Karyotypic characterization of two species of the genus Imparfinis(Teleostei, Siluriformes, Heptapteridae).
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Accession number;02A0714925
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| Title;Karyotypic characterization of two species of the genus Imparfinis(Teleostei, Siluriformes, Heptapteridae). |
| Author;
VISSOTTO P C
(Univ. Estadual Paulista, Sp, Bra)
FORESTI F
(Univ. Estadual Paulista, Sp, Bra)
OLIVEIRA C
(Univ. Estadual Paulista, Sp, Bra)
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Journal Title;Chromosome Sci
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Journal Code:S0638B
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ISSN:1344-1051
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VOL.5;NO.2;PAGE.97-103(2001)
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| Figure&Table&Reference;FIG.3, TBL.1, REF.17 |
| Pub. Country;Japan |
| Language;English |
| Abstract;Two fish species of the genus Imparfinis were cytogenetically analyzed. Imparfinis piperatus cytotype A showed 2n=58 chromosomes, with 32 of them being metacentrics(M) and 26 submetacentrics(SM); cytotype B displayed 26M, 22SM, 8 subtelocentrics(ST), and 2 acrocentrics(A). Both karyotypes presented interstitial nucleolar organizer regions(NORs) located on the long arms of the first chromosome pair, a metacentric pair. Imparfinis cf. piperatus, shows 2n=56 chromosomes(22M, 26SM, 4ST, and 4A) and interstitial NORs on the long arm of chromosome pair 28, an acrocentric pair. Small differences were observed in the pattern of C-band positive heterochromatin distribution between the species analyzed, with a prevalence of pericentromeric and telomeric segments. The karyotypic differences suggest that a taxonomic revision of the genus Imparfinis is necessary. (author abst.) |
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