Aquatic insects and spiders

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Photo of a damselfly nymph on rocks in an aquarium.

Damselfly Larvae

Species in the suborder Zygoptera

Photo of a dragonfly larva resting on a stone.

Dragonfly Larvae

Species in the suborder Anisoptera

Photo of a fishfly larva crawling among rocks in an aquarium.

Fishfly Larvae

Chauliodes, Neohermes, and Nigronia spp. (in eastern US)

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 deer fly larva, probably in a petri dish, on a gray background.

Horse and Deer Fly Larvae

Tabanus, Chrysops, and related genera

Photo of a mayfly naiad crawling on rock underwater

Mayfly Larvae

There are hundreds of species in North America.

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