Oliveira, C.Almeidatoledo, L. F.Mori, L.Toledo, S. A.2014-05-202014-05-201993-04-01Caryologia. Florence: Univ Florence Botany Inst, v. 46, n. 2-3, p. 171-188, 1993.0008-7114http://hdl.handle.net/11449/37716Cytogenetic studies involving conventional Giemsa staining, C-banding analysis and silver staining of NORs were performed on nine species belonging to six genera of the family Callichthyidae. The diploid number ranged from 2n = 44 to 2n = 100, the number of chromosomal pairs with NORs ranged from 1 to 4 and constitutive heterochromatin was mainly distributed in the centromeric and/or pericentromeric position of the chromosomes. The DNA content of erythrocytes from six species studied ranged from 1.18 +/- 0.07 to 2.77 +/- 0.22 pg/nucleus. The extensive variability in karyotypes and in nuclear DNA content detected are in accordance with the initial hypothesis that chromosome rearrangements and polyploidy have played a significant role in the evolutionary history of Callichthyidae.171-188engCALLICHTHYIDAEKARYOTYPENORC-BANDDNA CONTENTArtigoWOS:A1993MH88400009Acesso restrito