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Photo of a spotted fishing spider perched on the water's surface amid floating duckweed plants

Aquatic Spiders

Dolomedes spp., Tetragnatha spp., and others

Photo of caddisfly larva with case made of detritus

Caddisfly Larvae

Various species in the order Trichoptera

Photo of a giant water bug

Giant Water Bugs

Species in the genera Abedus, Belostoma, and Lethocerus

Venomous

Photo of hellgrammite

Hellgrammite

Corydalus cornutus

Photo of a predaceous diving beetle

Predaceous Diving Beetles (Water Tigers)

Species in the beetle family Dytiscidae

Photo of stonefly naiad on a rock underwater

Stonefly Larvae

There are hundreds of species in North America

Photo of a collared water scavenger beetle showing back.

Water Scavenger Beetles

Beetles in the family Hydrophilidae

Photo of a water scorpion, genus Ranatra, captured in a jar of pond water.

Water Scorpions

Ranatra spp. and Nepa apiculata

Photo of a single water strider

Water Striders

Aquarius remigis; also species in the genus Gerris

Photo of a whirligig beetle viewed from above

Whirligig Beetles

Species in the beetle family Gyrinidae