Thor's Fritillary
CR

Thor's Fritillary

Boloria thore

UnknownLCEULCEU

Photo: Wikimedia Commons (CC) via https://en.wikipedia.org/wiki/Boloria_thore

Overview

A detailed profile for this species is sourced from the IUCN Red List of Threatened Species as assessments become available.

Thor's Fritillary faces severe population declines due to habitat loss and fragmentation of its specialized alpine and subalpine environments. Climate change poses an additional critical threat as warming temperatures force this cold-adapted species to retreat to increasingly limited high-elevation refugia. The species' dependence on specific host plants and narrow ecological requirements make it particularly vulnerable to environmental changes.

Threat summary

Habitat

Alpine and subalpine meadows, grasslands, and heath communities typically above 1,000 meters elevation, often associated with areas containing violet species (Viola) which serve as larval host plants. The species inhabits cool, moist mountain environments with short growing seasons in northern Europe and high-altitude regions.

Other threatened species in Nymphalidae

Scarce FritillaryCR

Scarce Fritillary

Euphydryas maturna

Unknown
EN

Altopedaliodes albonotata

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Two-tailed Pasha

Charaxes jasius

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False Grayling

Arethusana arethusa

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Frequently asked questions

Why is Thor's Fritillary classified as Critically Endangered?
Thor's Fritillary is classified as Critically Endangered — facing an extremely high risk of extinction in the wild — because population sizes are very small, declining sharply, or restricted to a tiny range. Thor's Fritillary faces severe population declines due to habitat loss and fragmentation of its specialized alpine and subalpine environments. Climate change poses an additional critical threat as warming temperatures force this cold-adapted species to retreat to increasingly limited high-elevation refugia. The species' dependence on specific host plants and narrow ecological requirements make it particularly vulnerable to environmental changes.
Where does Thor's Fritillary live?
Thor's Fritillary occurs in across multiple regions. Country-level distribution data is sourced from the IUCN Red List and cross-referenced with GBIF occurrences.
What are the main threats to Thor's Fritillary?
The main threats to Thor's Fritillary are ai-1, ai-2, ai-3, and ai-4. The full IUCN-classified threat record for this species is detailed on the species page.

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