Enconter with the Green-underside Blue

Spring days in the Mediterranean region in May are ideal for observing butterflies and other insects, because during this period most of the plants are in full blossom. Therefore, I try not to miss any potential day for wandering with my dog in search of opportunities for a good picture. During one of these sunny and warm days of May, while trekking on Marlera, I spotted a beautiful sample of Glaucopsyche alexis or, Green-underside Blue, a member of the Lycaenidae family. It was resting on a herbaceous plant, most probably  of the Linum genus. However, their life history is accomplished on several members of the Fabaceae family and the larvae are attended by various ant species, as typical for this family of butterflies. This species is widespread and common in many European regions, and it can be easily recognised by the metallic greenish-blue flush on the light-grey hind underside wing. In the specimen on the picture (Photo 1 and 2) it is extended to the edge but in some populations it can be reduced.

Farfallinasmll
Photo 1. A specimen of Glaucopsyche alexis resting on a plant of the Linum genus; Salvia pratensis can be seen in the foreground.
Glal
Photo 2. Glaucopsyche alexis seen in more detail: the blue-green basal flush extends to the margin.

The shiny green-bluish flush is actually a structural colour, which means that the way we see it is the consequence of how light reflects off a surface of the wing which is made of tiny scales. Watch here for more info: http://news.nationalgeographic.com/news/2010/06/photogalleries/100624-butterfly-wing-colors-scales-pictures/

Glaucopsyche
Foto 3. A male resting on a dry pep with seeds. Females´upperside is usually brown, with the blue flush present only in the basal region, which can be qute extensive in some populations.

Curiosities:

  • Eggs are laid on a flower which will later be eaten by the larvae. The colour of the larvae is variable and depends on the colour of the flower they feed on. It can be greenish, dusky-pink or even bright yellow if they consumed the yellow flowers of Spartium junceum.
  • Larvae is whitish prior the pupation and at this stage it is attended by various ant species (Lasius, Formica, Myrmica, Camponotus etc.).

Photos by Ingrid Ugussi Vukman

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