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Cytogenetics of four Brazilian Hyla species (Amphibia - Anura) and description of a case with a supernumerary chromosome

Flavio A. Baldissera Junior; Paulo Sergio Lopes de Oliveira; Sanae Kasahara

Departamento de Biologia, Instituto de Biociências - UNESP, Caixa Postal 199, 13506-900 Rio Claro, SP, Brasil. Seud correspondence to S.K.

ABSTRACT

The chromosomes of Hyla fuscovaria, II. hayii and 11. prasina, with 2n-24, and of Hyla sp. (aff circumdata), a new species, with 2n=24 and 2n-25, were studied.
The karyotypes wish 2n=24 in the four species were very similar, with almost no differences in the size and morphology of the chromosomes. The numerical variability found in Hyla sp. (aff circumdata) is due to the occurrence of a supernumerary chromosome in some specimens. NOR data obtained for the first time in the four species and C banding analysis of H. prasina indicate that such types of banding may be useful to differentiate species with very similar karyotypes, contributing to the understanding of chromosome evolution and the establishment of phylogenetic relationships among Brazilian Hyla species.

Keywords: Hyla; Amphibia; supernumerary chromosome.

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