- Family: Brushfooted Butterflies (Four-footed Butterflies) – Nymphalidae
- Subfamily: Heliconians (Longwings) – Heliconiinae
- Wing span: Medium-sized, 32–45 mm (1,25–1.76 in.). Females larger than males (and usually a little darker).
- Wing upper side: Orange with black blotches.
- Wing underside: Forewing orange to reddish brown and beige, with black blotches. Basal half of hind wing with black-edged reddish brown and beige strip comprised of black-edged blotches. Reddish brown strip’s central blotch with black spot. Beige strip’s central blotch often white or with pearly sheen. Very base of wing often with one pearly blotch. Outer half with reddish brown and beige patches. Margin with row of white or beige blotches, with row of blurred circles on basal side.
- Habitat: All kinds of both damp and dry environments.
- Flying time: June. In North Finland mid-June–mid-July.
- Overwintering form: Caterpillar.
- Larval foodplant: Violets and pansies (Viola) on meadows, Labrador tea (Ledum palustre) and bog bilberry (Vaccinium uliginosum) in bogs.
The pearl-bordered fritillary is common across all of Finland and is the earliest flyer of the commonest Heliconians. Good identifying marks are: 1) the edge of the upper surface of the hind wings has blotches formed of a row of black triangles, 2) the central square in the red strip on the underside of the hind wings has a small black spot (this is large on small pearl-bordered fritillary), 3) middle of pale yellow central strips has a white or shiny pearly patch, and 4) the basal side of the white margin blotches has black rings.
Males fly around restlessly looking for females, who lay their eggs in the ground close to the larvae’s foodplant. The pearl-bordered fritillary overwinters as a caterpillar and when it wakes up in the spring it continues eating the host plant before entering a cocoon for a couple of weeks to emerge as a flying butterfly.