Abstract
Abstract A comparative cytogenetic analysis was carried out in two sympatric fish species of the genus Characidium, C. gomesi and C. cf. zebra, from the Parana basin, Sao Paulo State, Brazil. Although both species showed the same diploid number (2n = 50) and a similar karyotypic macrostructure, an interspecific diversity was detected concerning the distribution of the C-bands and the nucleolar organizing regions in the karyotypes, as well as the sex chromosomes. A ZZ/ZW sex chromosome system was detected in C. gomesi, where the W chromosome appears fully heterochromatic and with a small size than Z chromosome. This species also presented a triploid female specimen bearing one W and two Z chromosomes. In C. cf.zebra heteromorphic sex chromosomes were not found. These data are discussed concerning the characterization of the regional ictiofauna and its evolutionary aspects.
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