Chromosome R-banding pattern and conservation of a marker chromosome in four species, genus Astyanax (Characidae, Tetragonopterinae)

Abstract

The R-banding pattern obtained by 5-Bromodeoxiuridine incorporationin the chromosomes was analyzed in four species from genus Astyanax (Pisces, Characidae), A. altiparanae, A. fasciatus, A. schubarti and A. scabripinnis using specimens sampled from populations of the upper Paraná river system, in Brazil. Chromosome constitution and C-band pattern are also described forthe four species. The occurrence of chromosome homoeologies of several chromosomepairs, including a chromosome marker that is found in almost every species belonging to family Characidae was observed. These chromosome similarities may indicate a close evolutionary relationship within this group of species. © 2001 Taylor & Francis Group, LLC.