Karyotype and morphology of the midge Stictochironomus crassiforceps (Kieffer) (Diptera, Chironomidae) from several parts of the Palaearctic

The karyotype characteristics of Stictochironomus crassiforceps (Kieffer) from several parts of the Palaearctic were studied. The polythene chromosomes were mapped, the main markers were described, and cytophotomaps of the populations from Armenia and Russia (Kabardino-Balkaria and the Middle Volga region) were compared. The karyotypes of S. crassiforceps from these three populations were found to differ in the nucleoli number, homo- and heterozygous inversions, and paracentromeric heterochromatin content. The larval, pupal, and adult male morphology of S. crassiforceps from Armenia and Kabardino-Balkaria is briefly described.