Cytogenetic analyses of Pseudopimelodus mangurus (Teleostei: Siluriformes: Pseudopimelodidae)
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Data
2004-12-01
Autores
Martinez, Emanuel Ricardo Monteiro [UNESP]
Oliveira, Claudio [UNESP]
Foresti, Fausto [UNESP]
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Resumo
The cytogenetic analyses showed that Pseudopimelodns mangurus has a diploid number of 2n=54 chromosomes (6M, 26SM, 12ST and 10A), single Ag-NORs on the short arm of a middle-sized ST pair, identified as pair 19, and a very small amount of C-band positive segments in two chromosome pairs. The Ag-NORs are C-band positive. The staining of the chromosomes of P. mangurus with CMA 3 reveled the occurrence of bright signals corresponding to the Ag-NORs segments, to the C-band positive segments and also to some C-band negative segments. The occurrence of a diploid number of 2n=54 in all species of the family Pseudopimelodidae and its absence among representatives of Pimelodidae and Heptapteridae, two related families previously considered, reinforces the hypothesis that Pseudopimelodidae is a monophyletic group. © 2004 The Japan Mendel Society.
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Palavras-chave
Ag-NORs, C-band, Chromomycin A3, Chromosomes, Karyotype, Pimelodidae, Pseudopimelodidae, Pseudopimelodus, Siluriformes, Teleostei
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Cytologia, v. 69, n. 4, p. 419-424, 2004.