Neurochaetidae

Definition

A small family of true flies (order Diptera) distinguished behaviorally by their habit of walking on vertical or steeply inclined surfaces with the head oriented downward—hence their common name, "upside-down flies." The family comprises extant genera restricted to the Old World tropics and subtropics, plus the extinct genus Anthoclusia known from Baltic amber deposits dating to the Eocene–Oligocene boundary.

Etymology

Example

Neurochaetid larvae develop in decaying wood, and adults of Neurochaeta are frequently observed on tree trunks in head-down posture, a trait that separates them from other acalyptrate flies sharing the same microhabitat.

Synonyms

• upside-down flies

Related Terms

• Diptera
• Acalyptratae
• Baltic amber
• Eocene
• Oligocene
• Anthoclusia
• Neurochaeta

Usage Notes

The family is morphologically cryptic and was historically overlooked; its recognition relies partly on the distinctive locomotory behavior. The fossil record, notably Hennig's description of Anthoclusia, provides important calibration points for dating acalyptrate fly diversification. The common name "upside-down flies" is descriptive but not unique to entomologists—context is needed to distinguish from other inverted-walking arthropods.