Chironomus pseudothummi Strenzke, 1959

Michailova, Paraskeva, 2024, Markers in the polytene chromosomes of freshwater Chironomus Meigen (Diptera, Chironomidae) species, Zootaxa 5453 (4), pp. 511-537 : 530-531

Chironomus pseudothummi Strenzke

The chromosome set is 2n = 8. AE chromosome is submetacentric, CD and BF —metacentric and chromosome G— telocentric ( Fig. 18 ). The centromere regions of the chromosomes are characterized by dark thin bands. Chromosome G has three BRs (BRa, BRb, BRc). However, BRa is not always expressed. The NOR of this chromosome is near to the centromere region. The light band sequences between BRb and NOR in chromosome G are the maker of the species ( Fig. 18 ). The band sequences of arm A are in inverted state (A2.2), also the “basic” sequences (A2.2) (1) of the arm are inverted. Five larvae were analyzed.

Collection sites: Sofia: South Park .

Modified “thummi” cytocomplex, with chromosome arm combinations AB CD GEF.

Figures

FIGURE 18. Polytene chromosomes of Chironomus pseudothummi. 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.