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SUMMARYWe carried out a comparative cytogenetic study on gall-forming generations of Tetraneura nigriabdominalis and Tetraneura ulmi using NOR and C-banding followed by Giemsa, Chromomycin A3 (CMA3) and DAPI staining reactions in order to improve our knowledge of these species and better define their identification. In both species, C-banding revealed that heterochromatin was not equilocated on each chromosome. Moreover, in T. nigriabdominalis the C-banding technique identified B chromosomes. The different response to the CMA3 and DAPI staining reactions after C-banding points out heterogeneity of the heterochromatic DNA composition in both species. Moreover, both CMA3 and silver staining revealed heteromorphism of NORs.

Cytogenetic analysis on the gall generation of two aphid species:Tetraneura nigriabdominalisandT. ulmi