Chironomus nudiventris Ryser, Scholl & Wülker

Michailova, Paraskeva, 2024, Markers in the polytene chromosomes of freshwater Chironomus Meigen (Diptera, Chironomidae) species, Zootaxa 5453 (4), pp. 511-537 : 531-532

Chironomus nudiventris Ryser, Scholl & Wülker

The chromosome set is 2n = 6. AB and CD chromosomes are metacentric, while GEF chromosome is submetacentric ( Fig. 19 ). The chromosome G that has formed by fusion with the EF chromosome has one NOR and two BRs. One BR is in arm B. The homologues of chromosome GEF are partially incongruent. The species markers in chromosome GEF are the two dark bands between which there are two lighter and two dark bands ( Fig.19 ). The species from the site in Bulgaria is monomorphic, while Kiknadze et al. (2016) reported high polymorphism in this species. Eight larvae were studied .

Collection sites: Sofia: National Park.

Parathummi cytocomplex with chromosome arm combinations AC BF DE G.

Figures

FIGURE 19. Polytene chromosomes of Chironomus nudiventris. 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.