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vol.67 número4  suppl.Estudo citogenético comparativo em moscas da família MuscidaeVariabilidade genética intra e interpopulacional em Maytenus ilicifolia Mart. ex Reiss, utilizando marcadores RAPD índice de autoresíndice de assuntospesquisa de artigos
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Brazilian Journal of Biology

versão impressa ISSN 1519-6984versão On-line ISSN 1678-4375

Resumo

BENYA, E. et al. Chromosome polymorphism and complements in populations of Girardia species (Platyhelminthes, Tricladida, Paludicola) from southern Brazil. Braz. J. Biol. [online]. 2007, vol.67, n.4, suppl., pp.951-955. ISSN 1519-6984.  http://dx.doi.org/10.1590/S1519-69842007000500021.

The karyotypes of four species of freshwater triclads of the genus Girardia (Platyhelminthes), i.e. G. schubarti, G. tigrina, G. anderlani, and G. biapertura, from populations of different localities of the Rio Grande do Sul State, in southern Brazil, were analyzed. The karyotype of G. biapertura is presented for the first time. Three basic complements of 4, 8, and 9 chromosomes were found. Diploids, triploids, or mixoploids (2n/3n) specimens were frequently detected in these populations. The basic chromosomal complement of n = 9 was verified in two different species (G. biapertura and G. anderlani), presenting a large acrocentric chromosome which is rare in the family Dugesiidae. An intra and interspecific chromosomal variability was also detected and its evolutionary implications are discussed.

Palavras-chave : freshwater planarians; cytogenetics; genetic plasticity; chromosome variability.

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