Which family is associated with true aquatic bugs?

The family associated with true aquatic bugs is Corixidae, commonly known as water boatmen. Members of this family are well-adapted to life in freshwater environments. They possess specialized adaptations that allow them to move efficiently through water, such as a streamlined body shape and oar-like hind legs, which help them swim with ease. Corixidae is known for its ability to feed on algae and detritus in ponds, lakes, and other freshwater habitats, making them an important part of the aquatic ecosystem.

In contrast, the other families listed in the choices have different ecological niches and characteristics. Heptageniidae is a family of mayflies that are primarily associated with flowing waters and are not classified as "true aquatic bugs." Gerridae, known as water striders, are also semi-aquatic and rely on the surface tension of water for locomotion, rather than being fully adapted to underwater living. Ephemerellidae is another family of mayflies that inhabit freshwater systems but, again, do not fit the classification of true aquatic bugs like the Corixidae do. Thus, understanding the specific ecological roles and adaptations of these groups helps clarify why Corixidae is the answer regarding true aquatic bugs.