Photo of an aquatic isopod in an aquarium, crawling on a rock.

    Aquatic Pillbugs and Sowbugs (Aquatic Isopods)

    Freshwater members of the crustacean order Isopoda
    Black bullhead side view photo with black background

    Black Bullhead

    Ameiurus melas
    Blackspotted topminnow side view photo with black background

    Blackspotted Topminnow

    Fundulus olivaceus
    Blackstripe topminnow, male in spawning colors, side view photo with black background

    Blackstripe Topminnow

    Fundulus notatus
    Brindled madtom side view photo with black background

    Brindled Madtom

    Noturus miurus
    Brown bullhead side view photo with black background

    Brown Bullhead

    Ameiurus nebulosus
     Central mudminnow side view photo with black background

    Central Mudminnow

    Umbra limi
    exclamation mark

    Endangered

    Freckled madtom side view photo with black background

    Freckled Madtom

    Noturus nocturnus
    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
    Harlequin darter side view photo with black background

    Harlequin Darter

    Etheostoma histrio
    exclamation mark

    Endangered

    Photo of a deer fly larva, probably in a petri dish, on a gray background.

    Horse and Deer Fly Larvae

    Tabanus, Chrysops, and related genera
    No photo available

    Hydras

    Various species in the genus Hydra
    lilliput

    Lilliput

    Toxolasma parvus
    Photograph of several mosquito larvae resting at water surface

    Mosquito Larvae

    There are about 50 species of mosquitoes in our state.
    pond mussel

    Pond Mussel

    Ligumia subrostrata
    River carpsucker side view photo with black background

    River Carpsucker

    Carpiodes carpio
    Photo of amphipod on a rock

    Scuds and Sideswimmers (Amphipods)

    Species in the crustacean order Amphipoda
    Shortnose gar side view photo with black background

    Shortnose Gar

    Lepisosteus platostomus
    Spotted gar side view photo with black background

    Spotted Gar

    Lepisosteus oculatus
    Swamp darter side view photo with black background

    Swamp Darter

    Etheostoma fusiforme
    exclamation mark

    Endangered

    Tadpole madtom female, side view photo with black background

    Tadpole Madtom

    Noturus gyrinus
    Photo of a pink planarian on a rock.

    Turbellarians (Planarians; Free-Living Flatworms)

    Species in genera Dugesia, Planaria, etc.
    Photo of a single water strider

    Water Striders

    Aquarius remigis; also species in the genus Gerris
    White crappie male, side view photo with black background

    White Crappie

    Pomoxis annularis
    Yellow bullhead side view photo with black background

    Yellow Bullhead

    Ameiurus natalis