Picture-winged flies

Definition

A large cosmopolitan family of true flies (Diptera: Ulidiidae) distinguished by striking wing patterns of dark bands, spots, or reticulations that function in species recognition and courtship displays. Members of this family, along with certain Tephritidae and other Tephritoidea, share this visual trait, though Ulidiidae are reliably identified by a smoothly curving subcostal vein rather than the sharply angled vein of Tephritidae, and they lack the pronounced posteroapical anal cell projection seen in some fruit flies. Most species are herbivorous or detritivorous, with larvae developing in decaying vegetation, fungi, or plant stems; a minority are significant agricultural pests.

Etymology

From the distinctive patterned wings used in visual signaling; family name Ulidiidae derived from Greek 'oulis' (scar or wound), referring to wing markings.

Example

Tetanops myopaeformis (sugarbeet root maggot) and Euxesta stigmatias (corn silk fly) are economically damaging picture-winged flies whose larvae attack crop roots and ears, respectively, while the widespread genus Chaetopsis breeds in rotting cactus and agave.

Synonyms

• Ulidiidae

Related Terms

• Tephritidae
• Tephritoidea
• Diptera
• anal cell
• subcostal vein
• herbivory
• detritivory
• sugarbeet root maggot
• corn silk fly

Usage Notes

The common name is shared with certain Tephritidae and other Tephritoidea, so precise identification requires examination of wing venation—particularly the subcostal vein curvature and anal cell shape—rather than pattern alone. In agricultural contexts, 'picture-winged fly' often specifically denotes pestiferous Ulidiidae.