Maistro, E. L. [UNESP]Foresti, F. [UNESP]Oliveira, C. [UNESP]2014-05-272014-05-271994-01-01Brazilian Journal of Genetics, v. 17, n. 2, p. 153-156, 1994.0100-8455http://hdl.handle.net/11449/64449Cytogenetic studies performed on 17 specimens (11 females and six males) of Astyanax scabripinnis paranae from the Cascatinha stream showed that this population has 2n = 50 chromosomes (8M + 22SM + 10ST + 10A), two chromosome pairs with NORs and conspicuous C-band positive blocks in the terminal position of the long arm of five chromosome pairs. Three females presented 2n = 51 chromosomes and the extra chromosome was a large metacentric similar in size and morphology to the first chromosome pair in the karyotype. This accessory chromosome was entirely heterochromatic in C-banded metaphases, which permitted its classification as a supernumerary chromosome. Some aspects related to the morphology of such macro B-chromosomes are discussed.153-156enganimal cellchromosome analysisfemalefishkaryotypemalenonhumansupernumerary chromosomeArtigoAcesso aberto2-s2.0-00280248622-s2.0-0028024862.pdf0804793944846367