Acta Theriologica

, Volume 49, Issue 2, pp 181–190 | Cite as

Karyologic diversification and phylogenetic relationships of the genusThalpomys (Rodentia, Sigmodontinae)

  • Ana F. B. de Andrade
  • Cibele R. Bonvicino
  • Denis C. Briani
  • Sanae Kasahara


We describe the karyotype ofThalpomys species, from different Brazilian localities of the Cerrado.Thalpomys cerradensis Herskovitz, 1990 showed 2n=36, FN=34 andT. 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 genusThalpomys but was not capable of elucidating its phylogenetic relationship to other Akodontini rodents. These analyses also showed inter-individual variation inT. lasiotis, even within a given population. Phylogenetic analyses placedT. lasiotis specimens with different karyotypes in different monophyletic branches. Molecular and karyologic data confirmed the identity of the genusThalpomys.


Rodentia Thalpomys karyotype phylogeny distribution Brazil 


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Copyright information

© Mammal Research Institute, Bialowieza, Poland 2004

Authors and Affiliations

  • Ana F. B. de Andrade
    • 1
    • 2
    • 3
  • Cibele R. Bonvicino
    • 2
    • 5
  • Denis C. Briani
    • 4
  • Sanae Kasahara
    • 5
  1. 1.Dept of BiologyUniversidade Estadual Paulista, UNESPRio ClaroBrazil
  2. 2.Genetics DivisionInstituto Nacional de CâncerRio de JaneiroBrazil
  3. 3.Post Graduation in Cellular and Molecular BiologyIOC-FIOCRUZRio de Janeiro
  4. 4.Dept of ZoologyUniversidade Estadual Paulista- UNESPRio ClaroBrazil
  5. 5.Dept of Tropical MedicineIOC-FIOCRUZRio de JaneiroBrazil

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