Abstract
Karyotypes of seven hemiodid fish species have a similar macrostructure, with 2n=54 and FN=108. The chromosome types range from 24 to 25 M-SM chromosome pairs and from 2 to 3 ST chromosome pairs. The species differ in the karyotypic formulae and the NORs are located on a single pair of ST or SM chromosomes. The results are compared with other characiforms, especially those with a similar karyotypic macrostructures, in order to evaluate the possible derivations of the chromosomal patterns of the group.
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