Elenchidae

Definition

A family of parasitoid insects in the order Strepsiptera, characterized by extreme sexual dimorphism and endoparasitic larval development in host insects, primarily planthoppers (Fulgoroidea) and leafhoppers (Cicadellidae). Females are neotenic, legless, and remain within the host; males are free-living with reduced forewings (halteres) and fan-shaped hindwings.

Etymology

Example

Elenchus tenuicornis, a widespread elenchid, parasitizes delphacid planthoppers in grassland ecosystems, with males emerging to search for female cephalothoraces protruding from host abdomens.

Related Terms

• Strepsiptera
• Parasitoid
• Neoteny
• Cephalothorax
• Haltere
• Stylopidae
• planthopper

Usage Notes

One of the smaller families within Strepsiptera; distinguished from the larger family Stylopidae primarily by host associations and minor morphological details of male antennae and genitalia. The family contains only a few genera, with Elenchus being the most species-rich and broadly distributed.