Anisopodidae

Definition

A small cosmopolitan family of nematoceran Diptera (wood gnats, window-gnats) comprising roughly 150 described extant species in 15 genera. Adults are generally small to medium-sized, gnat-like flies; the genera Olbiogaster and Lobogaster are exceptions, being large with spatulate abdomens. Larvae are typically saprophagous or fungivorous in decaying wood, fungi, or other organic matter. Phylogenetic placement remains disputed: traditionally considered the sister group to Brachycera (higher flies), though some treatments split the group into four separate families (Anisopodidae sensu stricto, Mycetobiidae, Olbiogastridae, and Valeseguyidae).

Etymology

From Greek anisos (unequal) + podos (foot), referring to leg structure; family name formed with standard -idae suffix.

Example

Larvae of Sylvicola (wood gnats) develop in decaying logs and fungal fruiting bodies, making them useful indicators of forest decomposition processes and saproxylic habitat quality.

Synonyms

• wood gnats (common name)
• window-gnats (common name)

Related Terms

• Diptera
• Nematocera
• Brachycera
• saprophagy
• Fungivory
• saproxylic
• Olbiogaster
• Sylvicola
• Mycetobiidae
• Valeseguyidae

Usage Notes

The family boundaries are unstable; literature before ~2010 may use Anisopodidae in the broad sense to include what are now treated as separate families. Check contemporary sources for current circumscription. Not to be confused with Anisopoda, a genus of harvestmen (Opiliones).