Half-moon Hairstreak
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Satyrium semiluna

Habitat

Shrub-Steppe
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Status

Endangered (Federal)
Red List (Provincial)

Description

Adult butterflies have a wingspan of approximately 3 cm (1.5 in). The top side of the wings are drab brown or blackish-brown. The undersides of the wings are grayish-brown featuring a few black spots, slightly edged with white scaling. Caterpillar larvae are light green with jagged whitish stripes and a dark brown head.

Adults fly from late May to early July. They are found in unforested Sagebrush/Bluebunch Wheatgrass habitat in the south Okanagan Valley between 600 and 1100 m elevation where Silky and Sulphur Lupine plants are present. Halfmon Hairstreaks may have a mutualistic relationship with certain ant species.

Threats

-Agricultural and urban development of habitat
-Invasive plants
-Intensive livestock grazing
-Fire suppression leading to forest encroachment and ingrowth

You Can Help!

-Protect and conserve wildlife habitat
-Control and/or remove invasive plants and reduce soil disturbance to prevent invasive plants from establishing
-Reduce livestock grazing
-Consult with professionals about developing and implementing a prescribed burn.

Resources

Photo: Lisa Scott
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Photo: Neve Carlile
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