Chironomus annularius sensu Strenzke

Michailova, Paraskeva, 2024, Markers in the polytene chromosomes of freshwater Chironomus Meigen (Diptera, Chironomidae) species, Zootaxa 5453 (4), pp. 511-537 : 515

Chironomus annularius sensu Strenzke

Chromosome set of the species is 2n = 8. Chromosomes AB, CD are metacentric, EF—submetacentric and G— telocentric. The species has four NORs: in chromosome arms A, C, E and arm G ( Fig.3 ). Chromosome arm A has an inverted chromosome sequence A2.2. The “basic” sequences are located in the middle of the arm, next to NOR ( Fig. 3 ). All other “basic” sequences are as in C.piger . Species markers are the three BRs located in the shortest chromosome G, one of which is located at the telomere and the other two are after the NOR. The series of dark and light bands between the BR and NOR of the chromosome G is a marker for the species. A high genomic instability was found in the species inhabiting regions highly polluted with heavy metals ( Michailova et al. 2018). Seventy-two individuals were studied.

Collection sites: Sofia: South Park , Bezden , Plovdiv: fish pool, Mariza River , Blagoevgrad, Dimitrovgrad, Durankulak, Shable Lake .

Figures

FIGURE 3. Polytene chromosomes of Chironomus annularius. 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.