Systematics, phylogeny and evolutionary pattern of the hystricognath rodent <i>Eumysops</i> (Echimyidae) from the Plio–Pleistocene of southern South America

†<i>Eumysops</i> is a peculiar representative of the currently tropical family Echimyidae, which evolved in increasingly dry and cold Plio–Pleistocene environments of southern South America. The results of a systematic and stratigraphic review of the genus, and of phylogenetic analyses b...

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Detalles Bibliográficos
Autores principales: Olivares, Adriana Itatí, Verzi, Diego Héctor
Formato: Articulo
Lenguaje:Inglés
Publicado: 2015
Materias:
Ciencias Naturales
Zoología
Rodentia
caviomorph
Echimyidae
phylogeny
Plio–Pleistocene
2.5-Ma palaeoclimatic event
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/147649
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-147649
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
Zoología
Rodentia
caviomorph
Echimyidae
phylogeny
Plio–Pleistocene
2.5-Ma palaeoclimatic event
spellingShingle Ciencias Naturales
Zoología
Rodentia
caviomorph
Echimyidae
phylogeny
Plio–Pleistocene
2.5-Ma palaeoclimatic event
Olivares, Adriana Itatí
Verzi, Diego Héctor
Systematics, phylogeny and evolutionary pattern of the hystricognath rodent <i>Eumysops</i> (Echimyidae) from the Plio–Pleistocene of southern South America
topic_facet Ciencias Naturales
Zoología
Rodentia
caviomorph
Echimyidae
phylogeny
Plio–Pleistocene
2.5-Ma palaeoclimatic event
description †<i>Eumysops</i> is a peculiar representative of the currently tropical family Echimyidae, which evolved in increasingly dry and cold Plio–Pleistocene environments of southern South America. The results of a systematic and stratigraphic review of the genus, and of phylogenetic analyses based on both morphology and a combined morphological–molecular dataset in the context of extant representatives, are presented here. Recognised diversity includes four previously described species plus a new one from the late Pliocene. These species form a well-supported monophyletic clade, sister to the late Miocene †<i>Pampamys</i> and the extant <i>Thrichomys</i>. The position of †<i>Eumysops</i>–†<i>Pampamys</i>–<i>Thrichomys</i> in a major clade including non-‘eumysopine’ echimyids constrains the traditional taxon Eumysopinae only to these three genera. Phylogeny and stratigraphic distribution of †<i>Eumysops</i> species suggest an essentially cladogenetic evolutionary pattern. Beyond this, a gradual directional change, involving increase in size and in molar hypsodonty, is shown by †<i>Eumysops chapalmalensis</i> as part of a late Pliocene faunal turnover interpreted as a local representation of the 2.5-Ma cooling global event. Distinctive skeletal and dental anatomy of †<i>Eumysops</i>, including large orbits, shortened braincase, marked hypsodonty and postcranial specialisations, would be a result of its southern history related to a particular palaeoclimatic context.
format Articulo
Articulo
author Olivares, Adriana Itatí
Verzi, Diego Héctor
author_facet Olivares, Adriana Itatí
Verzi, Diego Héctor
author_sort Olivares, Adriana Itatí
title Systematics, phylogeny and evolutionary pattern of the hystricognath rodent <i>Eumysops</i> (Echimyidae) from the Plio–Pleistocene of southern South America
title_short Systematics, phylogeny and evolutionary pattern of the hystricognath rodent <i>Eumysops</i> (Echimyidae) from the Plio–Pleistocene of southern South America
title_full Systematics, phylogeny and evolutionary pattern of the hystricognath rodent <i>Eumysops</i> (Echimyidae) from the Plio–Pleistocene of southern South America
title_fullStr Systematics, phylogeny and evolutionary pattern of the hystricognath rodent <i>Eumysops</i> (Echimyidae) from the Plio–Pleistocene of southern South America
title_full_unstemmed Systematics, phylogeny and evolutionary pattern of the hystricognath rodent <i>Eumysops</i> (Echimyidae) from the Plio–Pleistocene of southern South America
title_sort systematics, phylogeny and evolutionary pattern of the hystricognath rodent <i>eumysops</i> (echimyidae) from the plio–pleistocene of southern south america
publishDate 2015
url http://sedici.unlp.edu.ar/handle/10915/147649
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