| Autor: |
Silva MJD; Universidade Estadual Paulista, Departamento de Biologia Geral e Aplicada, Instituto de Biociências, Avenida 24A, 1515, Bela Vista, 13506-900 Rio Claro, SP, Brazil., Santos MD; Universidade Estadual Paulista, Departamento de Biologia Geral e Aplicada, Instituto de Biociências, Avenida 24A, 1515, Bela Vista, 13506-900 Rio Claro, SP, Brazil., Gazoni T; Universidade Estadual Paulista, Departamento de Biologia Geral e Aplicada, Instituto de Biociências, Avenida 24A, 1515, Bela Vista, 13506-900 Rio Claro, SP, Brazil., Cholak LR; Universidade Estadual Paulista, Departamento de Biologia Geral e Aplicada, Instituto de Biociências, Avenida 24A, 1515, Bela Vista, 13506-900 Rio Claro, SP, Brazil., Haddad CFB; Universidade Estadual Paulista, Departamento de Biodiversidade e Centro de Aquicultura, Instituto de Biociências, Avenida 24A, 1515, Bela Vista, 13506-906 Rio Claro, SP, Brazil., Parise-Maltempi PP; Universidade Estadual Paulista, Departamento de Biologia Geral e Aplicada, Instituto de Biociências, Avenida 24A, 1515, Bela Vista, 13506-900 Rio Claro, SP, Brazil. |
| Abstrakt: |
Taxonomic and cytogenetic aspects of Proceratophrys have not been thoroughly clarified in the literature; thus, the objective of the present study was to provide unprecedent karyotype data regarding P. schirchi, P. laticeps and P. melanopogon. Additionally, the karyotype of P. boiei (2n = 22) and its ZZ / ZW sex chromosome system was analyzed for different populations of southeastern and southern Brazil. All Proceratophrys species have a diploid number of 2n = 22 chromosomes. In P. schirchi, a strong C-band was found in the long arm in one of the homologues of the pair 8 in female metaphasic cells, denoting that this chromosome pair could represent the heteromorphic sex chromosome in a ZZ / ZW sex system. Despite the conserved number of chromosomes, there are considerable chromosomal differences in P. melanopogon and P. boiei (southern Brazil), strongly differentiating them cytogenetically from other species of the genus. Moreover, with the confirmation of chromosomal heteromorphism related to sexual differentiation in P. boiei and the possible description of this system in P. schirchi, the Proceratophrys genus can be regarded as an interesting group for evolutionary studies and sex chromosome differentiation in anurans. |
