Observation reveals two new butterfly species and confirms a rare population in the Western Stara Planina Mountains, indicating biodiversity importance.
In the present article, we reported two new species for the Western Stara Planina Mountains - Euphydryas aurinia (Rottemburg, 1775), Heteropterus morpheus (Pallas, 1771). A confirmation of a recently discovered population of Apatura metis Freyer, 1829 is given too.
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Mario Langourov (2025) studied this question.
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