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

image of Caddisfly on leaf

Caddisflies

About 1,500 species in North America north of Mexico

Click beetle resting on a brick wall

Click Beetles

Approximately 1,000 species in North America

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

Red milkweed beetle eating a common milkweed leaf.

Longhorned Beetles (Borers; Sawyer Beetles)

About 1,000 species in North America north of Mexico

Narceus Millipede crawling across gravel

Millipedes

More than 900 species in North America north of Mexico

Male eastern Hercules beetle walking in grass

Scarab Beetles

About 1,700 species in North America north of Mexico

Photo of a pink planarian on a rock.

Turbellarians (Planarians; Free-Living Flatworms)

Species in genera Dugesia, Planaria, etc.

image of Xystodesmid Millipede crawling on a forest floor

Xystodesmid Millipedes

8 tribes, with about 23 genera, in North America north of Mexico