Genetica

, Volume 61, Issue 1, pp 13–20

Chromosome relationships in three representatives of the genusHolochilus (Rodentia, Cricetidae) from Brazil

  • T. R. O. Freitas
  • M. S. Mattevi
  • L. F. B. Oliveira
  • M. J. Souza
  • V. Vonenaga-Vassuda
  • F. M. Salzano
Article

Abstract

The G- and C-banded karyotype ofHolochilus brasiliensis collected in central Brazil (2n=55, AN=56, acrocentric X and Y) can be regarded as the most representative of the ancestral form of the genus.H. magnus (2n=52, AN=58, acrocentric X and Y) andH. brasiliensis vulpinus (2n=40, AN=56), both living in southern Brazil, would be in different phases of chromosome number reduction due to centric fusions.H. magnus, in addition, shows an X of variable morphology and a metacentric Y. This fact, coupled with its distinct morphology and restricted distribution, suggests that it may represent a distinct trend in the genus' main evolutionary line.

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Copyright information

© Dr W. Junk Publishers 1983

Authors and Affiliations

  • T. R. O. Freitas
    • 1
  • M. S. Mattevi
    • 2
  • L. F. B. Oliveira
    • 2
  • M. J. Souza
    • 3
  • V. Vonenaga-Vassuda
    • 4
  • F. M. Salzano
    • 3
  1. 1.Departamento de Zoologia & Genética, Instituto de BiologiaUniversidade Federal de PelotasPelotasBrazil
  2. 2.Departamento de Genética, Instituto de BiociênciasUniversidade Federal do Rio Grande do SulPorto AlegreBrazil
  3. 3.Departamento de Biologia Geral, Centro de Ciências BiológicasUniversidade Federal de PernambucaRecifeBrazil
  4. 4.Departamento de Biologia, Instituto de BiociênciasUniversidade de São PauloSão PauloBrazil
  5. 5.Departamento de Genética, Instituto de BiociênciasUFRGSPorto AlegreBrazil

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