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Photo of backswimmer, side view

Backswimmers

About 32 North American species in the family Notonectidae

Photo of a Cajun dwarf crayfish.

Cajun Dwarf Crayfish

Cambarellus puer

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.

Photo of a devil crayfish.

Devil Crayfish

Lacunicambarus aff. diogenes

Monkey Face Mussel

Freshwater Mussels

Bivalve molluscs in order Unionoida

Goldfish side view photo with black background

Goldfish

Carassius auratus

Photo of a leech

Leeches

Various species in the subclass Hirudinea

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

Photo of a painted devil crayfish standing on a sandy substrate

Painted Devil Crayfish

Lacunicambarus ludovicianus

Photo of a ramshorn snail on a wet rock.

Ramshorn Snails

Gyraulus, Helisoma, Menetus, Micromenetus, Planorbula spp.

Photo of a red swamp crawfish or crayfish.

Red Swamp Crawfish

Procambarus clarkii

Photo of a shrimp crayfish.

Shrimp Crayfish

Faxonius lancifer (formerly Orconectes lancifer)

Photo of a Shufeldt’s dwarf crayfish.

Shufeldt’s Dwarf Crayfish (Swamp Dwarf Crayfish)

Cambarellus shufeldtii

Taillight shiner male in spawning colors, side view photo with black background

Taillight Shiner

Notropis maculatus

Endangered

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 vernal crayfish.

Vernal Crayfish

Procambarus viaeviridus

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

Warmouth

Lepomis gulosus

Water springtails congregate in water above soggy dead leaves

Water Springtail

Podura aquatica

Photo of a White River crawfish.

White River Crawfish

Procambarus acutus