A new insectivoran-like metatherian from western Argentina (Quebrada Fiera, Mendoza Province, Deseadan Age, late Oligocene)
A new metatherian was recently found in the Quebrada Fiera locality (southern Mendoza Province, Argentina), in late Oligocene deposits (Agua de la Piedra Formation; Deseadan SALMA). The specimen consists of fragments of both dentaries, the right maxilla, and a fragment of the left premaxilla with de...
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Autores principales: | , , , |
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Formato: | Objeto de conferencia Resumen |
Lenguaje: | Inglés |
Publicado: |
2010
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Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/16674 |
Aporte de: |
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I19-R120-10915-16674 |
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dspace |
institution |
Universidad Nacional de La Plata |
institution_str |
I-19 |
repository_str |
R-120 |
collection |
SEDICI (UNLP) |
language |
Inglés |
topic |
Ciencias Naturales Paleontología Insectivoran Metatherian Argentina |
spellingShingle |
Ciencias Naturales Paleontología Insectivoran Metatherian Argentina Forasiepi, Analía Goin, Francisco Javier Sigé, Bernard Cerdeño Serrano, María Esperanza A new insectivoran-like metatherian from western Argentina (Quebrada Fiera, Mendoza Province, Deseadan Age, late Oligocene) |
topic_facet |
Ciencias Naturales Paleontología Insectivoran Metatherian Argentina |
description |
A new metatherian was recently found in the Quebrada Fiera locality (southern Mendoza Province, Argentina), in late Oligocene deposits (Agua de la Piedra Formation; Deseadan SALMA). The specimen consists of fragments of both dentaries, the right maxilla, and a fragment of the left premaxilla with dentition, all belonging to a single, subadult individual. The teeth are represented by seven upper and lower antemolars and at least three molars, with an inferred dental formula of I/I?3/3, C/c1/1, P/p3/3, M/m?3/?3. Among the most conspicuous dental features are worth mentioning the following: caniniform-like first upper incisor; enlarged and flattened second and third upper incisors; large, procumbent first lower incisor; a single deciduous tooth in the upper and lower dentitions with complex morphology; upper molars with a broad stylar shelf bearing a tall StB (slightly lower than metacone) and StD; parastyle developed at the end of the anterior cingulum, which is lower than the stylar shelf; hypoconelike talon, basal to the protocone at least in the M1; lower molars with reduced, low paraconid which is located close to the mid portion of the trigonid; low metaconid appresed to the protoconid in m1 and slightly distant in m2; columnar entoconid without the associated preentocristid; extremely reduced hypoconulid in median position, and lack of posterior cingulum. The new specimen has a unique combination of features among metatherians and other mammalian lineages of Deseadan age, including the well-known faunas from Patagonia. Several features are strongly convergent with erinaceomorphans, such as the presence of a large and procumbent first lower incisor, hypocone-like talon, and median hypoconulid. Its phylogenetic affinities are difficult to establish a priori, even though features of the dentition suggest probable derorhynchid ("Didelphimorphia") affinities. |
format |
Objeto de conferencia Resumen |
author |
Forasiepi, Analía Goin, Francisco Javier Sigé, Bernard Cerdeño Serrano, María Esperanza |
author_facet |
Forasiepi, Analía Goin, Francisco Javier Sigé, Bernard Cerdeño Serrano, María Esperanza |
author_sort |
Forasiepi, Analía |
title |
A new insectivoran-like metatherian from western Argentina (Quebrada Fiera, Mendoza Province, Deseadan Age, late Oligocene) |
title_short |
A new insectivoran-like metatherian from western Argentina (Quebrada Fiera, Mendoza Province, Deseadan Age, late Oligocene) |
title_full |
A new insectivoran-like metatherian from western Argentina (Quebrada Fiera, Mendoza Province, Deseadan Age, late Oligocene) |
title_fullStr |
A new insectivoran-like metatherian from western Argentina (Quebrada Fiera, Mendoza Province, Deseadan Age, late Oligocene) |
title_full_unstemmed |
A new insectivoran-like metatherian from western Argentina (Quebrada Fiera, Mendoza Province, Deseadan Age, late Oligocene) |
title_sort |
new insectivoran-like metatherian from western argentina (quebrada fiera, mendoza province, deseadan age, late oligocene) |
publishDate |
2010 |
url |
http://sedici.unlp.edu.ar/handle/10915/16674 |
work_keys_str_mv |
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bdutipo_str |
Repositorios |
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1764820463270232064 |