brokenray

    Arkansas Brokenray

    Lampsilis reeveiana
    Photo of backswimmer, side view

    Backswimmers

    About 32 North American species in the family Notonectidae
    Photo of a belted crayfish, also called Big River crayfish.

    Belted Crayfish (Big River Crayfish)

    Faxonius harrisonii (formerly Orconectes harrisonii)
    Bluefer

    Bluefer (Purpleshell)

    Potamilus purpuratus
    Gray, speckled, translucent gelatinous blob cut in half to show structure

    Bryozoans (Moss Animals)

    Freshwater species in the phylum Bryozoa
    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

    Photo of a coldwater crayfish.

    Coldwater Crayfish

    Faxonius eupunctus (formerly Orconectes eupunctus)
    Photo of crane fly larva

    Crane Fly Larvae

    There are over 500 species of crane flies in North America.
    deertoe

    Deertoe

    Truncilla truncata
    elephant's ear

    Elephantear

    Elliptio crassidens
    exclamation mark

    Endangered

    elktoe

    Elktoe

    Alasmidonta marginata
    ellipse

    Ellipse and Bleedingtooth

    Venustaconcha ellipsiformis and V. pleasii
    fatmucket

    Fatmucket

    Lampsilis siliquoidea
    fragile papershell

    Fragile Papershell

    Leptodea fragilis
    Photo of a freshwater jellyfish

    Freshwater Jellyfish

    Craspedacusta sowerbii (syn. C. sowerbyi)
    Monkey Face Mussel

    Freshwater Mussels

    Bivalve molluscs in order Unionoida
    giant floater

    Giant Floater

    Pygandon grandis
    Photo of a golden crayfish viewed through the surface of creek water.

    Golden Crayfish

    Faxonius luteus (formerly Orconectes luteus)
    No photo available

    Hydras

    Various species in the genus Hydra
    lilliput

    Lilliput

    Toxolasma parvus
    maple leaf

    Mapleleaf

    Quadrula quadrula
    Photo of a midge fly larva crawling on a rock in an aquarium

    Midge Fly Larvae

    Nearly 1,100 species in North America
    monkeyface

    Monkeyface

    Quadrula metanevra
    mucket

    Mucket

    Actinonaias ligamentina
    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
    paper pondshell

    Paper Pondshell (Paper Floater)

    Utterbackia imbecillis
    pimpleback

    Pimpleback

    Quadrula pustulosa
    pink heelsplitter

    Pink Heelsplitter

    Potamilus alatus
    pink mucket

    Pink Mucket

    Lampsilis abrupta
    exclamation mark

    Endangered

    pink papershell

    Pink Papershell

    Potamilus ohiensis
    pistolgrip

    Pistolgrip (Buckhorn)

    Tritogonia verrucosa
    plain pocketbook

    Plain Pocketbook

    Lampsilis cardium
    pond mussel

    Pond Mussel

    Ligumia subrostrata
    Photograph of Purple Wartyback freshwater mussel shell exterior view
    Photo of a ringed crayfish.

    Ringed Crayfish

    Faxonius neglectus (formerly Orconectes neglectus)
    round pigtoe

    Round Pigtoe

    Pleurobema sintoxia
    scaleshell

    Scaleshell

    Leptodea leptodon
    exclamation mark

    Endangered

    Snuffbox

    Snuffbox

    Epioblasma triquetra
    exclamation mark

    Endangered

    spike

    Spike (Ladyfinger)

    Elliptio dilatata
    Photo of a spothanded crayfish viewed through creekwater.

    Spothanded Crayfish

    Faxonius punctimanus (formerly Orconectes punctimanus)
    threehorn wartyback

    Threehorn Wartyback

    Obliquaria reflexa
    threeridge

    Threeridge

    Amblema plicata
    Photo of a pink planarian on a rock.

    Turbellarians (Planarians; Free-Living Flatworms)

    Species in genera Dugesia, Planaria, etc.
    Photo of a northern, also called virile, crayfish.

    Virile Crayfish (Northern Crayfish)

    Faxonius virilis (formerly Oronectes virilis)
    wabash pigtoe

    Wabash Pigtoe

    Fusconaia flava
    Photo of a water nymph crayfish, side view of specimen carefully arranged against black background

    Water Nymph Crayfish

    Faxonius nais (formerly Orconectes nais)
    Photo of a collared water scavenger beetle showing back.

    Water Scavenger Beetles

    Beetles in the family Hydrophilidae
    white heelsplitter

    White Heelsplitter

    Lasmigona complanata
    yellow sandshell

    Yellow Sandshell

    Lampsilis teres