Thick-headed flies

Definition

A family (Conopidae) of brachyceran flies within the superfamily Conopoidea, characterized by an enlarged, rounded head capsule that gives the group its common name. Adults are frequent flower visitors with elongated proboscises adapted for nectar feeding; many species exhibit striking Batesian mimicry of Hymenoptera, particularly wasps and bees, through black-and-yellow or black-and-white coloration. The family comprises approximately 800 described species in 47 genera with cosmopolitan distribution excluding polar regions and many Pacific islands.

Etymology

From the characteristic expanded, rounded head capsule prominent in adults; family name Conopidae from Greek konops (mosquito or gnat).

Example

Conopid larvae are obligate endoparasitoids of bees and wasps, with females forcibly depositing eggs into the host abdomen during flight; the developing larva consumes the host from within, eventually killing it.

Synonyms

• Conopidae
• conopids

Related Terms

• Diptera
• Brachycera
• Batesian mimicry
• endoparasitoid
• flower visitation
• Syrphidae

Usage Notes

The common name refers specifically to head morphology and should not be confused with similarly mimetic Syrphidae (hoverflies). Conopidae is the sole family in superfamily Conopoidea, making it phylogenetically isolated among brachyceran lineages. In field contexts, adults are distinguished from mimetic syrphids by the distinctly bulbous head and reduced wing venation.