Ormyridae

Definition

A small family of parasitic wasps in the superfamily Chalcidoidea (Hymenoptera), comprising approximately 153 species worldwide. Ormyrids function as primary parasitoids or hyperparasitoids, attacking gall-forming insects—primarily cynipid gall wasps and tephritid fruit flies—within plant galls. The family has cosmopolitan distribution except for near-complete absence from South America, with most species placed in the genus Ormyrus.

Etymology

From the type genus Ormyrus (Greek ormyros, of uncertain derivation, possibly related to 'stirring' or 'excitement', perhaps alluding to wasp activity).

Example

An Ormyrus species may locate a cynipid gall wasp larva inside an oak apple gall, oviposit through the gall tissue, and develop as a solitary parasitoid, with some species acting as tertiary hyperparasitoids by attacking other parasitoids already present in the gall.

Related Terms

• Chalcidoidea
• Parasitoid
• hyperparasitoid
• gall wasp
• Cynipidae
• Tephritidae
• inquiline
• gall community

Usage Notes

Distinguished from other chalcidoid families by their association with gall communities and their relatively robust body form. The family is taxonomically stable but species-level identification often requires examination of wing venation and male genitalia. Absence from South America represents a notable biogeographic pattern among chalcidoid families.