| Family | Nymphalidae |
|---|---|
| Subfamily | Satyrinae |
| Genus | Erebia |
| Species | styx |
| Authority | (Freyer, 1834) |
| English Name | Stygian Ringlet |
| European Red List 2010 | Least Concern (LC) |
|---|---|
| EU 27 Red List 2010 | Least Concern (LC) |
| European Red List 2025 | Least Concern (LC) |
| EU 27 Red List 2025 | Least Concern (LC) |
| Habitats Directive | |
| Bern Convention | |
| CITES |
The Stygian Ringlet occurs on warm, steep, rocky slopes with grassy vegetation and sometimes scattered bushes, often on limestone. Its foodplant is Blue Moor-grass (Sesleria albicans). In Switzerland, it takes two years for the egg to develop into a butterfly. The tiny caterpillar goes into hibernation immediately after leaving the egg, only starting to feed the next spring. In the autumn, they again hibernate, pupating in June or July of the following year. In other areas at lower altitudes, they can complete their life cycle in one year.
Austria / Germany / Italy / Italy: Mainland / Slovenia / Switzerland /