Article
Species groups and the evolutionary diversification of tuco-tucos, genus Ctenomys (Rodentia: Ctenomyidae)
Registro en:
PARADA, Andrés; et al. Species groups and the evolutionary diversification of tuco-tucos, genus Ctenomys (Rodentia: Ctenomyidae). Journal of Mammalogy, v.92, n.3, p.671–682, 2011.
1545-1542
0022-2372
Autor
Parada, Andrés
D`Elia, Guillermo
Bidau, Claudio J.
Lessa, Enrique P.
Resumen
We present the most comprehensive study to date of species groups in Ctenomys (tuco-tucos), a species-rich
genus of Neotropical rodents. To explore phylogenetic relationships among 38 species and 12 undescribed
forms we sequenced the complete mitochondrial cytochrome-b genes of 34 specimens and incorporated 50
previously published sequences. Parsimony, likelihood, and Bayesian phylogenetic analyses were performed
using additional hystricognath rodents as outgroup taxa. The basal dichotomy of Ctenomys splits C. sociabilis
from the remaining tuco-tucos, within which 8 main species groups were identified: boliviensis, frater,
mendocinus, opimus, magellanicus, talarum, torquatus, and tucumanus. Whereas most of these groups refer to
previous clades proposed on the basis of chromosomes or morphology, the torquatus and magellanicus species
groups are novel taxonomic hypotheses. However, relationships among species groups are poorly resolved.
Furthmore, the positions of C. leucodon, C. maulinus, and C. tuconax are conflicting or unresolved, and they
might represent additional independent lineages. On the basis of molecular dating, we estimate that most
species groups originated approximately 3 million years ago. 2030-01-01