Eur. J. Entomol. 105 (2): 175-184, 2008 | 10.14411/eje.2008.026

Cytotaxonomy and karyology of the tribe Otiorhynchini (Coleoptera: Curculionidae)

Dorota LACHOWSKA1, Maria ROŻEK1, Milada HOLECOVÁ2
1 Institute of Systematics and Evolution of Animals, Polish Academy of Science, Sławkowska 17, 31-016 Kraków, Poland; e-mail: lachowska@isez.pan.krakow.pl
2 Department of Zoology, Comenius University, Mlynská dolina B-1, 842-15 Bratislava, Slovakia

A cytogenetic study of bisexual species belonging to the genera Cirrorhynchus, Dodecastichus and Otiorhynchus is presented in order to confirm their taxonomic position. The karyotype characterization was accomplished by an analysis of mitotic and meiotic chromosomes after differential staining, namely by C-banding, silver impregnation, DAPI and CMA3. A review of the cytogenetic data for the tribe Otiorhynchini contributed to knowledge of chromosomal evolution in this group. An investigation of five of the species studied showed some similarities such as a sex chromosome system of "parachute type" (Xyp), the presence of 10 autosomal bivalents (2n = 22) and heterochromatin localized around centromeres. These observations are similar to those already described for Otiorhynchini species, and confirm the karyological conservatism of this weevil group. In contrast, another species Cirrorhynchus kelecsenyi has an additional four autosomal bivalents (n% = 14 + Xyp, 2n = 30), which differs considerably from the chromosomal homogeneity of the other genera. Karyotypic evolution in this species was achieved most probably by increasing the number of chromosomes by centric fissions, resulting in variation in the number of acrocentric chromosomes. DAPI-positive and CMA3-negative reactions of heterochromatic DNA in all the species studied suggest that it has an AT-rich composition. Impregnating chromosomes with silver nitrate reveals NORs on one pair of autosomes, and probably argentophilic material in the interspace between the X and y sex chromosomes. The karyological findings support the taxonomical revision of Otiorhynchini based on morphological characters.

Keywords: C-banding, chromosome number, Coleoptera, Curculionidae, fluorochrome staining, karyotype, NORs, taxonomy

Received: October 3, 2007; Accepted: November 20, 2007; Published: May 15, 2008

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