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
    Photo of a Cajun dwarf crayfish.

    Cajun Dwarf Crayfish

    Cambarellus puer
    Photo of a Caney Mountain cave crayfish out of water on a wet, red-coated cave rock.

    Caney Mountain Cave Crayfish

    Faxonius stygocaneyi (formerly Orconectes stygocaneyi)
    Photo of a spothanded crayfish viewed from above on white background.

    Crayfishes

    About 36 species in Missouri
    Photo of a St. Francis River crayfish.

    St. Francis River Crayfish

    Faxonius quadruncus (formerly Orconectes quadruncus)