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

    Black Crappie

    Pomoxis nigromaculatus
    fatmucket

    Fatmucket

    Lampsilis siliquoidea
    Monkey Face Mussel

    Freshwater Mussels

    Bivalve molluscs in order Unionoida
    giant floater

    Giant Floater

    Pygandon grandis
    Photo of several prosobranch pond snails crawling on a rock.

    Gilled Aquatic Snails (Prosobranch Pond Snails)

    Over 20 Missouri species in former subclass Prosobranchia
    Gizzard shad side view photo with black background

    Gizzard Shad

    Dorosoma cepedianum
    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
    Largemouth bass side view photo with black background

    Largemouth Bass

    Micropterous salmoides
    lilliput

    Lilliput

    Toxolasma parvus
    Longnose darter side view photo with black background

    Longnose Darter

    Percina nasuta
    exclamation mark

    Endangered

    Photograph of several mosquito larvae resting at water surface

    Mosquito Larvae

    There are about 50 species of mosquitoes in our state.
    pistolgrip

    Pistolgrip (Buckhorn)

    Tritogonia verrucosa
    plain pocketbook

    Plain Pocketbook

    Lampsilis cardium
    pond mussel

    Pond Mussel

    Ligumia subrostrata
    Photo of amphipod on a rock

    Scuds and Sideswimmers (Amphipods)

    Species in the crustacean order Amphipoda
    Spotted bass side view photo with black background

    Spotted Bass

    Micropterus punctulatus
    Striped bass side view photo with black background

    Striped Bass

    Morone saxatilis
    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 sucker side view photo with black background

    White Sucker

    Catostomus commersoni