Phengaris alcon

English name:
Alcon Blue
Full scientific name:
Phengaris alcon (Denis & Schiffermüller, 1775)
Croatian name:
Gorski (močvarni) plavac

Red Book Category in EU: LC

Red Book Category in Croatia: VU

Wings span: 29-35 mm

Phengaris alcon, Velebit, 0621L3736
Phengaris alcon, Velebit, 0621L3736
Phengaris alcon, Poštak, 0721L2464
Phengaris alcon, Poštak, 0721L2464

Flight Period and Life Cycle

Flight period of Phengaris alcon in Croatia
Flight period of Phengaris alcon in Croatia

1 brood per year.

Distribution in Croatia

Distribution of Phengaris alcon in Croatia
Distribution of Phengaris alcon in Croatia

More common in mountains. Check the included map.

External Morphology Characteristics

In males, the upper side of both wings is blue with a thin and dark border on the forewings. In females, the upper side of both wings is brown with bluish basal and discal zones of the forewing. The underside of both wings is greyish-brown. There is a series of prominent dark spots in discal zone of both wings. The series of spots in the marginal zone is pale. The cell spot of the forewing is visible in some individuals.

Behavior

Imago feeds with nectar of various flowers. It is often found resting on grass or leaves with closed wings.

Caterpillar Host Plants

Gentiana cruciata and Gentiana pneumonanthe

Habitat

Meadows at edges of woodland and bushes. Elevations: 200-1400m.

Gallery

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