Machado, Santos Natalia [UNESP]Ferreira-Neto, Maressa [UNESP]Bakkali, MohammedVicari, Marcelo RicardoArtoni, Roberto Ferreirade Oliveira, Claudio [UNESP]Foresti, Fausto [UNESP]2014-05-202014-05-202012-01-01Caryologia. Florence: Univ Florence Botany Inst, v. 65, n. 1, p. 40-46, 2012.0008-7114http://hdl.handle.net/11449/18683Several cases of natural triploidy have already been described in fish, however this is the first report of a surviving triploid that also carries two different supernumerary chromosomes. Cytogenetic analysis of an Astyanax scabripinnis population revealed a standard karyotype of 2n = 50, with a chromosome formula consisting of: 6 metacentric + 16 submetacentric + 14 subtelocentric + 14 acrocentric chromosomes. In addition, specimens showed a polymorphism for the presence of up to two supernumerary chromosomes. Among the specimens analyzed one was a natural triploid (with 75 chromosomes) that also carried a small sized and a macro-supernumerary chromosome. The co-occurrence of spontaneous triploidy and two supernumerary chromosome indicates the viability of this karyotype constitution as well as this fish capacity of tolerating extra chromosomes in large numbers.40-46engAstyanax scabripinnisnucleolus organizer regionspolyploidysupernumerary chromosomeArtigo10.1080/00087114.2012.678086WOS:000310431600007Acesso restrito080479394484636702974198821611140000-0002-4143-7212