Chromosome relationships in three representatives of the genusHolochilus (Rodentia,Cricetidae) from Brazil |
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| Authors: | T R O Freitas M S Mattevi L F B Oliveira M J Souza V Vonenaga-Vassuda F M Salzano |
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| Institution: | (1) Departamento de Zoologia & Genética, Instituto de Biologia, Universidade Federal de Pelotas, Pelotas, RS, Brazil;(2) Departamento de Genética, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil;(3) Departamento de Biologia Geral, Centro de Ciências Biológicas, Universidade Federal de Pernambuca, Recife, PE, Brazil;(4) Departamento de Biologia, Instituto de Biociências, Universidade de São Paulo, São Paulo, SP, Brazil;(5) Departamento de Genética, Instituto de Biociências, UFRGS, Ciaxa Postal 1953, 90000 Porto Alegre, RS, Brazil |
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| 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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