Abstract
Rhagomys rufescens (Rodentia: Sigmodontinae) is an endemic species of the Atlantic forest from Southern and Southeastern Brazil. Some authors consider Rhagomys as part of the tribe Thomasomyini; but its phylogenetic relationships remain unclear. Chromosomal studies on eight specimens of Rhagomys rufescens revealed a diploid number of 2n = 36 and a number of autosome arms FN = 50. GTG, CBG and Ag-NOR banding and CMA3 /DAPI staining were performed on metaphase chromosomes. Eight biarmed and nine acrocentric pairs were found in the karyotype of this species. The X and Y chromosomes were both acrocentric. Most of the autosomes and the sex chromosomes showed positive C-bands in the pericentromeric region. The X chromosome showed an additional heterochromatic block in the proximal region of the long arm. Nucleolus organizer regions (NORs) were located in the pericentromeric region of three biarmed autosomes (pairs 4, 6 and 8) and in the telomeric region of the short arm of three acrocentrics (pairs 10, 12 and 17). CMA 3 /DAPI staining produced fluorescent signals in many autosomes, especially in pairs 4, 6, and 8. This study presents cytogenetic data of Rhagomys rufescens for the first time.
Highlights
Rhagomys rufescens (Rodentia: Sigmodontinae) is an endemic species of the Atlantic forest from Southern and Southeastern Brazil
Rhagomys rufescens was originally described as Hesperomys rufescens, based on a female collected in Rio de Janeiro, southeastern Brazil
In the beginning of the 20th century, Thomas collected another specimen from an unknown locality, which was used for the description of the genus Rhagomys (Thomas 1917) (Percequillo et al, 2004)
Summary
André Filipe Testoni, Sérgio Luiz Althoff, André Paulo Nascimento, Francisco Steiner-Souza and Ives José Sbalqueiro. Laboratório de Citogenética Animal, Departamento de Genética, Universidade Federal do Paraná,Curitiba, PR, Brazil. Laboratório de Biologia Animal, Departamento de Ciências Naturais, Fundação Universidade Regional de Blumenau, Blumenau, SC, Brazil. Laboratório de Genética, Departamento de Ciências Naturais, Programa de Pós-Graduação em Biologia Animal, Departamento de Zoologia, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil. Programa de Pós-Graduação em Genética, Departamento de Genética, Universidade Federal do Paraná, Curitiba, PR, Brazil
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