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was investigated using specimens from seven populations spanning Europe, West Siberia, and the Russian Far East. Morphological variation was largely continuous across most of the studied range, although populations from Siberia and the Russian Far East exhibited consistent differences in wing microtrichial patterns and wing vein ratios. Genetic analyses identified three major haplotype groups, including a widespread European-West Siberian cluster and two deeply divergent lineages restricted to the Russian Far East. One Far Eastern lineage showed genetic distances approaching interspecific levels and was strongly separated in multivariate morphospace, consistent with its recognition as a distinct species described elsewhere. Isolation-by-distance analyses revealed a significant association between geographic distance and morphological differentiation, whereas genetic differentiation showed weaker geographic structuring.
Triseleva et al. (Wed,) studied this question.