Photo of backswimmer, side view

    Backswimmers

    About 32 North American species in the family Notonectidae
    Photo of a spothanded crayfish viewed from above on white background.

    Crayfishes

    About 36 species in Missouri
    Orangethroat darter male in spawning colors, side view photo with black background

    Darters

    Etheostoma, Percina, Ammocrypta, and Crystallaria spp.
    Photo of a devil crayfish.

    Devil Crayfish

    Lacunicambarus aff. diogenes
    Monkey Face Mussel

    Freshwater Mussels

    Bivalve molluscs in order Unionoida
    Goldfish side view photo with black background

    Goldfish

    Carassius auratus
    Photo of a leech

    Leeches

    Various species in the subclass Hirudinea
    Photo of a midge fly larva crawling on a rock in an aquarium

    Midge Fly Larvae

    Nearly 1,100 species in North America
    Southern redbelly dace male in spawning colors, side view photo with black background

    Minnows

    Notropis, Cyprinella, Hybognathus, Luxilus, and others
    Photo of a ramshorn snail on a wet rock.

    Ramshorn Snails

    Gyraulus, Helisoma, Menetus, Micromenetus, Planorbula spp.