with the astrapotherian Antarctodon sobrali, they represent the medium to large terrestrial mammals of the early Eocene Antarctic landscape that was mostly dominated by closed forests of Nothofagus. Dental wear facets and differences in their body mass are inferred and discussed as possible evidence of niche differentiation. Additionally, the presence of land mammals with Patagonian affinities in the Eocene of Antarctica reinforces the Cretaceous-Palaeocene presence of the Weddellian Isthmus, a functional land corridor between Antarctica and South America. Fil: Gelfo, Javier Nicolás. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Paleontología Vertebrados; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: López, Guillermo M. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Paleontología Vertebrados; Argentina Fil: Santillana, Sergio N. Ministerio de Relaciones Exteriores, Comercio Interno y Culto. Dirección Nacional del Antártico. Instituto Antártico Argentino; Argentina |
format |
Article in Journal/Newspaper |
author |
Gelfo, Javier Nicolás López, Guillermo M. Santillana, Sergio N. |
author_facet |
Gelfo, Javier Nicolás López, Guillermo M. Santillana, Sergio N. |
author_sort |
Gelfo, Javier Nicolás |
title |
Eocene ungulate mammals from West Antarctica: Implications from their fossil record and a new species |
title_short |
Eocene ungulate mammals from West Antarctica: Implications from their fossil record and a new species |
title_full |
Eocene ungulate mammals from West Antarctica: Implications from their fossil record and a new species |
title_fullStr |
Eocene ungulate mammals from West Antarctica: Implications from their fossil record and a new species |
title_full_unstemmed |
Eocene ungulate mammals from West Antarctica: Implications from their fossil record and a new species |
title_sort |
eocene ungulate mammals from west antarctica: implications from their fossil record and a new species |
publisher |
Cambridge University Press |
url |
http://hdl.handle.net/11336/56552 |
long_lat |
ENVELOPE(-56.767,-56.767,-64.283,-64.283) ENVELOPE(-56.750,-56.750,-64.283,-64.283) ENVELOPE(-56.750,-56.750,-64.283,-64.283) ENVELOPE(-56.635,-56.635,-64.239,-64.239) |
geographic |
Antarctic West Antarctica Argentino Argentina Seymour Seymour Island Marambio isla Marambio |
geographic_facet |
Antarctic West Antarctica Argentino Argentina Seymour Seymour Island Marambio isla Marambio |
genre |
Antarc* Antarctic Antarctic Science Antarctica Dirección Nacional del Antártico Instituto Antártico Argentino Seymour Island West Antarctica |
genre_facet |
Antarc* Antarctic Antarctic Science Antarctica Dirección Nacional del Antártico Instituto Antártico Argentino Seymour Island West Antarctica |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1017/S0954102017000244 info:eu-repo/semantics/altIdentifier/url/https://www.cambridge.org/core/journals/antarctic-science/article/eocene-ungulate-mammals-from-west-antarctica-implications-from-their-fossil-record-and-a-new-species/688D00D6AE34CC431E09BE721A23B410 http://hdl.handle.net/11336/56552 Gelfo, Javier Nicolás; López, Guillermo M.; Santillana, Sergio N.; Eocene ungulate mammals from West Antarctica: Implications from their fossil record and a new species; Cambridge University Press; Antarctic Science; 29; 5; 10-2017; 445-455 0954-1020 CONICET Digital CONICET |
op_rights |
info:eu-repo/semantics/restrictedAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
op_doi |
https://doi.org/10.1017/S0954102017000244 |
container_title |
Antarctic Science |
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29 |
container_issue |
5 |
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445 |
op_container_end_page |
455 |
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1779321781477179392 |