Appearance
The adult is a small fritillary with typically chequered orange-brown upperside and a submarginal row of triangles and dots. The length of the forewings is 16–17 mm. The underside is distinctive in having a purplish band across the hindwing."B. dia" differs from the Pearl-bordered Fritillary in having a sharp angle to its hindwing (readily seen from underside when perched with wings closed). The similar Titania's Fritillary has a less sharply-angled hindwing and only occurs at high altitude.
In Europe the larvae feed on Viola species (Viola odorata, Viola hirta, Viola canina, Viola reichenbachiana, Viola tricolor), and outside Europe on "Prunella vulgaris" and "Rubus idaeus"
Naming
* "Clossiana dia dia" western Europe.⤷ "Clossiana dia alpina" (Elwes, 1899);
⤷ "Clossiana dia calida" (Jachontov, 1911)
⤷ "Clossiana dia disconota" (Krulikovsky, 1909) central Europe and western Siberia.
⤷ "Clossiana dia semota" Tuzov, 2000;
⤷ "Clossiana dia setania" (Fruhstorfer, 1909)
Distribution
"B. dia" is found in Europe, over the Caucasus up to Mongolia. It is widespread and common across southern France. In Europe it occurs from northern Spain, Italy and Greece to Poland, the Balkans and Turkey. It is not found in Britain.References:
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