Astyanax hastatus Myers, 1928 (Teleostei, Characidae): a new species complex within the genus Astyanax?
Genet. mol. biol
;
32(3): 477-483, 2009. ilus, mapas, tab
Article
in English
| LILACS
| ID: lil-522315
ABSTRACT
Four populations of Astyanax hastatus Myers 1928 from the Guapimirim River basin (Rio de Janeiro State) were analyzed and three distinct cytotypes identified. These cytotypes presented 2n = 50 chromosomes, with 4M+8SM+10ST+28A (Cytotype A), 8M+10SM+14ST+18A (Cytotype B), 6M+8SM+4ST+32A (Cytotype C) and scanty heterochromatin, mainly located throughout pericentromeric regions of several chromosomal pairs. No homologies with the As-51 satellite DNA were observed in the three cytotypes, although all of them presented multiple 18S rDNA sites, as detected by both silver nitrate staining and FISH (fluorescent in situ hybridization). The application of the term "species complex" in Astyanax is discussed from a cytotaxonomic viewpoint.
Full text:
Available
Index:
LILACS (Americas)
Main subject:
DNA, Satellite
/
Fishes
Limits:
Animals
Language:
English
Journal:
Genet. mol. biol
Journal subject:
Genetics
Year:
2009
Type:
Article
Affiliation country:
Brazil
Institution/Affiliation country:
Universidade Federal de Viçosa/BR
/
Universidade de São Paulo/BR
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