Chironomus muratensis Ryser, Scholl & Wülker

Michailova, Paraskeva, 2024, Markers in the polytene chromosomes of freshwater Chironomus Meigen (Diptera, Chironomidae) species, Zootaxa 5453 (4), pp. 511-537 : 519

Chironomus muratensis Ryser, Scholl & Wülker

The chromosome set is 2n = 8. Chromosomes AB, CD are metacentric, EF—submetacentric and G—telocentric ( Fig. 8 ). The centromere regions of the chromosomes are characterized by distinct dark bands. The G chromosome is partially unconjugated. The NOR is next to the centromeric region of the chromosome. It has two BRs. Arm B has very well-developed BR. Two dark bands of the chromosome G are centrally located, separated by several lighter disks—species markers ( Fig. 8 ). The species is highly polymorphous—25 band sequences have been reported by Kiknadze et al (2016). The material from Bulgaria has an inverted sequence in arm B ( Fig. 8 ). The arm C has an active NOR—a marker of the species. Forty-four individuals were studied.

Collection sites: Plovdiv: fish pool.

Figures

FIGURE 8. Polytene chromosomes of Chironomus muratensis. 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.