What dual adaptation allows Belostomatidae to carry an oxygen supply while submerged underwater?

Trapping a silvery bubble of air beneath their wings

The respiration method of the Belostomatidae family demonstrates a fascinating physiological adaptation for their semi-aquatic existence. While they breathe atmospheric air, they do not rely solely on constant surfacing. They possess abdominal appendages that can function as siphons or breathing tubes, which are extended to the water surface to draw in air. Crucially, they also have the ability to maintain an oxygen reserve while submerged by trapping a visible, silvery bubble of air. This air is held between the hardened forewings (hemelytra) and the softer hindwings. This ability to store oxygen beneath the wings allows these active predators extended periods underwater necessary for hunting and maneuvering in their aquatic environments.