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First cytogenetic studies of the genus Heptapterus (Actinopterygii, Siluriformes): karyotype differentiation and review of cytogenetic data on the Heptapteridae family

Authors

  • C. F. Yano,

    1. Centro de Ciências Biológicas e da Saúde, Universidade Estadual do Oeste do Paraná, 85819-110, Rua Universitária 2069, Cascavel, PR, Brazil
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  • V. P. Margarido

    Corresponding author
    1. Centro de Ciências Biológicas e da Saúde, Universidade Estadual do Oeste do Paraná, 85819-110, Rua Universitária 2069, Cascavel, PR, Brazil
      Tel.: +55 45 3220 3235; email: Vladimir.Margarido@unioeste.br
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Tel.: +55 45 3220 3235; email: Vladimir.Margarido@unioeste.br

Abstract

The Neotropical fish Heptapterus mustelinus, collected in the Pindorama stream of the upper Paraná River basin (Brazil), was studied cytogenetically, verifying 54 chromosomes (26m + 18m + 4st + 6a). This diploid number has not been reported among the Heptapteridae that have been studied to date. Unlike most species of the family, there were multiple Ag-nucleolar organizer regions (NOR) and heterochromatin present in the centromeric region of most of the chromosomes of the complement, being Chromomycin A3 (CMA3+)/4′,6-diamidino-2-phenylindole (DAPI) in nine chromosomal pairs, besides the one that coincides with the Ag-NORs. The data presented in this work reveal a different path in the karyotypic evolution of H. mustelinus when compared to the others Heptapteridae genera.

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