Key points are not available for this paper at this time.
Illustrated description of adult male, as well as DNA barcoding, of Diamesa achipseensis sp. nov. in comparison with close related species D. caucasica Kownacki et Kownacka from Southwestern Caucasus are provided. Interspecific distances between D. achipseensis sp. nov. and D. caucasica are extremely low (0.64% in average) despite the identified morphological differences. High similarity of these species is new example of genetically indistinguishable of some species of the genus Diamesa Meigen.
MAKARCHENKO et al. (Thu,) studied this question.