Abstract
Lycaena ratushinskayae sp. n. is described from the Baitag mountain range isolated in the Dzhungarian Gobi desert, SW Mongolia. Externally the new species strongly differs from related taxa by a dark-gray underside and deep reddish upperside with widened blackish margins. A new study of the male genitalia is performed with the diagnosis of new and all related species. It is confirmed that juxta presents the most valuable sclerite for taxonomic purposes.
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