Not found in the UK.

Size and Family

  • Family: Blues
  • Size: Small / Medium
  • Wing Span Range (male to female): 30-36mm

Conservation Status

  • Butterfly Conservation priority: Low                    
  • European Status: Vulnerable

Caterpillar Foodplants

Caterpillars feed on Marsh Gentian (Gentiana pneumonanthe)

Habitat

Damp meadows below 1000m

Distribution

  • North Portugal, west Pyrenees, much of France and eastwards across Germany and to northern Greece. 
  • Distribution Trend Since 1970s: N/A
Alcon Blue (underwing) - Kasia Bukowska

Alcon Blue (underwing)

Alcon Blue (male/underwing) - Nigel Kiteley

Alcon Blue (male/underwing)

Alcon Blue (underwing) - Kasia Bukowska

Alcon Blue (underwing)

Alcon Blue (underwing) - Ilia Ustyantsev

Alcon Blue (underwing)

Alcon Blue (eggs) - Ilia Ustyantsev

Alcon Blue (eggs)

Alcon Blue (eggs on Cross Gentian) - Marcell Kárpáti

Alcon Blue (eggs on Cross Gentian)

Alcon Blue (eggs) - Ilia Ustyantsev

Alcon Blue (eggs)

Alcon Blue (egg) - Ilia Ustyantsev

Alcon Blue (egg)

Alcon Blue (egg) - Marcell Kárpáti

Alcon Blue (egg)