; class Insecta, subclass Pterygota)
Order of insects in whose life cycle there is no true pupal stage, and which never have an eleventh abdominal segment or cerci. The mouth-parts are modified into a rostrum or, in non-feeding stages of some species, are completely lacking. There are typically two pairs of wings, of which the anterior pair are usually wholly or partly toughened to protect the membranous posterior pair over which they are folded at rest. There are two suborders, Homoptera and Heteroptera.
Subjects: Zoology and Animal Sciences.