image of Bee Fly on leaf

    Bee Flies

    About 800 species in North America
    Closeup of brown recluse spider on floor.

    Brown Recluse (Violin Spider)

    Loxosceles reclusa
    Venomous Icon

    Venomous

    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
    image of a Carolina Grasshopper

    Carolina Grasshopper

    Dissosteira carolina
    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
    image of Fiery Searcher on dead leaves

    Ground Beetles

    About 2,400 species in North America north of Mexico
    Image of house centipede

    House Centipede

    Scutigera coleoptrata
    No photo available

    Hydras

    Various species in the genus Hydra
    Large crane fly perched on a white-painted surface, side view

    Large Crane Flies

    More than 500 species in North America north of Mexico
    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 an adult stonefly on a leaf

    Stoneflies

    Nearly 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.