Home / Gossamer-Winged (Lycaenidae) / Mazarine Blue (Polyommatus semiargus)

Mazarine Blue (Polyommatus semiargus)

Mazarine Blue Butterfly source: en.wikipedia.org

The Mazarine Blue is a species of very small butterflies and are spread across their habitat in nine regional subspecies. Butterfly watchers find is specifically interesting when the grass fields and meadows seem to be studded with these tiny butterflies hanging around, especially between Mid-June and mid-July.

Scientific Classification

  • Family: Lycaenidae
  • Genus: Polyommatus
  • Scientific Name: Polyommatus semiargus

Description and Identification


Mazarine Blue Butterfly Caterpillar source: ukbutterflies.co.uk

The larvae emerge after the eggs hatch after one to two weeks. The mature larva is yellowish green in color for the purpose of camouflaging in the leaves, and has very fine hairy structures, as also, dark brown spiracles throughout the body. It overwinters as a young larva.


Mazarine Blue Butterfly Pupa source: ukbutterflies.co.uk

The chrysalis is olive green in color, and, like most other species, is attached to its host plant with the help of silk girdle.

Adult Butterfly

Sexual Dimorphism: Distinctly visible

Color and Appearance: When the wings are open, the females display a shiny brown hue, whereas the males have a shiny blue coloration, having thin reddish black edges alongside dark and pronounced wing-veins. When the wings are closed, both the sexes show a light grey to faint brown color with black blotches bordered by white. There are also fine turquoise scales in the basal area in both the sexes.

Mazarine Blue Butterfly Female source: cherrug.se

Mazarine Blue Butterfly Male source: learnaboutbutterflies.com

Average wingspan: 32–38 mm

Flight pattern: Fast and erratic


Mazarine Blue Butterfly Eggs source: ukbutterflies.co.uk

Small and pure white in color, and looks like miniature sea urchins; laid one at a time on the host leaf or flower heads (mostly Red Clover).

Quick Facts

Distribution Varies between subspecies; across several European countries, Spain, Morocco, Japan, etc., but most common in southern and central Finland
Habitat Meadows, grasslands, pastures, flowery and grassy humid areas
Host plants Mainly Red Clover (Trifolium pratense), different species of Trifolium (including Trifolium medium and Trifolium spadiceum), also, Vicia cracca, Melilotus, Anthyllis, and Genista
Adult diet Flower nectar

Did You Know?

  • The species was once found in the southern part of England but is now extinct in the British Isles.
  • The female of the species is often confused for the Small Blue butterfly (Cupido minimus) by the butterfly watchers, while the males are particularly confused for the Holly Blue (Celastrina argiolus).

Mazarine Blue Butterfly Images source: i.pinimg.com

Mazarine Blue source: ukbutterflies.co.uk

Polyommatus semiargus source: guypadfield.com

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Scientific Classification

  • Family: Lycaenidae
  • Genus: Polyommatus
  • Scientific Name: Polyommatus semiargus
Published by Poppy Glendening on November 29, 2018.
Last Updated: October 15, 2023. ✅ Verified by: Butterfly Team