Chironomus acidophilus Keyl, 1960

Michailova, Paraskeva, 2024, Markers in the polytene chromosomes of freshwater Chironomus Meigen (Diptera, Chironomidae) species, Zootaxa 5453 (4), pp. 511-537 : 526

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.

Figures

FIGURE 14. Polytene chromosomes of Chironomus acidophilus. The numbers on the chromosome arms indicate the “basic”sequences.The large arrows show the localization of the centromere region. The small arrow on chromosome G indicates the marker sequences required for species identification. BR—Balbiani Ring, NOR—Nuclear Organizer Region. A, B, C, D, E, F, G—arms of the chromosomes. Scale bar, 10µm.