Title:	Cytogenetic analysis in the incertae sedis species Astyanax altiparanae Garutti and Britzki, 2000 and Hyphessobrycon eques Steindachner, 1882 (Characiformes, Characidae) from the upper Paraná river basin.
Authors:	MARTINEZ, E. R. M. ALVES, A. L. SILVEIRA, S. M. FORESTI, F. OLIVEIRA, C.
Affiliation:	EMANUEL R. M. MARTINEZ, UNESP Botucatu-SP; ANDERSON LUIS ALVES, CNPASA; SARA M. SILVEIRA, UNESP Botucatu-SP; FAUSTO FORESTI, UNESP Botucatu-SP; CLAUDIO OLIVEIRA, UNESP Botucatu-SP.
Date Issued:	2012
Citation:	Comparative Cytogenetics, Sofia, v. 6, n. 1, p. 41-51, 2012.
Description:	Cytogenetic analyses were accomplished in two populations of Astyanax altiparanae Garutti & Britzki, 2000 and one population of Hyphessobrycon eques Steindachner, 1882, considered incertae sedis in Characidae family. Two populations of A. altiparanae (Mogi-Guaçu and Tietê rivers) presented 2n=50, with the same karyotype formula: 6M+12SM+20ST+12A (FN=88). H. eques from Capivara river presented 2n=52 and karyotype formula 14M+16SM+4ST+18A (FN=86). In each karyotype, the nucleolus organizer regions were detected at the end of the short arm of a single medium-sized subtelocentric chromosome. The Chromomycin A3 (CMA3) marking is coincident for the NORs in chromosomes of the two species and present additionally in two different chromosomes of A. altiparanae thus showing interpopulation differences in this species. In H. eques, weak heterochromatic blocks in the position of centromeres and telomeres of most chromosomes and negative C-banding for the NOR bearing chromosome were visualized. The obtained results contribute both to the understanding of karyotype evolution of these species and to the clarifying their phylogenetic relationships.
Thesagro:	Citogenética Cromossoma Peixe
NAL Thesaurus:	Cytogenetic analysis
DOI:	doi: 10.3897/CompCytogen.v6i1.1873
Type of Material:	Artigo de periódico
Access:	openAccess
Appears in Collections:	Artigo em periódico indexado (CNPASA)