Markers in the polytene chromosomes of freshwater Chironomus Meigen (Diptera, Chironomidae) species Author Michailova, Paraskeva text Zootaxa 2024 2024-05-22 5453 4 511 537 http://dx.doi.org/10.11646/zootaxa.5360.3.8 journal article 10.11646/zootaxa.5453.4.3 1175-5326 11239735 B535A3FF-151C-4070-9BE7-2FE6E3238847 Chironomus acidophilus Keyl Chromosome set is 2n = 8. Chromosome AE is submetacentric, chromosomes CD and BF are metacentric, chromosome G—telocentric. Chromosome G has three BRs, however one of them is not always expressed. The two dark large bands, near to the telomere of chromosome G are markers of the species ( Fig. 14 ). The NOR is near to the centromere region of the chromosome G. On this region the homologues are unpaired ( Fig. 14 ). Chromosome variability of the species is expressed by two types of aberrations: inherited and somatic ( Michailova et al . 2009 ). These authors discussed the appearance of the specific puff at the telomere of chromosome G as a compensatory mechanism in response to environmental conditions. Thirty-five individuals were analyzed . Collection sites : Smolian: Chairski and Smolian Lakes, Chepelare: fish pool.