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The Common Water Strider is water bug that looks a lot like a big mosquito walking on the surface of the water.
Its body can grow just over 1/2 inch long and is dark brown or black. Like all insects, it has six legs. The front pair of legs is short, and the middle and back legs are very long.
Water striders live on the surface of ponds, slow streams, marshes, and other quiet waters.
Common Water Striders eat living and dead insects on the surface of the water. Some are aquatic (water) insects, such as mosquito larvae coming up from the bottom, and others are terrestrial (land) insects, such as butterflies or beetles that accidentally land on the surface.
Injured dragonflies are a favorite food, as are worms that fall in the water. Water striders have a sharp mouthpart, called a rostrum, to suck up body juices from prey.
Fossil Water Strider (Gerridae family) in the Green River Formation. This specimen lived during Eocene time, about 50 million years ago. These fossils are unusually well preserved in laminated limestone precipitated from calcium-rich waters. The limestone is interbedded with many thin layers of volcanic ash and mudstone. Fossil Butte National Monument. Near Kemmerer, Lincoln Co., Wyo.