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: Forasiepi, Analía, Goin, Francisco Javier, Sigé, Bernard, Cerdeño Serrano, María Esperanza
Formato: Objeto de conferencia Resumen
Lenguaje:Inglés
Publicado: 2010
Materias:
Ciencias Naturales
Paleontología
Insectivoran
Metatherian
Argentina
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/16674
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-16674
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
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
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