Aquatic insects and spiders

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Photo of an alderfly larva among rocks and gravel in an aquarium.

Alderfly Larvae

Sialis spp.

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 crane fly larva

Crane Fly Larvae

There are over 500 species of crane flies in North America.

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

Fishfly Larvae

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

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 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