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Comparative cytogenetic study of the armored catfishes of the genus Hoplosternum (Siluriformes, Callichthyidae)

Jorge Ivan Rebelo Porto; Eliana Feldberg

Instituto Nacional de Pesquisas da Amazônia, Coordenação de Pesquisas em Biologia Aquática, Laboratório de Genética de Peixes, 69083 Manaus, AM, Brasil

ABSTRACT

Karyotypes of two Hoplosternum species revealed dissimilar chromosome complements consisting of 2n-60/FN-68 in H. littorale and 2n-64/FN-84 in II. thoracatum. The nucleolar organizer regions (NORs) were characteristic for each species. We suggest that these karyotypic differences are due to pericentric inversions and Robertsonian rearrangements. The results are compared with those of callichthyid karyotypes in order to evaluate the possible derivations of the chromosomal patterns of Hoplosternum.

Keywords: Cytogenetic; Catfishes; Hoplosternum; Siluriformes.

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