Resumen

CARAMELLO, C.S; SANCHEZ, S  y  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.

Palabras clave : Hoplosternum littorale; Karyotype; C-banding; NOR; Argentina.

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