Prairie rivers and streams

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

Alderfly Larvae

Sialis spp.

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 spotted fishing spider perched on the water's surface amid floating duckweed plants

Aquatic Spiders

Dolomedes spp., Tetragnatha spp., and others

Black buffalo side view photo with black background

Black Buffalo

Ictiobus niger

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 a papershell crayfish, also called calico crayfish.

Calico Crayfish (Papershell Crayfish)

Faxonius immunis (formerly Orconectes immunis)

Channel catfish side view photo with black background

Channel Catfish

Ictalurus punctatus

Photo of crane fly larva

Crane Fly Larvae

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

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

Crayfishes

About 36 species in Missouri

Photo of a damselfly nymph on rocks in an aquarium.

Damselfly Larvae

Species in the suborder Zygoptera

Orangethroat darter male in spawning colors, side view photo with black background

Darters

Etheostoma, Percina, Ammocrypta, and Crystallaria spp.

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 freshwater jellyfish

Freshwater Jellyfish

Craspedacusta sowerbii (syn. C. sowerbyi)

Monkey Face Mussel

Freshwater Mussels

Bivalve molluscs in order Unionoida

Photo of several prosobranch pond snails crawling on a rock.

Gilled Aquatic Snails (Prosobranch Pond Snails)

Over 20 Missouri species in former subclass Prosobranchia

Goldfish side view photo with black background

Goldfish

Carassius auratus

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 pulmonate snail crawling on rock

Lunged Aquatic Snails (Pulmonate Pond Snails)

Over 30 Missouri species in former subclass Pulmonata

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

Midge Fly Larvae

Nearly 1,100 species in North America

Southern redbelly dace male in spawning colors, side view photo with black background

Minnows

Notropis, Cyprinella, Hybognathus, Luxilus, and others

Photograph of several mosquito larvae resting at water surface

Mosquito Larvae

There are about 50 species of mosquitoes in our state.

Northern pike side view photo with black background

Northern Pike

Esox lucius

Photo of a ramshorn snail on a wet rock.

Ramshorn Snails

Gyraulus, Helisoma, Menetus, Micromenetus, Planorbula spp.

River carpsucker side view photo with black background

River Carpsucker

Carpiodes carpio

Smallmouth buffalo side view photo with black background

Smallmouth Buffalo

Ictiobus bulbalus

Northern snakehead side view illustration with black background

Snakeheads

Channa argus and other Channa and Parachanna spp.

Invasive

Photo of stonefly naiad on a rock underwater

Stonefly Larvae

There are hundreds of species in North America

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.

Photo of a water boatman

Water Boatmen

About 125 species in North America in the family Corixidae

Water springtails congregate in water above soggy dead leaves

Water Springtail

Podura aquatica

Western mosquitofish female, side view photo with black background

Western Mosquitofish

Gambusia affinis

Photo of a whirligig beetle viewed from above

Whirligig Beetles

Species in the beetle family Gyrinidae

Photo of a White River crawfish.

White River Crawfish

Procambarus acutus