Gerroidea

thumb|Nymph in Cyprus thumb|Walking on water surface; the dark blobs are shadows cast by water disturbances around each of the six legs touching the water.

Veliidae is a family of gregarious predatory insects in the suborder Heteroptera. They are commonly known as riffle bugs, small water striders, or broad-shouldered water striders because the segment immediately behind the head is wider than the rest of the abdomen. Species of the genus Rhagovelia are also referred to as ripple bugs.

Gerroidea is a superfamily of semiaquatic bugs in the order Hemiptera. There are at least 3 families and more than 2,000 described species in Gerroidea. thumb|Gerridae