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 backswimmer, side view

    Backswimmers

    About 32 North American species in the family Notonectidae
    Illustration of a male bluegill

    Bluegill

    Lepomis macrochirus
    Image of a bowfin

    Bowfin

    Amia calva
    Image of a brook silverside

    Brook Silverside

    Labidesthes sicculus
    Gray, speckled, translucent gelatinous blob cut in half to show structure

    Bryozoans (Moss Animals)

    Freshwater species in the phylum Bryozoa
    Photo of a papershell crayfish, also called calico crayfish.

    Calico Crayfish (Papershell Crayfish)

    Faxonius immunis (formerly Orconectes immunis)
    Color illustration of Central Mudminnow

    Central Mudminnow

    Umbra limi
    exclamation mark

    Endangered

    channel catfish

    Channel Catfish

    Ictalurus punctatus
    Photo of two Chinese mystery snails, on a white background, with a ruler nearby for scale.

    Chinese Mystery Snail

    Cipangopaludina chinensis malleata (syn. Bellamya chinensis)
    invasive icon

    Invasive

    Illustration of common carp

    Common Carp

    Cyprinus carpio
    invasive icon

    Invasive

    Photo of crane fly larva

    Crane Fly Larvae

    There are over 500 species of crane flies in North America.
    Photo of a spothanded crayfish viewed from above on white background.

    Crayfishes

    About 36 species in Missouri
    Color illustration of Cypress Minnow

    Cypress Minnow

    Hybognathus hayi
    exclamation mark

    Endangered

    Photo of a devil crayfish.

    Devil Crayfish

    Lacunicambarus aff. diogenes
    Image of a fathead minnow

    Fathead Minnow

    Pimephales promelas
    Image of a flier sunfish

    Flier

    Centrarchus macropterus
    Monkey Face Mussel

    Freshwater Mussels

    Bivalve molluscs in order Unionoida
    Image of a golden shiner

    Golden Shiner

    Notemigonus crysoleucas
    Color illustration of grass pickerel, a long, narrow fish

    Grass Pickerel

    Esox americanus
    Color illustration of Harlequin Darter-Male

    Harlequin Darter

    Etheostoma histrio
    exclamation mark

    Endangered

    No photo available

    Hydras

    Various species in the genus Hydra
    Photo of a leech

    Leeches

    Various species in the subclass Hirudinea
    lilliput

    Lilliput

    Toxolasma parvus
    Photo of a midge fly larva crawling on a rock in an aquarium

    Midge Fly Larvae

    Nearly 1,100 species in North America
    Photo of a painted devil crayfish standing on a sandy substrate

    Painted Devil Crayfish

    Lacunicambarus ludovicianus
    Photo of a paintedhand mudbug carefully arranged against a black background

    Paintedhand Mudbug

    Lacunicambarus polychromatus
    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.
    Photo of stonefly naiad on a rock underwater

    Stonefly Larvae

    There are hundreds of species in North America
    Color illustration of Swamp Darter

    Swamp Darter

    Etheostoma fusiforme
    exclamation mark

    Endangered

    Color illustration of Taillight Shiner

    Taillight Shiner

    Notropis maculatus
    exclamation mark

    Endangered

    Photo of a pink planarian on a rock.

    Turbellarians (Planarians; Free-Living Flatworms)

    Species in genera Dugesia, Planaria, etc.
    Warmouth

    Warmouth

    Lepomis gulosus
    Image of white crappie

    White Crappie

    Pomoxis annularis