Large blue

The large blue (Phengaris arion) is a species of butterfly in the family Lycaenidae. The species was first defined in 1758 and first recorded in Britain in 1795. In 1979 the species became mostly extinct in Britain but has been successfully reintroduced with new conservation methods. The species is classified as "near threatened" on the IUCN Red List of Threatened Species. Today P. arion can be found in Europe, the Caucasus, Armenia, western Siberia, Altai, north-western Kazakhstan and Sichuan.

Large blue
Upperside
Underside

Endangered  (IUCN 2.3) (Europe)
Scientific classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Lepidoptera
Family: Lycaenidae
Genus: Phengaris
Species:
P. arion
Binomial name
Phengaris arion
Synonyms
  • Papilio arion Linnaeus, 1758
  • Glaucopsyche arion (Linnaeus, 1758)
  • Maculinea arion (Linnaeus, 1758)
  • Nomiades arion

The large blue can be distinguished by its unique speckled black dots on its wings with a blue background.

The large blue butterfly is well known in behavioural ecology as it is a brood parasite of a single species of red ant, Myrmica sabuleti.

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