Karyology of the toadfish Porichthys plectrodon (Jordan and Gilbert, 1882) (Batrachoididae) from Margarita Island,Venezuela |
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| Authors: | Nirchio M. Fenocchio A. S. Swarça A. C. Pérez J. E. |
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| Affiliation: | (1) Escuela de Ciencias Aplicadas del Mar, Universidad de Oriente, Porlamar, Isla de Margarita, Venezuela;(2) Departamento de Genética, Centro Politécnico, Universidade Federal do Paraná, Curitiba, Brazil;(3) Departamento de Biologia Geral, Universidade Estadual de Londrina, Caixa Postal 6001, CEP 86051-990 Londrina, PR, Brazil;(4) Instituto Oceanográfico de Venezuela, Universidad de Oriente, Cumaná, Venezuela |
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| Abstract: | This paper reports the results of cytogenetic analyses carried out on Porichthys plectrodon using conventional Giemsa staining, C-banding and silver staining techniques. A diploid chromosome count of 2n=44 was observed, consisting of 8 metacentric, 10 submetacentric, 6 subtelocentric and 20 acrocentric chromosomes. Differences in length made it possible to identify homologous chromosomes within the metacentric group. Constitutive heterochromatin was distributed as large pericentromeric blocks in pairs 1 and 2, while the rest of the chromosomes were marked in centromeric regions, some more conspicuously than others. One pair of small-sized acrocentric NOR-bearing chromosomes (21) was identified by the nucleolar regions located terminally on their short arms.Communicated by P.W. Sammarco, Chauvin |
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