Abstract
Abstract Differences in erythrocyte size between tadpoles and adults have been found in numerous anuran species but there are no references about erythrocyte size of juveniles. We measured the size of red blood cells and nuclei of juvenile and adult individuals of Odontophrynus americanus. Erythrocyte and nuclear size of juvenile were significantly smaller than the corresponding sizes of adults. The erythrocytes of juvenile O. americanus were comparable in size to the erythrocytes of adult O. cordobae. We discuss about the possibility of correctly distinguishing juvenile O. americanus (tetraploid) from adult O. cordobae (cryptic diploid counterpart) specimens using erythrocytes. We also discuss possible causes of variation.
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