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Chromosomal localization of ribosomal RNA coding genes has been studied by using FISH (fluorescence  in situ  hybridization) in 21 species from the genus    Chironomus    Meigen, 1803. Analysis of the data has shown intra- and interspecific variation in number and location of 5.8S rDNA hybridization sites in 17 species from the subgenus    Chironomus    and 4 species from the subgenus    Camptochironomus    Kieffer, 1914. In the majority of studied species the location of rDNA sites coincided with the sites where active NORs (nucleolus organizer regions) were found. The number of hybridization sites in karyotypes of studied chironomids varied from 1 to 6. More than half of the species possessed only one NOR (12 out of 21). Two rDNA hybridization sites were found in karyotypes of five species, three – in two species, and five and six sites – in one species each. NORs were found in all chromosomal arms of species from the subgenus    Chironomus    with one of them always located on arm G. On the other hand, no hybridization sites were found on arm G in four studied species from the subgenus    Camptochironomus   . Two species from the subgenus    Chironomus    –    Ch.   balatonicus    Devai, Wuelker &amp; Scholl, 1983 and   Ch.  “ annularius ”  sensu Strenzke, 1959 – showed intraspecific variability in the number of hybridization signals. Possible mechanisms of origin of variability in number and location of rRNA genes in the karyotypes of species from the genus    Chironomus    are discussed.

Chromosomal organization of the ribosomal RNA genes in the genus Chironomus ( Diptera , Chironomidae )