Dryinidae

Definition

A cosmopolitan family of solitary wasps in the order Hymenoptera whose larvae are ectoparasitoids or endoparasitoids of nymphs and adults of Auchenorrhyncha (leafhoppers, planthoppers, treehoppers, and cicadas). Adult females of many species possess a distinctive chela (pincer-like foreleg) used to grasp hosts, and some larvae emerge to spin a silken cocoon attached externally to the still-living host. The family comprises over 1,900 described species across 11 extant subfamilies and 57 genera, including the type genus Dryinus.

Etymology

From Greek drys (oak); Latreille named the type genus Dryinus because the first described species was collected on an oak tree in Spain.

Example

Dryinid wasps such as those in the genus Gonatopus are important biological control agents of rice planthoppers (Nilaparvata lugens) in Asian agroecosystems, with females using their raptorial forelegs to capture mobile hosts.

Related Terms

• Hymenoptera
• Auchenorrhyncha
• Parasitoid
• ectoparasitoid
• endoparasitoid
• Biological control
• Chela
• Strepsiptera
• Embolemidae

Usage Notes

Treat as plural in formal taxonomic usage ('Dryinidae are...'), though family-level names are grammatically plural in Latin. Distinguished from the related family Embolemidae by antennal segmentation and larval development mode. The chelate foreleg of females is a key diagnostic feature but is reduced or absent in some genera and in all males. Dryinidae are often cited alongside Strepsiptera as major parasitoid groups targeting Auchenorrhyncha, but differ in host relationships and larval development.