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http://acervodigital.unesp.br/handle/11449/132329
- Title:
- Karyologic diversification and phylogenetic relationships of the genus Thalpomys (Rodentia, Sigmodontinae)
- Universidade Estadual Paulista (UNESP)
- Instituto Nacional de Câncer
- IOC-FIOCRUZ
- 0001-7051
- 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.
- 1-Jun-2004
- Acta Theriologica, v. 49, n. 2, p. 181-190, 2004.
- 181-190
- Springer
- Brazil
- Distribution
- Karyotype
- Phylogeny
- Rodentia
- Thalpomys
- Karyotype
- Phylogenetics
- Rodent
- South America
- Sigmodontinae
- Thalpomys cerradensis
- Thalpomys lasiotis
- http://dx.doi.org/10.1007/BF03192519
- Acesso restrito
- outro
- http://repositorio.unesp.br/handle/11449/132329
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