| Family | Lycaenidae |
|---|---|
| Subfamily | Polyommatinae |
| Genus | Lysandra |
| Species | bellargus |
| Authority | (Rottemburg, 1775) |
| English Name | Adonis Blue |
| European Red List 2010 | Least Concern (LC) |
|---|---|
| EU 27 Red List 2010 | Least Concern (LC) |
| European Red List 2025 | Near Threatened (NT) |
| EU 27 Red List 2025 | Near Threatened (NT) |
| Habitats Directive | |
| Bern Convention | |
| CITES |
The Adonis Blue is found on calcareous soil on moderately to very sparse grassland, that is often sheltered by neighbouring woods or shrub. Its foodplants are Horseshoe Vetch (Hippocrepis comosa) and Crown Vetch (Coronilla varia), and the eggs are laid on the leaves. It pupates in the litter layer. The caterpillars are attended by ants of the genera Myrmica, Lasius, Plagiolepis, Tetramorium, Formica, and Tapinoma. The Adonis Blue usually has two generations a year, and the caterpillars of the second brood hibernate. There are also some single-brooded populations in the south of Greece.
Albania / Andorra / Austria / Belarus (Possibly Present) / Belgium / Belgium: Wallonia / Bosnia and Herzegovina / Bulgaria / Croatia / Czechia / Estonia (Irregular Vagrant) / France / France: Mainland / Germany / Greece / Greece: Mainland / Hungary / Italy / Italy: Mainland / Liechtenstein / Lithuania (Irregular Vagrant) / Luxembourg / North Macedonia / Moldova / Montenegro / Poland / Portugal / Portugal: Mainland / Romania / European Russia / Serbia / Serbia: Serbia / Serbia: Kosovo / Slovakia / Slovenia / Spain / Spain: Mainland / Spain: Balearic Islands / Switzerland / European Türkiye / Ukraine / United Kingdom / United Kingdom: Great Britain /