Lonchopteridae

Definition

A family of small (2–5 mm), slender Diptera known as spear-winged or pointed-wing flies, characterized by elongated, sharply tapered wings with distinctive venation. The group exhibits widespread geographic distribution and frequent parthenogenesis; males are rare in many populations and differ from females in wing venation pattern.

Etymology

From Greek lonchos (spear, lance) + pteron (wing), referring to the elongated, pointed wing shape characteristic of the family.

Example

Lonchoptera bifurcata, a common parthenogenic species in this family, can be identified by the characteristic forked vein near the wing tip that gives the spear-winged flies their name.

Synonyms

• Spear-winged flies
• pointed-wing flies

Related Terms

• Diptera
• Parthenogenesis
• wing venation
• Lonchoptera
• Brachycera

Usage Notes

Specialists distinguish Lonchopteridae from other small dipteran families by the combination of pointed wings, reduced wing venation, and the frequent absence of males in field collections. The family is sometimes overlooked in surveys due to its small size and resemblance to minute black scavenger flies (Scathophagidae or lesser dung flies), but the distinctive lanceolate wing shape separates them upon close examination.