Eocene ungulate mammals from West Antarctica: implications from their fossil record and a new species

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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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Autores principales: Gelfo, Javier Nicolás, López, Guillermo Marcos, Santillana, Sergio N.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2017
Materias:
Paleontología
land mammal
Litopterna
Notiolofos
Seymour Island
Sparnotheriodontidae
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/87321
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-87321
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Paleontología
land mammal
Litopterna
Notiolofos
Seymour Island
Sparnotheriodontidae
spellingShingle Paleontología
land mammal
Litopterna
Notiolofos
Seymour Island
Sparnotheriodontidae
Gelfo, Javier Nicolás
López, Guillermo Marcos
Santillana, Sergio N.
Eocene ungulate mammals from West Antarctica: implications from their fossil record and a new species
topic_facet Paleontología
land mammal
Litopterna
Notiolofos
Seymour Island
Sparnotheriodontidae
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.
format Articulo
Articulo
author Gelfo, Javier Nicolás
López, Guillermo Marcos
Santillana, Sergio N.
author_facet Gelfo, Javier Nicolás
López, Guillermo Marcos
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
publishDate 2017
url http://sedici.unlp.edu.ar/handle/10915/87321
work_keys_str_mv AT gelfojaviernicolas eoceneungulatemammalsfromwestantarcticaimplicationsfromtheirfossilrecordandanewspecies
AT lopezguillermomarcos eoceneungulatemammalsfromwestantarcticaimplicationsfromtheirfossilrecordandanewspecies
AT santillanasergion eoceneungulatemammalsfromwestantarcticaimplicationsfromtheirfossilrecordandanewspecies
bdutipo_str Repositorios
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