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
    Blackspotted topminnow side view photo with black background

    Blackspotted Topminnow

    Fundulus olivaceus
    Photo of a freshwater jellyfish

    Freshwater Jellyfish

    Craspedacusta sowerbii (syn. C. sowerbyi)
    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
    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
    Photograph of several mosquito larvae resting at water surface

    Mosquito Larvae

    There are about 50 species of mosquitoes in our state.
    paper pondshell

    Paper Pondshell (Paper Floater)

    Utterbackia imbecillis
    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 bass side view photo with black background

    Spotted Bass

    Micropterus punctulatus
    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 sandshell

    Yellow Sandshell

    Lampsilis teres