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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

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

No photo available

Hydras

Various species in the genus Hydra

Photo of pulmonate snail crawling on rock

Lunged Aquatic Snails (Pulmonate Pond Snails)

Over 30 Missouri species in former subclass Pulmonata

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.