New Metatherian Mammal from the Early Eocene of Antarctica

A new Paleogene metatherian from locality IAA 1/90, Marambio (Seymour) Island in the Antarctic Peninsula is described. <i>Pujatodon ektopos</i>, gen. et sp. nov., is recognized on the basis of a tiny lower left molar recovered from early Eocene (late Ypresian) levels of the <i>Cucu...

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Detalles Bibliográficos
Autores principales: Goin, Francisco Javier, Vieytes, Emma Carolina, Gelfo, Javier Nicolás, Chornogubsky, Laura, Zimicz, Ana Natalia, Reguero, Marcelo Alfredo
Formato: Articulo
Lenguaje:Inglés
Publicado: 2020
Materias:
Ciencias Naturales
Antarctic Peninsula
La Meseta Formation
Late Ypresian
Polydolopimorphia
Enamel microstructure
Paleobiology
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/131626
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-131626
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Naturales
Antarctic Peninsula
La Meseta Formation
Late Ypresian
Polydolopimorphia
Enamel microstructure
Paleobiology
spellingShingle Ciencias Naturales
Antarctic Peninsula
La Meseta Formation
Late Ypresian
Polydolopimorphia
Enamel microstructure
Paleobiology
Goin, Francisco Javier
Vieytes, Emma Carolina
Gelfo, Javier Nicolás
Chornogubsky, Laura
Zimicz, Ana Natalia
Reguero, Marcelo Alfredo
New Metatherian Mammal from the Early Eocene of Antarctica
topic_facet Ciencias Naturales
Antarctic Peninsula
La Meseta Formation
Late Ypresian
Polydolopimorphia
Enamel microstructure
Paleobiology
description A new Paleogene metatherian from locality IAA 1/90, Marambio (Seymour) Island in the Antarctic Peninsula is described. <i>Pujatodon ektopos</i>, gen. et sp. nov., is recognized on the basis of a tiny lower left molar recovered from early Eocene (late Ypresian) levels of the <i>Cucullaea</i> I Allomember, La Meseta Formation. The tooth is characterized by its small size, bunoid aspect, short trigonid with closely set paraconid and metaconid, wide and long talonid, the development of an incipient cingulid at the labial base of the crown between the trigonid and talonid, and an expanded posterior cingulid. Body mass estimations for the new taxon range from 83.13 to 153.15 g. Its enamel microstructure shows the earliest evidence among metatherians of aligned prisms, as well as of interprismatic sheets of matrix. The analysis of other parameters, like body mass, molar morphometric index, and wear facets, suggests that the molars of <i>Pujatodon</i> were primarily adapted to the processing of fruits, nuts, seeds, and/or hard insects. Several features suggest the allocation of this specimen among basal polydolopimorphians (Prepidolopidae or, more probably, Glasbiidae). The discovery of the specimen MLP 14-I-10-20 could offer new insights on the origins and early diversification of Australidelphian marsupials in southern (and northern?) continents. It also adds significant information on the diversity of Antarctic Paleogene mammals, their evolution, habits, and historical biogeography.
format Articulo
Articulo
author Goin, Francisco Javier
Vieytes, Emma Carolina
Gelfo, Javier Nicolás
Chornogubsky, Laura
Zimicz, Ana Natalia
Reguero, Marcelo Alfredo
author_facet Goin, Francisco Javier
Vieytes, Emma Carolina
Gelfo, Javier Nicolás
Chornogubsky, Laura
Zimicz, Ana Natalia
Reguero, Marcelo Alfredo
author_sort Goin, Francisco Javier
title New Metatherian Mammal from the Early Eocene of Antarctica
title_short New Metatherian Mammal from the Early Eocene of Antarctica
title_full New Metatherian Mammal from the Early Eocene of Antarctica
title_fullStr New Metatherian Mammal from the Early Eocene of Antarctica
title_full_unstemmed New Metatherian Mammal from the Early Eocene of Antarctica
title_sort new metatherian mammal from the early eocene of antarctica
publishDate 2020
url http://sedici.unlp.edu.ar/handle/10915/131626
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