Photo of a spothanded crayfish viewed from above on white background.

    Crayfishes

    About 36 species in Missouri
    Photo of a sowbug (left) and pillbug (right).

    Pillbugs and Sowbugs (Land Isopods)

    Land-dwelling members of the crustacean order Isopoda
    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