A wasp is any insect of the order Hymenoptera and suborder Apocrita that is not a bee, sawfly, or an ant. The less familiar suborder Symphyta includes the sawflies and wood wasps, which differ from the Apocrita by having a broad connection between the thorax and abdomen. Also, Symphyta larvae are mostly herbivorous and “caterpillarlike”, whereas those of Apocrita are largely predatory or parasitic.
Most familiar wasps belong to the Aculeata, a division of the Apocrita whose ovipositors are modified into a venomous stinger that includes ants and bees. In this sense, the species called “velvet ants” (Mutillidae) are actually wasps.
A narrower meaning of the term wasp is any member of the Aculeate family Vespidae. This includes the yellowjackets (Vespula, Dolichovespula spp.) and hornets (Vespa spp.).
The following characteristics are present in most wasps:
- Two pairs of wings (exception: female Mutillidae)
- A stinger (only present in females because it derives from the ovipositor)
- Few or no hairs (in contrast to bees); exception: Mutillidae
- Predators or parasitoids, mostly on other insects; some species of Pompilidae, such as the tarantula hawk, specialize in using spiders as a host
Wasps are critically important in natural biocontrol. Almost every pest insect species has a wasp species that is predator or parasite upon it. Wasps are also increasingly used in agricultural pest control.
Mud daubers are a common species of wasp.