A new Echimyidae (Rodentia, Hystricomorpha) from the late Miocene of southern South America

A new genus of echimyid rodent, yUllumys, from the uppermost Miocene of northwestern Argentina is described. It includes two species, yU. pattoni, sp. nov., and yUllumys intermedius, nov. comb. yUllumys pattoni is known from a skull fragment and the corresponding right hemimandible coming from level...

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Autores principales: Olivares, Adriana Itatí, Verzi, Diego Héctor, Contreras, Víctor H., Pessóa, Leila M.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2017
Materias:
Ciencias Naturales
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/146894
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-146894
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
spellingShingle Ciencias Naturales
Olivares, Adriana Itatí
Verzi, Diego Héctor
Contreras, Víctor H.
Pessóa, Leila M.
A new Echimyidae (Rodentia, Hystricomorpha) from the late Miocene of southern South America
topic_facet Ciencias Naturales
description A new genus of echimyid rodent, yUllumys, from the uppermost Miocene of northwestern Argentina is described. It includes two species, yU. pattoni, sp. nov., and yUllumys intermedius, nov. comb. yUllumys pattoni is known from a skull fragment and the corresponding right hemimandible coming from levels of Loma de Las Tapias Formation, underlying a tuff dated at 7.0 § 0.9 Ma (Huayquerian age, San Juan Province). yUllumys intermedius is represented by a left hemimandible from the ‘Araucanense’ of Valle de Santa Mar ıa (Huayquerian age, Catamarca Province). A phylogenetic analysis in the context of octodontoids linked yUllumys to the clade subtended by the extinct echimyids yPampamys and yEumysops and the living Thrichomys. yUllumys has a peculiar craniomandibular morphology, shared only with yEumysops among the Octodontoidea, involving specializations to open environments such as large and posteriorly extended orbits and related low mandibular condyles. Phylogenetic relationships of yUllumys support the hypothesis that echimyids recorded since the latest Miocene in southern South America, and linked to those currently inhabiting Brazilian open biomes, represent a marginal sample of the great diversity evolving primarily in northern tropical areas
format Articulo
Articulo
author Olivares, Adriana Itatí
Verzi, Diego Héctor
Contreras, Víctor H.
Pessóa, Leila M.
author_facet Olivares, Adriana Itatí
Verzi, Diego Héctor
Contreras, Víctor H.
Pessóa, Leila M.
author_sort Olivares, Adriana Itatí
title A new Echimyidae (Rodentia, Hystricomorpha) from the late Miocene of southern South America
title_short A new Echimyidae (Rodentia, Hystricomorpha) from the late Miocene of southern South America
title_full A new Echimyidae (Rodentia, Hystricomorpha) from the late Miocene of southern South America
title_fullStr A new Echimyidae (Rodentia, Hystricomorpha) from the late Miocene of southern South America
title_full_unstemmed A new Echimyidae (Rodentia, Hystricomorpha) from the late Miocene of southern South America
title_sort new echimyidae (rodentia, hystricomorpha) from the late miocene of southern south america
publishDate 2017
url http://sedici.unlp.edu.ar/handle/10915/146894
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