Closeup of alligator gar held in a person's hands prior to being released into water

    Alligator Gar

    Atractosteus spatula (formerly Lepisosteus spatula)
    Photo of a spotted fishing spider perched on the water's surface amid floating duckweed plants

    Aquatic Spiders

    Dolomedes spp., Tetragnatha spp., and others
    Image of a bigmouth buffalo

    Bigmouth Buffalo

    Ictiobus cyprinellus
    A long fish with prominent dorsal and pectoral fins

    Black Carp

    Mylopharyngodon piceus
    invasive icon

    Invasive

    Illustration of a male black crappie in spawning coloration.

    Black Crappie

    Pomoxis nigromaculatus
    Bluefer

    Bluefer (Purpleshell)

    Potamilus purpuratus
    Gray, speckled, translucent gelatinous blob cut in half to show structure

    Bryozoans (Moss Animals)

    Freshwater species in the phylum Bryozoa
    Photo of caddisfly larva with case made of detritus

    Caddisfly Larvae

    Various species in the order Trichoptera
    Color illustration of Central Mudminnow

    Central Mudminnow

    Umbra limi
    exclamation mark

    Endangered

    channel catfish

    Channel Catfish

    Ictalurus punctatus
    Photograph of Ebonyshell freshwater mussel shell exterior view

    Ebonyshell

    Fusconaia ebena
    exclamation mark

    Endangered

    Monkey Face Mussel

    Freshwater Mussels

    Bivalve molluscs in order Unionoida
    giant floater

    Giant Floater

    Pygandon grandis
    Photo of a giant water bug

    Giant Water Bugs

    Species in the genera Abedus, Belostoma, and Lethocerus
    Venomous Icon

    Venomous

    Photo of several prosobranch pond snails crawling on a rock.

    Gilled Aquatic Snails (Prosobranch Pond Snails)

    Over 20 Missouri species in former subclass Prosobranchia
    Photo of hellgrammite

    Hellgrammite

    Corydalus cornutus
    Photo of a horsehair worm in an aquarium

    Horsehair Worms

    About 350 species scientifically described.
    No photo available

    Hydras

    Various species in the genus Hydra
    lilliput

    Lilliput

    Toxolasma parvus
    Image of a longnose gar fish

    Longnose Gar

    Lepisosteus osseus
    Photo of pulmonate snail crawling on rock

    Lunged Aquatic Snails (Pulmonate Pond Snails)

    Over 30 Missouri species in former subclass Pulmonata
    Photograph of several mosquito larvae resting at water surface

    Mosquito Larvae

    There are about 50 species of mosquitoes in our state.
    illustration of big, long-nosed fish

    Paddlefish

    Polyodon spathula
    pistolgrip

    Pistolgrip (Buckhorn)

    Tritogonia verrucosa
    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, image of head and front portion of body, swimming in an aquarium

    Shortnose Gar

    Lepisosteus platostomus
    Illustration of northern snakehead, viewed from side

    Snakeheads

    Channa spp. and Parachanna spp., including C. argus
    invasive icon

    Invasive

    Spotted gar, closeup of head, held in a fisher’s gloved hands, at Mingo NWR

    Spotted Gar

    Lepisosteus oculatus
    Photo of stonefly naiad on a rock underwater

    Stonefly Larvae

    There are hundreds of species in North America
    illustration of a striped bass, side view

    Striped Bass

    Morone saxatilis
    threeridge

    Threeridge

    Amblema plicata
    Photo of an aquatic tubificid worm among rocks in an aquarium.

    Tubificid Worms (Tubifex Worms)

    Tubifex spp. and other aquatic tubificid annelids
    Photo of a pink planarian on a rock.

    Turbellarians (Planarians; Free-Living Flatworms)

    Species in genera Dugesia, Planaria, etc.
    Photo of a collared water scavenger beetle showing back.

    Water Scavenger Beetles

    Beetles in the family Hydrophilidae
    Photo of a water scorpion, genus Ranatra, captured in a jar of pond water.

    Water Scorpions

    Ranatra spp. and Nepa apiculata
    Water springtails congregate in water above soggy dead leaves

    Water Springtail

    Podura aquatica
    Photo of a single water strider

    Water Striders

    Aquarius remigis; also species in the genus Gerris
    Photo of a whirligig beetle viewed from above

    Whirligig Beetles

    Species in the beetle family Gyrinidae
    Image of white crappie

    White Crappie

    Pomoxis annularis
    white heelsplitter

    White Heelsplitter

    Lasmigona complanata
    Zebra Mussel

    Zebra Mussel

    Dreissena polymorpha
    invasive icon

    Invasive