Cytogenetic characterization of the strongly electric Amazonian eel, Electrophorus electricus (Teleostei, Gymnotiformes), from the Brazilian rivers Amazon and Araguaia

Genetics and Molecular Biology

Soraia B.a. Fonteles²  Carlos E. Lopes²  Alberto Akama¹  Flora M.c. Fernandes²  Fábio Porto-foresti¹  José A. Senhorini¹  Maria De Fátima Z. Daniel-silva²  Fausto Foresti¹  Lurdes Foresti De Almeida-toledo² 

[1] ,Universidade de São Paulo Instituto de Biociências Departamento de Genética e Biologia EvolutivaSão Paulo SP ,Brazil

关键词: chromosome;    fish;    Gymnotidae;    electric eel;   

DOI  :  10.1590/S1415-47572008000200010

来源: SciELO

【 摘 要 】

A karyotype analysis of the electric eel, Electrophorus electricus (Teleostei, Gymnotiformes), a strongly electric fish from northern South America, is presented. Two female specimens were analyzed, one from the Amazon River and one from the Araguaia River. The specimens had a chromosomal number of 2n = 52 (42M-SM + 10A). C-bands were present in a centromeric and pericentromeric position on part of the chromosomes; some interstitial C-bands were also present. Heteromorphic nucleolus organizer regions (NORs) were detected in two chromosome pairs of the specimen from the Amazon River. The chromosome number and karyotype characteristics are similar to those of other Gymnotidae species. The genera Electrophorus and Gymnotus are positioned as the basal lineages in the Gymnotiformes phylogeny.

【 授权许可】

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