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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 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 amphipod on a rock

Scuds and Sideswimmers (Amphipods)

Species in the crustacean order Amphipoda

Photo of a pink planarian on a rock.

Turbellarians (Planarians; Free-Living Flatworms)

Species in genera Dugesia, Planaria, etc.

Water springtails congregate in water above soggy dead leaves

Water Springtail

Podura aquatica