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Type: Artigo de periódico
Title: Supernumerary chromosomes in the pufferfish Sphoeroides spengleri - First occurrence in marine Teleostean Tetraodontiformes fish
Author: Alves, AL
Porto-Foresti, F
Oliveira, C
Foresti, F
Abstract: Cytogenetic analyses carried out in eight specimens of Sphoeroides spengleri revealed the presence of 2n = 46 chromosomes (20 M/SM and 26 SPA). Besides the standard karyotypical set, the presence of B microchromosomes was observed in two individuals, ranging,from 0 to 2 microchromosomes per cell. A karyotype composed by 2n = 46 chromosomes with occurrence of M and SM chromosomes is considered basal for the species from the clade comprising the families Tetraodontidae, Balistidae, and Diodontidae, although it represents a derived condition for the order Tetraodontiformes, whose basal karyotype would be composed by 2n = 48 acrocentric chromosomes. The occurrence of B microchromosomes in marine Tetraodontiformes fish was not known, and this represents the first report of such a chromosomal type.
Subject: B chromosome
Sphoeroides spengleri
Country: Brasil
Editor: Soc Brasil Genetica
Rights: aberto
Identifier DOI: 10.1590/S1415-47572008000200014
Date Issue: 2008
Appears in Collections:Unicamp - Artigos e Outros Documentos

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