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Photo of backswimmer, side view

Backswimmers

About 32 North American species in the family Notonectidae

Gray, speckled, translucent gelatinous blob cut in half to show structure

Bryozoans (Moss Animals)

Freshwater species in the phylum Bryozoa

Common shiner side view photo with black background

Common Shiner

Luxilus cornutus

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

Darters

Etheostoma, Percina, Ammocrypta, and Crystallaria spp.

deertoe

Deertoe

Truncilla truncata

elktoe

Elktoe

Alasmidonta marginata

ellipse

Ellipse and Bleedingtooth

Venustaconcha ellipsiformis and V. pleasii

fragile papershell

Fragile Papershell

Leptodea fragilis

Monkey Face Mussel

Freshwater Mussels

Bivalve molluscs in order Unionoida

No photo available

Hydras

Various species in the genus Hydra

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

Minnows

Notropis, Cyprinella, Hybognathus, Luxilus, and others

mucket

Mucket

Actinonaias ligamentina

plain pocketbook

Plain Pocketbook

Lampsilis cardium

Photo of a ramshorn snail on a wet rock.

Ramshorn Snails

Gyraulus, Helisoma, Menetus, Micromenetus, Planorbula spp.

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.

wabash pigtoe

Wabash Pigtoe

Fusconaia flava