Resumo

CARAMELLO, C.S; SANCHEZ, S  e  JORGE, L.C. Caracterización citogenética de Hoplosternum littorale (Pisces, Siluriformes) del río Riachuelo (Corrientes, Argentina). Rev. vet. [online]. 2013, vol.24, n.1, pp.29-31. ISSN 1669-6840.

Hoplosternum littorale, commonly known as "armored catfishes", are widely distributed in South America. Three specimens captured in Riachuelo river (two females and a male) were cytogenetically analyzed. Fishes were characterized to have 60 chromosomes. Karyotype formula was made up with 8 meta-submetacentrics and 52 acrocentric chromosomes, the fundamental number was 68 in both sexes, and there were no chromosomic differences between them. Just one pair of subtelo-acrocentrics chromosomes showed NOR with silver nitrate impregnation, situated on the short arm of pair five. C-banding reveled a great amount or chromatin blocks in most of the chromosomes; they were located in subterminal and interstitial regions. These data reveal that H. littorale has a conserved karyotypic evolution. The cytogenetic studies should be complemented by molecular markers for further understanding of the evolutionary relationships and the maintenance of the karyotypic macroestructure of the species.

Palavras-chave : Hoplosternum littorale; Karyotype; C-banding; NOR; Argentina.

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