The nesting biology of Chalybion turanicum (Gussakovskij, 1935) has been studied, with a total of 31 nests being examined. All studied nests were located inside the old nest cells of Sceliphron destillatorium (Illiger, 1807). Each nest of Ch. turanicum consisted of a single cell. Females hunted for spiders, with 18 species in five families being identified among their prey. Two most abundant victim groups were Theridiidae (eight species, 54% of specimens) and Araneidae (seven species, 33% of specimens) spiders. A spider number stored in a cell varied from five to 31 (mean = 17.6 ± 5.4). In the Crimea, Ch. turanicum has one generation per year with reproductive success of 67%. Two species of the nest parasites were reared from cells of Ch. turanicum: Chrysis taczanovskii Radoszkowski, 1876 and Acroricnus seductor (Scopoli, 1786). Chalybion turanicum is the seventh invasive species of Sphecidae naturalized in Europe.
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