Identifying features
Wingspan 27–34 mm. Both sexes have a blue-violet, dark upper wing surface. The undersides are mostly grey, with a white cross-band and a dark shadow over the wings. The hindwing has a yellowish-orange, rounded spot with a dark center near the "tail".
Similar species
No confused species are described in the examined sources.
Distribution
Widespread in the southeast Norway along the coast of Kristiansand. Also found in Denmark and the southernmost Sweden and Finland.
Biology
The larvae live on oak trees, both from young leaves and cups.