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 a belted crayfish, also called Big River crayfish.

    Belted Crayfish (Big River Crayfish)

    Faxonius harrisonii (formerly Orconectes harrisonii)
    Bigmouth buffalo side view photo with black background

    Bigmouth Buffalo

    Ictiobus cyprinellus
    Black buffalo side view photo with black background

    Black Buffalo

    Ictiobus niger
    Black bullhead side view photo with black background

    Black Bullhead

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

    Black Crappie

    Pomoxis nigromaculatus
    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
    Bleeding shiner male in spawning colors, side view photo with black background

    Bleeding Shiner

    Luxilus zonatus
    Brindled madtom side view photo with black background

    Brindled Madtom

    Noturus miurus
    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
    Checkered madtom side view photo with black background

    Checkered Madtom

    Noturus flavater
    Orangethroat darter male in spawning colors, side view photo with black background

    Darters

    Etheostoma, Percina, Ammocrypta, and Crystallaria spp.
    Photograph of Ebonyshell freshwater mussel shell exterior view

    Ebonyshell

    Fusconaia ebena
    exclamation mark

    Endangered

    elephant's ear

    Elephantear

    Elliptio crassidens
    exclamation mark

    Endangered

    Photo of a freckled crayfish.

    Freckled Crayfish

    Cambarus maculatus
    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 a golden crayfish viewed through the surface of creek water.

    Golden Crayfish

    Faxonius luteus (formerly Orconectes luteus)
    Goldfish side view photo with black background

    Goldfish

    Carassius auratus
    Goldstripe darter side view photo with black background

    Goldstripe Darter

    Etheostoma parvipinne
    exclamation mark

    Endangered

    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
    Johnny darter, female, side view photo with black background

    Johnny Darter

    Etheostoma nigrum
    Knobfin sculpin side view photo with black background

    Knobfin Sculpin

    Cottus immaculatus
    lilliput

    Lilliput

    Toxolasma parvus
    Longnose darter side view photo with black background

    Longnose Darter

    Percina nasuta
    exclamation mark

    Endangered

    Longnose gar side view photo with black background

    Longnose Gar

    Lepisosteus osseus
    Photo of a longpincered crayfish.

    Longpincered Crayfish

    Faxonius longidigitus (formerly Orconectes longidigitus)
    Photo of pulmonate snail crawling on rock

    Lunged Aquatic Snails (Pulmonate Pond Snails)

    Over 30 Missouri species in former subclass Pulmonata
    Southern redbelly dace male in spawning colors, side view photo with black background

    Minnows

    Notropis, Cyprinella, Hybognathus, Luxilus, and others
    Photograph of several mosquito larvae resting at water surface

    Mosquito Larvae

    There are about 50 species of mosquitoes in our state.
    Mottled sculpin side view photo with black background

    Mottled Sculpin

    Cottus bairdii
    Northern brook lamprey side view photo with black background

    Northern Brook Lamprey

    Ichthyomyzon fossor
    Northern rock bass, or goggle-eye, side view photo with black background

    Northern Rock Bass

    Ambloplites rupestris
    Ozark sculpin side view photo with black background

    Ozark Sculpin

    Cottus hypselurus
    pistolgrip

    Pistolgrip (Buckhorn)

    Tritogonia verrucosa
    pond mussel

    Pond Mussel

    Ligumia subrostrata
    Photo of a predaceous diving beetle

    Predaceous Diving Beetles (Water Tigers)

    Species in the beetle family Dytiscidae
    Rainbow darter female side view photo with black background

    Rainbow Darter

    Etheostoma caeruleum
    Photo of a ramshorn snail on a wet rock.

    Ramshorn Snails

    Gyraulus, Helisoma, Menetus, Micromenetus, Planorbula spp.
    Photo of a ringed crayfish.

    Ringed Crayfish

    Faxonius neglectus (formerly Orconectes neglectus)
    Photo of a saddleback crayfish.

    Saddleback Crayfish

    Faxonius medius (formerly Orconectes medius)
    Slender madtom side view photo with black background

    Slender Madtom

    Noturus exilis
    Southern redbelly dace side view photo with black background

    Southern Redbelly Dace

    Chrosomus erythrogaster (formerly Phoxinus erythrogaster)
    Spectaclecase

    Spectaclecase

    Cumberlandia monodonta

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