Article
Scapteromys aquaticus (Rodentia: Sigmodontinae) in Brazil with comments on karyotype and phylogenetics relationships
Registro en:
BONVICINO, Cibele R.; et al. Scapteromys aquaticus (Rodentia: Sigmodontinae) in Brazil with comments on karyotype and phylogenetics relationships. Zoologia, v.30, n.2, p.242–247, April 2013.
1984-4670
10.1590/S1984-46702013000200016
Autor
Bonvicino, Cibele R.
Fernandes, Fabiano A.
Viana, Maria C.
Teixeira, Bernardo R.
D'Andrea, Paulo S.
Resumen
The swamp rats are distributed in Argentina, southern Paraguay, Uruguay and southern Brazil, with two species
currently accepted: Scapteromys aquaticus Thomas, 1920 and Scapteromys tumidus Waterhouse, 1837. While S. aquaticus
occurs in Argentina, Paraguay and western Uruguay, S. tumidus occurs in Brazil and Uruguay. Here we report for the first
time the occurrence of S. aquaticus in gallery forest remnants in Southern Brazil. Karyologic analysis showed 2n = 32 and
FNa = 40. Phylogenetic analyses, based on DNA sequences from the mitochondrial cytochrome-b gene indicate that the
Brazilian and the Argentinian specimens of S. aquaticus shared one haplotype, while median joining analysis showed lack
of population structure. This register, plus the karyotype data available for Brazilian population, recovered four
karyomorphotypes in Brazil, corresponding to the two known species of Scapteromys and two unnamed species. This
scenario indicates that more multidisciplinary studies are necessary to understand the actual diversity of Scapteromys.