Stylopidae

Definition

A family of twisted-wing parasites (order Strepsiptera) comprising roughly 15 genera and more than 330 described species. Stylopids are obligate endoparasitoids of other insects, primarily bees and wasps (Hymenoptera), with females remaining larviform and permanently embedded within the host, while free-living males possess reduced forewings (pseudohalteres) and enlarged, fan-shaped hindwings. The family represents one of the most species-rich lineages within Strepsiptera and exhibits extreme sexual dimorphism and complex life-history strategies involving host manipulation.

Etymology

From Greek stylos (pillar, column) + -idae (family suffix), referring to the stalk-like body form of the female parasite protruding from the host.

Example

Stylops melittae parasitizes mining bees (Andrena), with the female's cephalothorax protruding between the host's abdominal segments to release first-instar triungulin larvae that seek new hosts.

Related Terms

• Strepsiptera
• triungulin
• endoparasitoid
• Sexual dimorphism
• pseudohaltere
• Xenidae
• Elenchidae
• host manipulation
• Cephalothorax

Usage Notes

Stylopidae is one of several families within Strepsiptera; it is distinguished from related families such as Xenidae and Elenchidae primarily by host associations (bees/wasps versus leafhoppers or other insects) and subtle morphological differences in males. The family name is sometimes encountered in older literature as a broader grouping, but modern taxonomy restricts it to the bee- and wasp-parasitizing clade. Females are never collected free-living; their presence is detected by the exposed cephalothorax or by characteristic changes in host morphology and behavior (stylopization).