Which heteropterans can walk across the surface of water?

Semiaquatic heteropterans are capable of walking on water because they are supported by the surface film of the water. Their small, slender bodies and long, thin legs allow them to distribute their weight, with their tarsi causing only slight indentations in the surface. These insects are protected from wetting by a dense, water-repellent pile that traps a thin layer of air around their bodies.1

Several families of heteropterans are known for this ability, including:

• Water striders (family Gerridae)12
• Smaller water striders (family Veliidae)1
• Marsh treaders (family Hydrometridae)1
• Water treaders (family Mesoveliidae)1

While these surface dwellers are specifically adapted for life on the water film, other groups, such as shore bugs (family Saldidae), may occasionally make short forays onto the water's surface, though they are typically heavier-bodied and better suited for running across land or rocks.1