Introduction The family Aphelinidae (Hymenoptera, Chalcidoidea) currently includes 43 genera and 1168 species (Noyes, 2017) placed in five subfamilies (Aphelininae, Calesinae, Coccophaginae, Eretmocerinae, and Eriaphytinae) according to the recent classification by Heraty et al. (2013). Most of the species of Aphelinidae are parasitoids of Hemiptera while others also parasitize upon Orthoptera, Hymenoptera, Diptera, and Lepidoptera (Yasnosh, 1995). The genus Aphelinus Dalman (Aphelininae) includes the parasitoid species of sap-sucking aphids (Aphidomorpha) and hence has great potential in biocontrol applications (Nikol'skaya and Yasnosh, 1966; Chervonenko, 1997; Yasnosh, 2002). Species diversity and distribution within this genus is relatively well known. In particular, among the 98 described species worldwide, 37 and 15 species are known from Europe and the Caucasus, respectively