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1 1/2 to 2 inches

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    Admirable Grasshopper on grass stem

    Admirable Grasshopper

    Syrbula admirabilis
    image of Walker's Cicada clinging to a perch

    Annual Cicadas

    Neotibicen spp. (in Missouri) (formerly Tibicen)
    brokenray

    Arkansas Brokenray

    Lampsilis reeveiana
    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
    Chinese mantis

    Chinese Mantis

    Tenodera sinensis (formerly T. aridifolia)
    Two Chinese mysterysnails, out of water, resting on a white surface, with a ruler nearby for scale

    Chinese Mysterysnail

    Cipangopaludina chinensis malleata (syn. Bellamya chinensis)
    invasive icon

    Invasive

    Photo of a coldwater crayfish.

    Coldwater Crayfish

    Faxonius eupunctus (formerly Orconectes eupunctus)
    exclamation mark

    Endangered

    image of a Common True Katydid

    Common True Katydid

    Pterophylla camellifolia
    Photo of an adult damselfly on a twig next to water.

    Damselflies

    Species in the suborder Zygoptera
    deertoe

    Deertoe

    Truncilla truncata
    Image of a differential grasshopper.

    Differential Grasshopper

    Melanoplus differentialis
    Photo of a male Banded Pennant dragonfly

    Dragonflies

    Species in the suborder Anisoptera
    Photo of an Eastern Pondhawk dragonfly, female

    Eastern Pondhawk

    Erythemis simplicicollis
    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
    Monkey Face Mussel

    Freshwater Mussels

    Bivalve molluscs in order Unionoida
    giant floater

    Giant Floater

    Pygandon grandis
    Photo of a giant walkingstick

    Giant Walkingstick

    Megaphasma denticrus
    Photo of a golden crayfish viewed through the surface of creek water.

    Golden Crayfish

    Faxonius luteus (formerly Orconectes luteus)
    image of Fiery Searcher on dead leaves

    Ground Beetles

    About 2,400 species in North America north of Mexico
    Photo of a Hine's emerald dragonfly

    Hine's Emerald

    Somatochlora hineana
    exclamation mark

    Endangered

    No photo available

    Hydras

    Various species in the genus Hydra
    Common true katydid female on a leaf

    Katydids

    About 250 species in North America north of Mexico
    Lesser angle-winged katydid resting on the ground

    Lesser Angle-Winged Katydid

    Microcentrum retinerve
    lilliput

    Lilliput

    Toxolasma parvus
    Red milkweed beetle eating a common milkweed leaf.

    Longhorned Beetles (Borers; Sawyer Beetles)

    About 1,000 species in North America north of Mexico
    Female Carolina mantis

    Mantids (Mantises)

    Stagomantis carolina, Mantis religiosa, and Tenodera sinensis
    maple leaf

    Mapleleaf

    Quadrula quadrula
    monkeyface

    Monkeyface

    Quadrula metanevra
    mucket

    Mucket

    Actinonaias ligamentina
    Photo of walkingsticks during outbreak

    Northern Walkingstick

    Diapheromera femorata
    Pink katydid standing on a milkweed leaf

    Oblong-Winged Katydid

    Amblycorypha oblongifolia
    Olive-green swamp grasshopper perched on a grass blade

    Olive-Green Swamp Grasshopper

    Paroxya clavuliger (syn. P. hoosieri)
    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
    Newly emerged adult pronghorn clubtail dragonfly perched on a grass stem

    Pronghorn Clubtail

    Phanogomphus graslinellus
    Photograph of Purple Wartyback freshwater mussel shell exterior view

    Purple Wartyback (Purple Pimpleback)

    Cyclonaias tuberculata

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