2011/02/01 by Ana Lazar Gomes e Souza, Margaret Maria de Oliveira Corrêa, Cecilia Teixeira de Aguilar +1 · 1 citation
Agricultural and Biological Sciences · Earth and Planetary Sciences · Biochemistry, Genetics and Molecular Biology · #Chromosomal and Genetic Variations #Evolution and Paleontology Studies #Genetic diversity and population structure #Karyotype #Biology #Sigmodontinae #Ploidy #Zoology #Centromere #Chromosome #Population #Phylogenetic tree #Genetics #Ecology #Rodent #Demography
paper · pdf · doi:10.1590/s1984-46702011000100013
openalex publication_date 2011/02/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/19
A new karyotype of Wiedomys pyrrhorhinus (Wied, 1821) is described, including G- and C-banding and Ag-NOR sites from specimens collected in the municipality of Morro do Chapéu, situated in the northern region of the Chapada Diamantina, state of Bahia. Karyological studies of W. pyrrhorhinus have shown a constant diploid number (2n) of 62 with two different numbers of autosomal arms (FNa): 86 and 90, respectively. The new karyotype revealed 2n = 62 and FNa = 104, being the higher autosomal number found so far for this genus. The X chromosome is a large acrocentric and the Y chromosome is a small acrocentric. The analysis of the karyotype morphology suggests that this new karyotype is more closely related to the previous karyotype with 2n = 62 and FNa = 90, described from Caetité, Bahia State. Further studies, comparing different populations of W. pyrrhorhinus, including molecular approaches, may help to better understand the geographical limits of each population and their phylogenetic relationships in the Caatinga biome