Chironomus obtusidens Goetghebuer, 1921

Michailova, Paraskeva, 2024, Markers in the polytene chromosomes of freshwater Chironomus Meigen (Diptera, Chironomidae) species, Zootaxa 5453 (4), pp. 511-537 : 522

Chironomus obtusidens Goetghebuer

Chromosome set is 2n = 8. The chromosomes AB and CD are metacentric, chromosome EF—submetacentric, chromosome G—telocentric. The centromere regions of all chromosomes are characterized by distinct dark bands. Almost in the middle of chromosome G are two thick dark bands between which a dark thin band is visible as a species marker ( Fig. 10 ). This chromosome has two BRs and a NOR near to the centromeric region. In European populations, the species is slightly polymorphic, but in Siberian populations Kiknadze et al. (2016) reported 16 band sequences. Twelve individuals were studied.

Collection sites: Burgas and Varna regions in temporary water basin.

Figures

FIGURE 10. Polytene chromosomes of Chironomus obtusidens. 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.