Use este identificador para citar ou linkar para este item: https://repositorio.inpa.gov.br/handle/1/18662
Título: The karyotypes of the thorny catfishes Wertheimeria maculata Steindachner, 1877 and Hassar wilderi Kindle, 1895 (Siluriformes: Doradidae) and their relevance in doradids chromosomal evolution
Autor: Eler, Eduardo Schmidt
Dergam, Jorge Abdala S.
Venere, Paulo Cesar
Paiva, Lílian C.
Miranda, Gabriela A.
Oliveira, Alessandro A.
Palavras-chave: Animals
Catfish
Chromosome
Female
Genetics
Karyotyping
Evolution, Molecular
Phylogeny
Animal
Catfishes
Chromosomes
Evolution, Molecular
Female
Karyotyping
Phylogeny
Doradidae
Hassar (catfish)
Siluriformes
Wertheimeria
Data do documento: 2007
Revista: Genetica
Encontra-se em: Volume 130, Número 1, Pags. 99-103
Abstract: We studied the karyotypes of two doradids, the rare and endangered Wertheimeria maculata and a derived Amazonian species, Hassar wilderi. Cytogenetic characterization was assessed using conventional staining (Giemsa), C-banding, and NOR banding. Both species had 2n = 58 chromosomes but differed in their chromosome formulae, 24 m + 14sm + 8st + 12a for W. maculata and 32 m + 16sm + 10st for H. wilderi. In W. maculata heterochromatin was mainly telomeric, and three chromosomes had a fully heterochromatic arm; in H. wilderi heterochromatin was also predominantly telomeric and evident in many more chromosomes. Hassar wilderi also presented one pair of homologues with a fully heterochromatic arm. In both species, nucleolar organizer regions were restricted to one pair of subtelocentric chromosomes. Assuming a basal position for W. maculata, we hypothesized that underlying conserved diploid and NOR-bearing chromosome numbers, chromosomal evolution in doradids has involved pericentric inversions and an increase of heterochromatic blocks. © 2006 Springer Science+Business Media B.V.
DOI: 10.1007/s10709-006-0023-4
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