Echinargus isola

(Reakirt, 1866)

Reakirt's Blue

Echinargus isola, commonly known as Reakirt's , is a small in the . The is to Central America and the extreme southern United States, with regular northward throughout most of the U.S. reaching nearly to the Canadian border. It has been documented visiting flowers of Prairie Clover (Dalea candida) in Colorado, where multiple individuals may congregate on single blossoms. Very rare vagrant records extend into the southern prairies of Canada.

Pronunciation

How to pronounce Echinargus isola: /ˌɛkɪnˈɑːrɡəs ˈaɪsoʊlə/

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Habitat

Shortgrass prairie with flowering plants; associated with prairies containing Dalea candida and other low-growing flora among tall grasses, cacti, and yucca. Observed at elevations of 3,400–7,200 feet in Colorado Range locations.

Distribution

range: Central America and extreme southern United States. Regular migrant throughout most of the United States, approaching the Canada–United States border. Rare vagrant records: southern prairies of Canada (Manitoba, Saskatchewan). Documented in Colorado Springs, Colorado; New Mexico; Texas; and west Texas dunes.

Seasonality

observed in June in New Mexico and Texas; in Colorado, associated with Dalea candida blooming period from June to August. pattern extends activity northward during warmer months.

Diet

feed on nectar. Documented visiting flowers of Dalea candida ( Prairie Clover), Gaillardia, and other composites. Larval plants: not specified in available sources.

Host Associations

  • Dalea candida - nectar sourceMultiple individuals observed on single flower

Behavior

are rapid, active fliers that quickly move between flowers. Multiple individuals have been observed congregating on single blossoms. Migratory documented with regular northward movement throughout the United States.

Ecological Role

of prairie wildflowers, particularly Dalea candida. Participates in with prairie legumes in shortgrass .

Human Relevance

Subject of photography and observation. Documented in citizen science platforms with substantial observation records (18,973 iNaturalist observations). for healthy shortgrass prairie .

Similar Taxa

  • Hemiargus ceraunusFormerly congeneric; Echinargus isola distinguished by genitalic characters and distribution pattern
  • Brephidium exilisSimilar small size and coloration; distinguished by pattern and preference—Brephidium exilis is smaller with more rounded wings and different underwing spotting

More Details

Taxonomic History

Formerly placed in Hemiargus as Hemiargus isola; transferred to Echinargus based on morphological and molecular studies. Basionym Lycaena isola Reakirt, 1866.

Conservation Status

Not formally assessed; appears secure in core range but dependent on prairie preservation.

Tags

Sources and further reading