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

Alderfly Larvae

Sialis spp.

Bluegill male in spawning colors, side view photo with black background

Bluegill

Lepomis macrochirus

Brown trout female side view photo with black background

Brown Trout

Salmo trutta

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 spothanded crayfish viewed from above on white background.

Crayfishes

About 36 species in Missouri

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

Darters

Etheostoma, Percina, Ammocrypta, and Crystallaria spp.

fatmucket

Fatmucket

Lampsilis siliquoidea

Photo of a fishfly larva crawling among rocks in an aquarium.

Fishfly Larvae

Chauliodes, Neohermes, and Nigronia spp. (in eastern US)

Monkey Face Mussel

Freshwater Mussels

Bivalve molluscs in order Unionoida

giant floater

Giant Floater

Pygandon grandis

Photo of several prosobranch pond snails crawling on a rock.

Gilled Aquatic Snails (Prosobranch Pond Snails)

Over 20 Missouri species in former subclass Prosobranchia

Golden shiner male, side view photo with black background

Golden Shiner

Notemigonus crysoleucas

Goldfish side view photo with black background

Goldfish

Carassius auratus

No photo available

Hydras

Various species in the genus Hydra

Photo of a leech

Leeches

Various species in the subclass Hirudinea

Longear sunfish, spawning male, side view photo with black background

Longear Sunfish

Lepomis megalotis

Longnose darter side view photo with black background

Longnose Darter

Percina nasuta

Endangered

Photo of a longpincered crayfish.

Longpincered Crayfish

Faxonius longidigitus (formerly Orconectes longidigitus)

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

plain pocketbook

Plain Pocketbook

Lampsilis cardium

Photo of a ramshorn snail on a wet rock.

Ramshorn Snails

Gyraulus, Helisoma, Menetus, Micromenetus, Planorbula spp.

Redear sunfish side view photo with black background

Redear Sunfish

Lepomis microlophus

Photo of amphipod on a rock

Scuds and Sideswimmers (Amphipods)

Species in the crustacean order Amphipoda

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 northern, also called virile, crayfish.

Virile Crayfish (Northern Crayfish)

Faxonius virilis (formerly Oronectes virilis)

Warmouth male in spawning colors, side view photo with black background

Warmouth

Lepomis gulosus

Photo of a collared water scavenger beetle showing back.

Water Scavenger Beetles

Beetles in the family Hydrophilidae

Water springtails congregate in water above soggy dead leaves

Water Springtail

Podura aquatica

White sucker side view photo with black background

White Sucker

Catostomus commersonii