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First cytogenetic studies of the genus Heptapterus (Actinopterygii, Siluriformes): karyotype differentiation and review of cytogenetic data on the Heptapteridae family
Author(s) -
Yano C. F.,
Margarido V. P.
Publication year - 2012
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.2012.03314.x
Subject(s) - actinopterygii , biology , karyotype , genus , zoology , perciformes , evolutionary biology , cytogenetics , fish <actinopterygii> , genetics , chromosome , fishery , gene
The Neotropical fish Heptapterus mustelinus , collected in the Pindorama stream of the upper Paraná River basin (Brazil), was studied cytogenetically, verifying 54 chromosomes (26 m + 18 m + 4 st + 6 a ). 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 A 3 (CMA 3 + )/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.