Strategies of karyotype differentiation in Elateridae (Coleoptera, Polyphaga)

The chromosome study of five species of the family Elateridae, belonging to the subfamilies Agrypninae and Elaterinae, and the analysis of the cytogenetic data previously recorded for this family permitted the establishment of the main strategies of karyotypic differentiation that has occurred in th...

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Bibliographic Details
Published in:Micron (Oxford, England : 1993) England : 1993), 2007-01, Vol.38 (6), p.590-598
Main Authors: Schneider, Marielle Cristina, Rosa, Simone Policena, Almeida, Mara Cristina, Costa, Cleide, Cella, Doralice Maria
Format: Article
Language:English
Subjects:
Animals
C-band
Chromosome
Chromosome Banding
Chromosomes - genetics
Coleoptera - classification
Coleoptera - genetics
Cytogenetic Analysis
Evolution
Evolution, Molecular
Female
Karyotyping - methods
Male
Meiosis
Sex determination system
Species Specificity
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Summary:The chromosome study of five species of the family Elateridae, belonging to the subfamilies Agrypninae and Elaterinae, and the analysis of the cytogenetic data previously recorded for this family permitted the establishment of the main strategies of karyotypic differentiation that has occurred in the elaterids. In Agrypninae, the three species studied ( Conoderus fuscofasciatus, Conoderus rufidens, and Conoderus sp.) showed the male karyotype 2 n = 16 + X0. This karyotypic uniformity detected in these Conoderus species has also been shared with other species of the same genus, differing considerably from chromosomal heterogeneity verified in the subfamily Agrypninae. The use of the C-banding technique in C. fuscofasciatus and Conoderus sp. revealed constitutive heterochromatin in the pericentromeric region of the majority of the chromosomes. In C. fuscofasciatus, additional constitutive heterochromatin were also observed in the long arm terminal region of almost all chromosomes. Among the representatives of Elaterinae, the karyotype 2 n = 18 + Xy p of Pomachilius sp.2 was similar to that verified in the majority of the Coleoptera species, contrasting with the chromosomal formula 2 n = 18 + X0 detected in Cardiorhinus rufilateris, which is most common in the species of Elaterinae. In the majority of the elaterids, the chromosomal differentiation has frequently been driven by reduction of the diploid number; but, among the four cytogenetically examined subfamilies, there are some differences in relation to the trends of karyotypic evolution.
ISSN:0968-4328
1878-4291
DOI:10.1016/j.micron.2006.10.002