1 1/2 to 2 inches

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

Bryozoans (Moss Animals)

Freshwater species in the phylum Bryozoa

Monkey Face Mussel

Freshwater Mussels

Bivalve molluscs in order Unionoida

giant floater

Giant Floater

Pygandon grandis

Photo of a giant water bug

Giant Water Bugs

Species in the genera Abedus, Belostoma, and Lethocerus

Venomous

Photo of several prosobranch pond snails crawling on a rock.

Gilled Aquatic Snails (Prosobranch Pond Snails)

Over 20 Missouri species in former subclass Prosobranchia

Photo of hellgrammite

Hellgrammite

Corydalus cornutus

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

pistolgrip

Pistolgrip (Buckhorn)

Tritogonia verrucosa

pond mussel

Pond Mussel

Ligumia subrostrata

Photo of a pink planarian on a rock.

Turbellarians (Planarians; Free-Living Flatworms)

Species in genera Dugesia, Planaria, etc.

Photo of a water scorpion, genus Ranatra, captured in a jar of pond water.

Water Scorpions

Ranatra spp. and Nepa apiculata

white heelsplitter

White Heelsplitter

Lasmigona complanata