Occurrence of B chromosomes in Cyphocharax modestus (Fernández-Yépez, 1948) and Steindachnerina insculpta (Fernández-Yépez, 1948)(Characiformes, Curimatidae) from the Tibagi River basin (Paraná State, Brazil)

Brazilian Journal of Biology

W. Gravena²  R. Teribele¹  L. Giuliano-caetano²  Al. Dias² 

[1] ,Universidade Estadual de Londrina CCB Departamento de Biologia GeralLondrina PR ,Brazil

关键词: supernumerary chromosomes;    karyotype;    C-banding;    fish populations;    cromossomos supranumerários;    cariótipo;    bandamento C;    populações de peixes;   

DOI  :  10.1590/S1519-69842007000500014

来源: SciELO

【 摘 要 】

We cytogenetically analyzed 18 individuals of Cyphocharax modestus, and 41 individuals of Steindachnerina insculpta from the Tibagi River basin (Paraná State, Brazil). All the specimens had 2n = 54 chromosomes, all meta-submetacentric (M-SM). The presence of 1 or 2 B chromosomes was seen in some individuals of C. modestus of the two sampled populations, showing inter- and intra individual variation. In S. insculpta, B chromosomes were also observed but only in one population, also showing inter- and intra individual variation. C-banding was used to show that the identified B chromosomes were totally heterochromatic in the two examined species.

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