First cytogenetic description of the species Rhamdella microcephala (Pisces, Hepapteridae)
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Data
2003-03-01
Autores
Fonseca, Yris Maria
Oliveira, Claudio
Foresti, Fausto
Maistro, Edson Luis
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Resumo
Cytogenetic studies were carried out on Rhamdella microcephala collected from the headwaters of the Machado river, a tributary of the SapucaĆ river, Minas Gerais, Brazil. Sixteen specimens exhibited 2n=56 chromosomes, with 18 metacentrics, 30 submetacentrics and 8 subtelocentric-acrocentrics (FN=84). The nucleolar organizing regions (NORs) were identified in the interstitial position on the long arm of a submetacentric pair (pair 12). Chromomycin A3 staining evidenced only the NOR-bearing segments. Positive C-band segments were identified in a pericentromeric position in most of the chromosomes and the NOR-bearing segments were also C-band positive. Some aspects related to the chromosomal characteristics of Rhamdella microcephala are discussed.
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C-band, Cytogenetics, Hepapteridae, NOR, Rhamdella microcephala, Microcephala, Pisces
Como citar
Cytologia, v. 68, n. 1, p. 31-34, 2003.