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Genetics and Molecular Biology
On-line version ISSN 1678-4685
LANZONE, Cecilia and SOUZA, Maria José de. Chromosome complement and meiosis in three species of the Neotropical bug genus Antiteuchus (Heteroptera, Pentatomidae, Discocephalinae). Genet. Mol. Biol. [online]. 2006, vol.29, n.1, pp. 49-55. ISSN 1678-4685. http://dx.doi.org/10.1590/S1415-47572006000100011.
Orcein staining of spermatocytes was used to study the meiotic behavior of holocentric chromosomes in three member of the genus Antiteuchus (commonly known as stink bugs). We describe and illustrate the karyotype of Antiteuchus mixtus, A. sepulcralis and A. macraspis which were cytogenetically characterized as having a diploid number of 2n = 14 and an XY sex chromosome system showing pre-reductional meiosis for autosomes and post-reductional meiosis for sex chromosomes. These species were also shown to have a long diffuse stage during meiotic prophase I and aberrant harlequin-type meiocytes. The chiasma frequency was also analyzed for two of the three species studied.
Keywords : spermatogenesis; holokinetic chromosomes; sex chromosomes; meiosis; diffuse stage.