Hydrometroidea

left|thumb|Hydrometra strigosa Hydrometridae is a family of semiaquatic insects, known as marsh treaders or water measurers. They have a characteristic elongated head and body which makes them resemble a yardstick for measuring the water surface.

species of insect

Hydrometra is a genus of water measurers in the family Hydrometridae. There are more than 120 described species in Hydrometra.

Macroveliidae is a family of macroveliid shore bugs in the order Hemiptera. There are at least four genera in Macroveliidae.

species of insect

species of insect

species of insect