polytypic and polymorphic cytogenetic variations in the widespread anuran physalaemus cuvieri (anura, leiuperidae) with emphasis on nucleolar organizing regions.we investigated the nor distribution in ten populations of physalaemus cuvieri from different regions of brazil and argentina. a high variability in nor pattern was observed and provided a useful tool in grouping several populations. the specimens from the state of tocantins, northern brazil, could easily be distinguished from all the other analyzed populations, since its karyotype presented nors in the chromosome pairs 1,3,4 and 10 (and sometimes also in chromosome 5), and several pericentromer ...200919621135
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