Efferia varipes
(Williston, 1885)
Colorado Hammertail
Efferia varipes is a of robber fly in the Asilidae, commonly known as the Colorado Hammertail. The species belongs to the large and diverse Efferia, which contains numerous species across North and South America. Robber flies in this genus are predatory insects that capture other insects in . The specific epithet 'varipes' refers to variable legs, suggesting some morphological variation in this character.
Pronunciation
How to pronounce Efferia varipes: /ˈɛf.ɛr.i.ə ˈvær.ɪˌpiːz/
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Distribution
Based on iNaturalist records, Efferia varipes has been observed in the United States, with observations concentrated in Colorado and adjacent areas. The 'Colorado Hammertail' suggests a primary association with this region. The Efferia broadly occurs across North and South America, with many showing regional or restricted distributions.
More Details
Taxonomic Notes
Efferia is a large of robber flies historically treated as part of a broader Efferia group that included related genera such as Triorla. Some taxonomists have advocated for splitting Efferia into multiple genera based on morphological and phylogenetic evidence. The E. varipes was described by Samuel Wendell Williston in 1885, an early American dipterist who made substantial contributions to the of flies and other insects.