Lowland rivers (southeast Missouri)

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Photo of a spotted fishing spider perched on the water's surface amid floating duckweed plants

Aquatic Spiders

Dolomedes spp., Tetragnatha spp., and others

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

Bryozoans (Moss Animals)

Freshwater species in the phylum Bryozoa

Photo of crane fly larva

Crane Fly Larvae

There are over 500 species of crane flies in North America.

Photo of a spothanded crayfish viewed from above on white background.

Crayfishes

About 36 species in Missouri

Monkey Face Mussel

Freshwater Mussels

Bivalve molluscs in order Unionoida

No photo available

Hydras

Various species in the genus Hydra

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.