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Brephidium exilis

(Western Pygmy-Blue)

Overview

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Interesting Facts

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Common Names

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Common Names in English:

Western Pygmy-Blue

Description

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Family Lycaenidae

'The Lycaenidae are members of the Superfamily Papilionoidea, the true butterflies. Worldwide in distribution, this family has approximately 4,700 species that are unevenly distributed. Coppers are especially dominant in north temperate regions , blues are richest in the Old World tropics and north temperate zones, and hairstreaks are particularly abundant in New World tropics. The adults are typically small to tiny and often brilliantly colored--iridescent blues, bright reds, and oranges. Adults of both sexes have three pairs of walking legs , though most males have fused segments in their front legs. Most adults visit flowers for nectar, but some harvesters feed on wooly aphid honeydew and some hairstreaks feed on aphid honeydew or bird droppings. Females lay single, sea urchin shaped eggs on host leaves or flower buds; the resulting caterpillars are typically slug-shaped. In many species, caterpillars depend on ants for protection, so caterpillars produce sugary secretions that are collected by the ants. Most species overwinter in either the egg or pupal stage.

'[1]

Subfamily Polyommatinae

Blues are tiny to small butterflies of the Family Lycaenidae. Distributed worldwide, they are most diverse in Southeast Asia, tropical Africa, and northern temperate regions . Most of the nearly 50 North American species are found in the west. Adult males are predominantly blue above, due to reflected light rather than pigmentation . Some males and most females are largely brown above. Below, wings of both sexes are usually gray-white with black spots or streaks. Adults in some genera (Euphilotes, Lycaeides, Plebulina, and Icaricia) have more or less prominent orange submarginal bands on their hindwings . Most adults are found near their host plants , and they do not fly long distances , though some tropical and subtropical species undertake long migrations. Adults visit flowers for nectar. Males frequent moist sand and mud , and females lay eggs singly on host plant leaves or flowers. As caterpillars, they secrete sugary secretions that attract ants , and caterpillars of some species are raised in ant nests. Blues usually overwinter in the pupal stage.[2]

Physical Description

Species Brephidium exilis

Tiny. Upperside copper brown with dull blue at the bases of both wings . Underside of hindwing is copper brown with white at the base; fringe mostly white; 3 small black spots near base; row of black spots at outer margin . (ref. 105742)

Color:

Tiny. Upperside copper brown with dull blue at the bases of both wings . Underside of hindwing is copper brown with white at the base; fringe mostly white; 3 small black spots near base; row of black spots at outer margin .

Size/Age/Growth

Wing span : 1/2 - 3/4 inch (1.2 - 2 cm).

Habitat

Alkaline areas such as deserts, salt marshes, and wasteland.

Biology

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Diet

Caterpillar hosts: Pigweed (Chenopodium album), saltbush species (Atriplex), and others in the goosefoot family (Chenopodiaceae). Adult food: Flower nectar.

Reproduction

Males patrol over the host plants all day to find receptive females. Females lay eggs all over the host but particularly on the uppersides of leaves. Caterpillars eat all parts of the plant. Chrysalids hibernate.

Behavior

Flight: July-September in the north, all year in South Texas.

Taxonomy

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Notes

Name Status: Accepted Name .

Similar Species

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Members of the genus Brephidium

ZipcodeZoo has pages for 5 species and subspecies in this genus:

B. exile (Western Pygmy Blue) · B. exilis (Western Pygmy-Blue) · B. exilis isophthalma (Eastern Pygmy Blue) · B. isophthalma (Eastern Pygmy Blue) · B. pseudofea (Eastern Pygmy-Blue)

More Info

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Further Reading

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Notes

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Contributors

Identifiers

Footnotes

  1. http://www.butterfliesandmoths.org/taxonomy?f=16&sci=Lycaenidae&com=Gossamer-wing Butterflies [back]
  2. http://bugguide.net/index.php?q=search&keys=Plebulina&search=Search [back]
Last Revised: 7/16/2012