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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 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 a pink planarian on a rock.

Turbellarians (Planarians; Free-Living Flatworms)

Species in genera Dugesia, Planaria, etc.

Water springtails congregate in water above soggy dead leaves

Water Springtail

Podura aquatica