Chromosomal Diversity in Scorpaenidae (Teleostei, Scorpaeniformes) : Cytogenetic Studies in Scorpaena brasiliensis and Scorpaena isthmensis from the Coast of Rio de Janeiro, Brazil
1997 年 62 巻 4 号 p. 397-404
詳細
1997 年 62 巻 4 号 p. 397-404
Two Scorpaniform species (Scorpaena brasiliensis and S. isthmensis) from the coast of Rio de Janeiro (Brazil), were cytogenetically analyzed by Giemsa staining, silver nitrate and mithramycin A staining, and C-banding. S. brasiliensis showed 2n=46 and FN= 60 and S. isthmensis showed 2n=40 and FN= 54. The NORs were located in the telomeric regions of the short arms of a submetacentric chromosome (pair 5 in S. isthmensis and pair 2 in S. brasiliensis). Size NOR heteromorphism was detected in S. brasiliensis. The constitutive heterochromatin patterns revealed the presence of small centromeric segments in almost all chromosomes in both species. In S. brasiliensis a conspicuous block was also observed in the NOR sites. The karyotypes described in this study show a significant chromosome divergence, mainly due to centric fusions and pericentric inversions.
