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...
| Autores principales: | , |
|---|---|
| Formato: | Articulo |
| Lenguaje: | Inglés |
| Publicado: |
2015
|
| Materias: | |
| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/147649 |
| Aporte de: |
| 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 |
| work_keys_str_mv |
AT olivaresadrianaitati systematicsphylogenyandevolutionarypatternofthehystricognathrodentieumysopsiechimyidaefromthepliopleistoceneofsouthernsouthamerica AT verzidiegohector systematicsphylogenyandevolutionarypatternofthehystricognathrodentieumysopsiechimyidaefromthepliopleistoceneofsouthernsouthamerica |
| bdutipo_str |
Repositorios |
| _version_ |
1764820461625016321 |