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

Aquatic Spiders

Dolomedes spp., Tetragnatha spp., and others

Bigmouth buffalo side view photo with black background

Bigmouth Buffalo

Ictiobus cyprinellus

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

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

Darters

Etheostoma, Percina, Ammocrypta, and Crystallaria spp.

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

Knobfin sculpin side view photo with black background

Knobfin Sculpin

Cottus immaculatus

Photo of pulmonate snail crawling on rock

Lunged Aquatic Snails (Pulmonate Pond Snails)

Over 30 Missouri species in former subclass Pulmonata

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.

Mottled sculpin side view photo with black background

Mottled Sculpin

Cottus bairdii

Northern brook lamprey side view photo with black background

Northern Brook Lamprey

Ichthyomyzon fossor

Ozark sculpin side view photo with black background

Ozark Sculpin

Cottus hypselurus

Photo of a ramshorn snail on a wet rock.

Ramshorn Snails

Gyraulus, Helisoma, Menetus, Micromenetus, Planorbula spp.

Photo of a St. Francis River crayfish.

St. Francis River Crayfish

Faxonius quadruncus (formerly Orconectes quadruncus)

Photo of stonefly naiad on a rock underwater

Stonefly Larvae

There are hundreds of species in North America

Striped bass side view photo with black background

Striped Bass

Morone saxatilis

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

Photo of a whirligig beetle viewed from above

Whirligig Beetles

Species in the beetle family Gyrinidae