A new species of Wiedomys (Rodentia: Sigmodontinae) from Brazilian Cerrad

The presence of Wilfredomys oenax (Rodentia: Cricetidae: Sigmodontinae) in São Paulo state, southeastern Brazil: a locally extinct species?

“…Although the phylogenetic position of these three genera remains unresolved, or at least controversial (see Reig, 1980;Pacheco, 2003;D'Elía et al, 2007;Ventura et al, 2013), some advances on Wiedomys and Juliomys were obtained, including new species (Oliveira & Bonvicino, 2002;Gonçalves et al, 2005;Costa et al, 2007) and new records (Pavan & Leite, 2011;Fonseca et al, 2013). Conversely, Wilfredomys Ávila-Pires (1960) and Pine (1980).…”

Karyotype composition of some rodents and marsupials from Chapada Diamantina (Bahia, Brasil)

“…The individual here analyzed presented chromosome complement similar to W. pyrrorhinus, but presented also the alisphenoid strut (W. cerradensis). This already happened in two individuals (one from Caruaru and other from Santana de Ipanema) (Gonçalves et al, 2005), in this case as well as here, the identification of these specimens is based on cytogenetic data.…”

“…The X chromosome corresponds to the largest acrocentric autosome in size and the Y is a small one. Gonçalves et al (2005) studied the genus Wiedomys with morphological, chromosomic and molecular data and described another species (W. cerradensis (Gonçalves et al, 2005)). They identified differences in chromosomal complement (2n = 60 and NA = 88) and morphological characters (presence of alisphenoid strut).…”

“…Morphological characters (skin and skull) were considered for species identification in comparison to previous descriptions for Didelphimorphia (Emmons and Feer, 1997;Lange and Jablonski, 1998;Mustrangi and Patton, 1997) and Rodentia (Emmons and Feer, 1997;Geise, 1995;Gonçalves et al, 2005;Langguth and Bonvicino 2002;Tribe, 1996;Weksler, 1996). Specific names followed Wilson and Reeder (2005), when a more recent account was not available.…”

Small mammals (Chiroptera, Didelphimorphia, and Rodentia) from Jaíba, middle Rio São Francisco, northern Minas Gerais State, Brazil

“…FIELD NOTES: captured at Mata da Agroceres, Areas A, F, and C2, at Fazenda Serra Azul, and at the borders of Lagoa do (MN 34433,34434,34436,43814,43815,and 43816), revealing a diploid number (2n) varying between 50 and 52, but with a constant fundamental number (FN) ¼ 62. This variability is due to 6.7 (6.6-6.8) The longer molar toothrow, the broader incisive foramina, and the lack of the alisphenoid strut in the specimens from Jaíba conform to the recognized distinctive characters of W. pyrrhorhinos with respect to W. cerradensis, a species described from Jaborandi, Bahia, by Gonc¸alves et al (2005).…”