Artículo
A new Pleistocene Ctenomys and divergence dating of the hyperdiverse South American rodent family Ctenomyidae
de Santi, Nahuel Antu
; Verzi, Diego Hector
; Olivares, Adriana Itati
; Piñero García, Pedro
; Alvarez, Alicia
; Morgan, Cecilia Clara
Fecha de publicación:
05/2021
Editorial:
Cambridge University Press
Revista:
Journal of Systematic Palaeontology
ISSN:
1477-2019
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
The South American Ctenomys is the most speciose genus among both hystricomorphs and subterranean rodents of the world. Here, we present the most exhaustive phylogenies and timetree of living and extinct Ctenomys attempted thus far. We describe Ctenomys rusconii sp. nov., a small-sized species from the upper Early Pleistocene of central Argentina. We analyse its cranial and mandibular shape as well as its phylogenetic position in the context of other extinct Ctenomys and a wide sample of living species. A parsimony analysis shows that Ctenomys rusconii sp. nov. integrates the stem group of Ctenomys together with late Pliocene to Middle Pleistocene species, while the crown group comprises only Middle Pleistocene to recent representatives. Within the crown Ctenomys, nine well-supported major clades were recovered, eight of which are consistent with previously recognized extant species groups. A Bayesian tipdating analysis provided divergence age estimates of 3.8Ma and 1.3Ma for the origin of the genus and the crown clade, respectively. Remarkably, the extinct species recovered as members of the crown clade, i.e. C. dasseni, C. kraglievichi, C. subassentiens and C. viarapaensis, were clustered into the earliest diverging clade corresponding to the frater species group. Age estimates for the divergence of the crown and its major clades are markedly younger than what has been generally considered so far, which implies a new view on the timing of taxonomic, ecological and geographical diversification of the genus. Even considering that this interpretation is affected by biases inherent to the fossil record, the phylogenetic delimitation of the crown clade as restricted to species recorded since the Middle Pleistocene seems to configure a pattern underlain by a fast and late cladogenesis.
Palabras clave:
CTENOMYIDAE
,
SOUTH AMERICA
,
PLEISTOCENE
,
PHYLOGENY
,
TIMETREE
Archivos asociados
Licencia
Identificadores
Colecciones
Articulos(INECOA)
Articulos de INSTITUTO DE ECORREGIONES ANDINAS
Articulos de INSTITUTO DE ECORREGIONES ANDINAS
Citación
de Santi, Nahuel Antu; Verzi, Diego Hector; Olivares, Adriana Itati; Piñero García, Pedro; Alvarez, Alicia; et al.; A new Pleistocene Ctenomys and divergence dating of the hyperdiverse South American rodent family Ctenomyidae; Cambridge University Press; Journal of Systematic Palaeontology; 19; 5-2021; 377-392
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