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The karyotypic study of 33 specimens of geographic isolated populations of Trichomycterus paolence (Eigenmann 1918) collected from three brook streams revealed a modal diploid number of 54 and three different chromosomal formula : 44 metacentrics (M) +8 submetacentrics (SM) +2 subtelocentrics (ST), 40 metacentrics (M) +14 submetacentrics (SM), and 46 metacentrics (M) +6 submetacentrics (SM) +2 subtelocentrics (ST). The nucleolar organizer regions (NORs) were interstitially located on the long arms of the same largest submetacentric chromosome pair in the karyotypes in two of three samples analyzed; in the third sample, the NORs were also interstitially located on the long arm as well, but in the largest metacentric pair of chromosomes. C-banding analysis showed centromeric and pericentromeric patterns of DNA heterochromatinization only in a few chromosome pairs in all three populations analysed. Differences in chromosome and karyotype organization among the individuals can constitute interesting markers for specific populations and play its role in the process of diversification within this group.

cytologia

Comparative Cytogenetic Studies in Alopatric Populations of Trichomycterus paolence Eigenmann, 1918 from Southeastern Brazil (Siluriformes, Trichomycteridae).