Soft-bodied aquatic invertebrates without shells

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Gray, speckled, translucent gelatinous blob cut in half to show structure

Bryozoans (Moss Animals)

Freshwater species in the phylum Bryozoa

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 horsehair worm in an aquarium

Horsehair Worms

About 350 species scientifically described.

No photo available

Hydras

Various species in the genus Hydra

Photo of a leech

Leeches

Various species in the subclass Hirudinea

Photo of a midge fly larva crawling on a rock in an aquarium

Midge Fly Larvae

Nearly 1,100 species in North America

Photograph of several mosquito larvae resting at water surface

Mosquito Larvae

There are about 50 species of mosquitoes in our state.

Photo of an aquatic tubificid worm among rocks in an aquarium.

Tubificid Worms (Tubifex Worms)

Tubifex spp. and other aquatic tubificid annelids

Photo of a pink planarian on a rock.

Turbellarians (Planarians; Free-Living Flatworms)

Species in genera Dugesia, Planaria, etc.