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Please use this identifier to cite or link to this item: http://acervodigital.unesp.br/handle/11449/132329
Title: 
Karyologic diversification and phylogenetic relationships of the genus Thalpomys (Rodentia, Sigmodontinae)
Author(s): 
Institution: 
  • Universidade Estadual Paulista (UNESP)
  • Instituto Nacional de Câncer
  • IOC-FIOCRUZ
ISSN: 
0001-7051
Abstract: 
We describe the karyotype of Thalpomys species, from different Brazilian localities of the Cerrado. Thalpomys cerradensis Herskovitz, 1990 showed 2n = 36, FN = 34 and T. lasiotis Thomas, 1916 2n = 38, FN = 38. Comparisons of G-band karyotypes showed evident inter-specific homologies indicating that their chromosome complements could be derived from one another by two presumed rearrangements. Both species showed pericentromeric C-band regions in almost all chromosomes but a comparison with CMA3/DA/DAPI staining indicated that the molecular content of heterochromatic regions was different. T. lasiotis specimens from two different localities differed in the morphology of the X chromosome due to the presence of a short heterochromatic arm. These chromosome types are apparently fixed in each population rather than maintained as a polymorphic variation. Phylogenetic analyses supported the monophyly of the genus Thalpomys but was not capable of elucidating its phylogenetic relationship to other Akodontini rodents. These analyses also showed inter-individual variation in T. lasiotis, even within a given population. Phylogenetic analyses placed T. lasiotis specimens with different karyotypes in different monophyletic branches. Molecular and karyologic data confirmed the identity of the genus Thalpomys.
Issue Date: 
1-Jun-2004
Citation: 
Acta Theriologica, v. 49, n. 2, p. 181-190, 2004.
Time Duration: 
181-190
Publisher: 
Springer
Keywords: 
  • Brazil
  • Distribution
  • Karyotype
  • Phylogeny
  • Rodentia
  • Thalpomys
  • Karyotype
  • Phylogenetics
  • Rodent
  • South America
  • Sigmodontinae
  • Thalpomys cerradensis
  • Thalpomys lasiotis
Source: 
http://dx.doi.org/10.1007/BF03192519
URI: 
Access Rights: 
Acesso restrito
Type: 
outro
Source:
http://repositorio.unesp.br/handle/11449/132329
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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