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Cytogenetic Variability in Genus Odontocheila (Coleoptera, Cicindelidae): Karyotypes, C-Banding, NORs and Localisation of Ribosomal Genes of O. Confusa and O. Nodicornis

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Abstract

Two species of Odontocheila, O. confusa and O. nodicornis, from the Neotropical Region were studied regarding their karyotypes, localisation and activity of ribosomal genes and C-banding. The species, although belonging to the same genus, have quite distinct karyotypes. O. confusa has 10 pairs of autosomes and a single sex chromosome mechanism of the XY/XX type, thus a diploid value of 2n = 22 in males and females. One aneuploid male with a diploid number of 2n = 20 and one male with three B chromosomes were found in a total of eight males studied. O. nodicornis has 17 autosomal pairs and also a single chromosome system but of the X0/XX type, thus a diploid value of 2n = 35 in males and 2n = 36 in females. Fluorescence in situ hybridisation (FISH) revealed the presence of rDNA clusters in two autosomes in both species in mitotic and meiotic figures. Silver staining of male interphase nuclei confirmed the FISH results and showed that all rDNA genes were active. C-banding analysis revealed the presence of constitutive heterochromatin in the centromeres of all chromosomes in the two species plus two pairs in O. nodicornis with terminal positive C-bands. These results are discussed from the cytogenetic and evolutionary point of view.

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Proença, S., Serrano, A. & Collares-Pereira, M. Cytogenetic Variability in Genus Odontocheila (Coleoptera, Cicindelidae): Karyotypes, C-Banding, NORs and Localisation of Ribosomal Genes of O. Confusa and O. Nodicornis . Genetica 114, 237–245 (2002). https://doi.org/10.1023/A:1016221430207

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