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

    Aquatic Spiders

    Dolomedes spp., Tetragnatha spp., and others
    Photo of backswimmer, side view

    Backswimmers

    About 32 North American species in the family Notonectidae
    Gray, speckled, translucent gelatinous blob cut in half to show structure

    Bryozoans (Moss Animals)

    Freshwater species in the phylum Bryozoa
    channel catfish

    Channel Catfish

    Ictalurus punctatus
    Image of a chestnut lamprey

    Chestnut Lamprey

    Ichthyomyzon castaneus
    Illustration of common carp

    Common Carp

    Cyprinus carpio
    invasive icon

    Invasive

    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
    Illustration of an adult flathead catfish

    Flathead Catfish

    Pylodictis olivaris
    Monkey Face Mussel

    Freshwater Mussels

    Bivalve molluscs in order Unionoida
    Image of grass carp

    Grass Carp

    Ctenopharyngodon idella
    invasive icon

    Invasive

    No photo available

    Hydras

    Various species in the genus Hydra
    Lake sturgeon illustration

    Lake Sturgeon

    Acipenser fulvescens
    exclamation mark

    Endangered

    Photo of a leech

    Leeches

    Various species in the subclass Hirudinea
    lilliput

    Lilliput

    Toxolasma parvus
    Photo of a longpincered crayfish.

    Longpincered Crayfish

    Faxonius longidigitus (formerly Orconectes longidigitus)
    Photo of a midge fly larva crawling on a rock in an aquarium

    Midge Fly Larvae

    Nearly 1,100 species in North America
    Image of a northern rock bass

    Northern Rock Bass (Goggle-Eye)

    Ambloplites rupestris
    pink papershell

    Pink Papershell

    Potamilus ohiensis
    Photo of a ramshorn snail on a wet rock.

    Ramshorn Snails

    Gyraulus, Helisoma, Menetus, Micromenetus, Planorbula spp.
    Photo of stonefly naiad on a rock underwater

    Stonefly Larvae

    There are hundreds of species in North America
    Photo of a pink planarian on a rock.

    Turbellarians (Planarians; Free-Living Flatworms)

    Species in genera Dugesia, Planaria, etc.
    Photo of a northern, also called virile, crayfish.

    Virile Crayfish (Northern Crayfish)

    Faxonius virilis (formerly Oronectes virilis)
    Photo of a water nymph crayfish, side view of specimen carefully arranged against black background

    Water Nymph Crayfish

    Faxonius nais (formerly Orconectes nais)