Long-legged flies

Definition

A large, cosmopolitan family of true flies (Diptera: Brachycera: Dolichopodidae) characterized by conspicuously elongated legs, metallic coloration, and predatory habits. Adults are agile aerial hunters of small arthropods; larvae occupy diverse habitats including soil, decaying vegetation, and aquatic margins. The family comprises more than 8,000 described species in approximately 250 genera, making it one of the most diverse lineages within the lower Brachycera.

Etymology

From English 'long-legged' (referring to the family's diagnostic limb proportions) + 'flies' (common name for Diptera).

Example

The genus Dolichopus, with some 600 species, is the most speciose genus within Dolichopodidae; members of the related genus Condylostylus are frequently observed running on sunlit foliage with their characteristic long legs elevated.

Synonyms

• Dolichopodidae

Related Terms

• Diptera
• Brachycera
• predatory flies
• metallic flies
• empidid flies
• Dolichopus
• Condylostylus

Usage Notes

The common name refers specifically to family Dolichopodidae, not to any long-legged fly in the vernacular sense. Distinguished from empidid flies (dance flies, family Empididae) by the combination of metallic body coloration, longer legs relative to body size, and reduced wing venation. Some regional literature may apply 'long-legged fly' loosely to any dolichopodid or empidid; specialists restrict the term to Dolichopodidae.