Euphydryas iduna is a small butterfly found in the Palearctic (Arctic Europe, Arctic Asia, Caucasus Major, Alatau, Russian Far East, Altai, Sayan) [2] that belongs to the browns family.

This butterfly represents the preceding species Euphydryas maturna in the high north of Europe and in the mountains of Northern Asia.

Specimens from the Altai differ from European ones in the stronger silvery gloss of the light markings, especially beneath.

sulitelmica Schultz (65b) the light median band is narrower and the hindwing above is dusted with black.

The species flies early in July in abundance on barren alpine meadows at altitudes of 6,000 to 8,000 feet (1,800 to 2,400 m) in company with aurinia and cinxia.