Epargyreus

Hübner, 1819

Silverdrops, Flasher butterflies

Epargyreus is a of in the , commonly known as silverdrops or flasher butterflies. The genus name derives from Greek argyros meaning 'silver,' referring to the characteristic spot on the . occur across the Nearctic and , with the best-known species being Epargyreus clarus (silver-spotted skipper), which ranges from southern Canada through the United States to South America. construct distinctive leaf shelters using and are known for '-shooting' —expelling excrement up to 40 times their body length away from their shelters.

Epargyreus clarus by (c) christine123, some rights reserved (CC BY), uploaded by christine123. Used under a CC-BY license.

Silver-spotted skipper - Epargyreus clarus huachuca - Flickr - gailhampshire (1) by gailhampshire from Cradley, Malvern, U.K. Used under a CC BY 2.0 license.

MZLU-00129566 dorsal (51092576691) by NSG group from Lund, Sweden. Used under a CC0 license.

Pronunciation

How to pronounce Epargyreus: /ɛˌpɑrˈdʒɪriəs/

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Identification

The is distinguished by the presence of a large or silvery spot on the surface of each , from which the 'silverdrops' derives. Members are relatively large with bodies. -level identification requires examination of patterns, , and geographic distribution. Epargyreus clarus is particularly recognizable by its dark wings with golden- and the prominent silver-white on the hindwing underside.

Images

Distribution

The occurs in the Nearctic and . Individual have distinct ranges: Epargyreus clarus extends from southern Canada through the United States to Mexico and South America; E. zestos occurs in Florida and the Antilles; E. exadeus ranges from Guatemala through Central America to Brazil and Argentina; and other species are restricted to specific regions such as Jamaica (E. antaeus), Mexico (E. aspina, E. brodkorbi, E. orizaba), and Argentina (E. tmolis).

Host Associations

Fabaceae - larval feed on various legumes; Epargyreus clarus has been documented on soybean (Glycine max), black (Robinia pseudoacacia), kudzu (Pueraria montana), and other Fabaceae
Soybean (Glycine max) - larval Epargyreus clarus occasionally found on soybean but rarely reach economically damaging levels
Black locust (Robinia pseudoacacia) - larval Documented for Epargyreus clarus
Kudzu (Pueraria montana) - larval Accepted ; show no preference between kudzu, black , or red oak for shelter construction

Life Cycle

The exhibits with both non-diapausing summer and diapausing winter generations. construct elaborate leaf shelters by cutting leaves and lashing them together with , forming structures described as 'tepees,' 'bungalows,' or 'condominiums.' occurs within these shelters. Summer generation pupal duration is 10–14 days, while winter generation for several months. pupae survive at significantly higher rates than summer pupae despite longer exposure periods.

Behavior

are notable for '-shooting' —extruding their hind ends from shelters to propel excrement up to 40 times their body length away, potentially to avoid attracting . Larvae hide in -constructed leaf shelters during daylight hours and emerge at night to feed. exhibit rapid, darting typical of .

Ecological Role

function as on leguminous plants, with occasional presence in agricultural soybean fields. The contributes to as visit flowers. Larval leaf shelters and -shooting represent anti- .

Human Relevance

Epargyreus clarus is among the most widespread and recognizable North , valued by watchers. occasionally occur in soybean fields but rarely cause . The has been studied for its pupal survival , revealing counterintuitively higher mortality during short summer than long winter .

Similar Taxa

Other Hesperiidae generaMay share general but lack the characteristic large silver- spot on the that defines Epargyreus
UrbanusAnother Eudaminae with similar body form but different pattern; lacks prominent silver spot

More Details

Etymology

The name Epargyreus combines Greek elements, with argyros meaning 'silver' referring to the spot on the

Species diversity

The contains approximately 20 recognized , with Epargyreus clarus being the most widespread and well-studied

Pupal survival paradox

Research by Brackley and Weiss (2023) demonstrated that of Epargyreus clarus survive at higher rates (65% maximum mortality) than summer pupae (75% mortality in just 10 days), despite months-long exposure versus days-long exposure. Daily per mortality rates were an of magnitude higher in summer, attributed to increased vertebrate activity.