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
    Black crappie, male in spawning colors, side view photo with black background

    Black Crappie

    Pomoxis nigromaculatus
    Bowfin side view photo with black background

    Bowfin

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

    Bryozoans (Moss Animals)

    Freshwater species in the phylum Bryozoa
    Channel catfish side view photo with black background

    Channel Catfish

    Ictalurus punctatus
    Chestnut lamprey side view photo with black background

    Chestnut Lamprey

    Ichthyomyzon castaneus
    Common carp side view photo with black background

    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
    Flathead catfish side view photo with black background

    Flathead Catfish

    Pylodictis olivaris
    Monkey Face Mussel

    Freshwater Mussels

    Bivalve molluscs in order Unionoida
    Grass carp side view photo with black background

    Grass Carp

    Ctenopharyngodon idella
    invasive icon

    Invasive

    Grass pickerel side view photo with black background

    Grass Pickerel

    Esox americanus
    No photo available

    Hydras

    Various species in the genus Hydra
    Lake sturgeon side view photo with black background

    Lake Sturgeon

    Acipenser fulvescens
    exclamation mark

    Endangered

    lilliput

    Lilliput

    Toxolasma parvus
    Longnose gar side view photo with black background

    Longnose Gar

    Lepisosteus osseus
    Photo of a midge fly larva crawling on a rock in an aquarium

    Midge Fly Larvae

    Nearly 1,100 species in North America
    pink papershell

    Pink Papershell

    Potamilus ohiensis
    Photo of a predaceous diving beetle

    Predaceous Diving Beetles (Water Tigers)

    Species in the beetle family Dytiscidae
    Photo of a ramshorn snail on a wet rock.

    Ramshorn Snails

    Gyraulus, Helisoma, Menetus, Micromenetus, Planorbula spp.
    Shortnose gar side view photo with black background

    Shortnose Gar

    Lepisosteus platostomus
    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.
    Walleye side view photo with black background

    Walleye

    Sander vitreus
    White crappie male, side view photo with black background

    White Crappie

    Pomoxis annularis