Braconidae

Definition

A family of small to medium-sized parasitoid wasps (order Hymenoptera) characterized by relatively short antennae (usually with 16 or fewer segments), reduced wing venation, and larvae that develop as endoparasitoids or ectoparasitoids of other arthropods, primarily insects. Braconidae constitute the second-largest family in Hymenoptera after Ichneumonidae, with approximately 17,000 described species and estimates suggesting 30,000–50,000 species total. Members are distinguished from ichneumonids by forewing venation patterns, absence of an areolet (a small cell in the forewing), and typically shorter ovipositors relative to body length. The family exhibits extensive host specificity, with individual species often restricted to particular host taxa or developmental stages.

Etymology

From Bracon (type genus, named for French entomologist César-Auguste Bracon) + -idae (family suffix)

Example

Cotesia congregata, a braconid wasp, parasitizes caterpillars of the tobacco hornworm (Manduca sexta); the female wasp lays multiple eggs within a single host, and the emerging larvae spin conspicuous white cocoons on the exterior of the still-living caterpillar before pupating.

Related Terms

• Ichneumonidae
• Parasitoid
• Hymenoptera
• Biological control
• koinobiont
• idiobiont
• Cotesia
• Aphidius
• Microplitis

Usage Notes

The term 'braconid' (singular or plural) refers to individual wasps in this family. Braconidae are frequently contrasted with Ichneumonidae: braconids are generally smaller, have fewer antennal segments, lack the areolet wing cell, and often possess more host-specific associations. In applied entomology, braconids are among the most important biological control agents; however, their high host specificity means that successful biocontrol requires precise matching of parasitoid to pest species. The family is divided into numerous subfamilies (e.g., Aphidiinae, Braconinae, Microgastrinae) with varying life-history strategies—some are koinobionts (allowing host development to continue after parasitism) and others are idiobionts (arresting host development immediately).