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Photo of an aquatic isopod in an aquarium, crawling on a rock.

Aquatic Pillbugs and Sowbugs (Aquatic Isopods)

Freshwater members of the crustacean order Isopoda

Photo of a spothanded crayfish viewed from above on white background.

Crayfishes

About 36 species in Missouri

Photo of several prosobranch pond snails crawling on a rock.

Gilled Aquatic Snails (Prosobranch Pond Snails)

Over 20 Missouri species in former subclass Prosobranchia

Photo of pulmonate snail crawling on rock

Lunged Aquatic Snails (Pulmonate Pond Snails)

Over 30 Missouri species in former subclass Pulmonata

Photograph of several mosquito larvae resting at water surface

Mosquito Larvae

There are about 50 species of mosquitoes in our state.

Photo of stonefly naiad on a rock underwater

Stonefly Larvae

There are hundreds of species in North America

Photo of a pink planarian on a rock.

Turbellarians (Planarians; Free-Living Flatworms)

Species in genera Dugesia, Planaria, etc.