; order Hemiptera, suborder Heteroptera)
Family of aquatic bugs which live submerged, breathing through a bristle-like, tubular tail that reaches the surface. Being poor swimmers, they lie in wait for their prey, which they seize with the front pair of legs. They live in still or slow-moving waters. There are about 200 species, occurring on all continents.
Subjects: Zoology and Animal Sciences.