Boloria frigga

(Thunberg, 1791)

Frigga Fritillary

Boloria frigga is a circumboreal fritillary distributed across northern bogs and tundra . The exhibits a , producing one every two years. feed on specific bog plants including cloudberry (Rubus chamaemorus) and small (Vaccinium oxycoccos). The species name derives from Frigg, a goddess in Norse mythology.

Pronunciation

How to pronounce Boloria frigga: /bɔˈloʊriə ˈfrɪɡə/

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Identification

Distinguished from similar fritillaries by the characteristic under surface pattern: broad cinnamon margin and relatively unmarked with only slight contrast between pale margin and cinnamon base. The straight, margin-parallel black markings on the upper surface also aid identification. Most similar to other Boloria , but the specific pattern elements are diagnostic.

Appearance

Above pale reddish with black markings in central and marginal areas; markings are very straight and parallel with the margin. under surface has a broad cinnamon margin. under surface is but little , with a paler distal margin contrasting with the cinnamon area. on under surface dusted with cinnamon and only slightly prominent, with an irregularly rhomboidal pale spot before the middle of the being conspicuous.

Habitat

Occurs in bogs and tundra, specifically willow and sphagnum bogs. Found in and subarctic regions, typically north of 60° N in Europe. characterized by presence of larval plants in wetland conditions.

Distribution

Circumboreal distribution: Northern Europe (north of 60° N, with very local southern occurrences), Urals, Siberia, Northern Mongolia, Russian Far East, western United States and Canada. Recently recorded from Kolguev Island in Russia.

Diet

feed on Rubus chamaemorus (cloudberry), Vaccinium oxycoccos (small ), and occasionally Vaccinium uliginosum (bog bilberry). In experimental conditions, larvae have been observed to accept Polygonum viviparum and Rubus fruticosus.

Host Associations

Rubus chamaemorus - larval primary
Vaccinium oxycoccos - larval primary
Vaccinium uliginosum - larval occasional
Polygonum viviparum - experimental acceptanceaccepted in laboratory conditions, not confirmed as
Rubus fruticosus - experimental acceptanceaccepted in laboratory conditions, not confirmed as

Life Cycle

Produces one every two years ( ). Specific details of , larval, pupal, and stages are not documented in available sources.

Similar Taxa

Boloria seleneSimilar size and general fritillary appearance; distinguished by pattern details, particularly the more under surface and different marginal banding patterns. B. selene has more prominent silver markings on underside.
Other Boloria speciesShare general fritillary and bog-dwelling habits; require careful examination of under surface pattern for accurate identification, particularly the cinnamon marginal and rhomboidal spot characteristic of B. frigga.

More Details

Etymology

The specific epithet 'frigga' refers to Frigg, a goddess in Norse mythology.

Conservation notes

occurs in specialized bog and tundra that are vulnerable to climate change and drainage. The may make more sensitive to environmental disturbances in consecutive years.