Brephidium exilis
(Boisduval, 1852)
Western Pygmy Blue, Pygmy Blue
Brephidium exilis, commonly known as the Western Pygmy Blue, is the smallest in North America. Despite its diminutive size, it is widespread and relatively common across its range, though often overlooked due to its minute stature. The species belongs to the Lycaenidae (gossamer-winged butterflies) and is recognized as a synonym of Brephidium exile.
Pronunciation
How to pronounce Brephidium exilis: //brɛˈfɪdiəm ˈɛksaɪl//
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Identification
The Western Pygmy Blue is distinguished by being the smallest in North America, with a wingspan so small that approximately ten specimens of the tiny "Bling " (Strobisia iridipenella, wingspan ~3 mm) could fit on a single wing. This extreme miniaturization makes it easily overlooked in the field despite its relative abundance. Specific wing patterns and coloration are not detailed in available sources.
Distribution
North America; South America; Hawaii, United States. The has been recorded across a broad geographic range including continental North America, South America, and as an introduced or established in Hawaii.
Host Associations
- Amaranthaceae - larval plantLarvae feed on various weedy members of the pigweed , particularly saltbush (Atriplex)
Similar Taxa
- Brephidium isophthalmaEastern Pygmy Blue, the other in the Brephidium, with which it shares the distinction of being among the smallest butterflies in North America; distinguished by geographic range and subtle morphological differences
- Hemiargus isolaReakirt's Blue, often found in similar and regions; much larger in size, allowing for easy differentiation
More Details
Taxonomic Note
The was originally described as Brephidium exile by Boisduval in 1852. Current recognizes Brephidium exilis as the accepted name, with Brephidium exile listed as a synonym. The GBIF taxonomy match indicates this species has a synonym status in some databases, reflecting ongoing nomenclatural refinement.
Conservation Status
Despite its small size and potential vulnerability, the Western Pygmy Blue is considered common and widespread. Its association with weedy plants in disturbed may contribute to its ecological compared to with narrow habitat requirements.