Alcon Large Blue
Common NameAlcon Large Blue
Scientific NamePhengaris alcon
FamilyLycaenidae
SubfamilyPolyommatinae
Wingspan (mm)30
Wing Patternspotted
Primary Colorslight brown, black, blue
HabitatDamp grasslands, fens, meadows, forest clearings
Geographic RangeEurope, Russia, Central Asia
Host PlantsGentiana pneumonanthe, Gentiana asclepiadea
Flight PeriodJune to August
Flight Stylefluttering
Conservation Statusnear-threatened
Lifecycle NotesThe larvae initially feed on the flowers and seeds of gentian plants, then drop to the ground and are adopted by specific Myrmica ant species, which carry them into their nests. Inside the ant nest, the larvae are predatory, feeding on ant larvae until pupation.
Identification TipsLook for the distinctive pattern of black spots ringed in white on the light brown underside of the wings. The upperside is typically blue, more intensely so in males. It is usually found in habitats where its host plants (Marsh Gentian or Willow Gentian) and specific Myrmica ant species are present.
Description
This small to medium-sized butterfly has a light brown or beige underside with prominent black spots, often ringed in white. The upperside, particularly in males, is a vibrant blue.
