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1/4 to 1/2 inch

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    Photo of an alderfly larva among rocks and gravel in an aquarium.

    Alderfly Larvae

    Sialis spp.
    Jagged ambush bug on a plant stem

    Ambush Bugs

    Phymata spp. and others in subfamily Phymatinae (ambush bugs)
    Venomous Icon

    Venomous

    Photo of an American burying beetle

    American Burying Beetle

    Nicrophorus americanus
    exclamation mark

    Endangered

    image of a Thread-Waisted Wasp

    Ammophila Wasps

    Ammophila spp.
    Andrenid or miner bee collecting pollen on a flower

    Andrenid Bees (Miner Bees)

    More than 1,200 species in North America north of Mexico
    Marbled orbweaver spider in web

    Angulate and Roundshouldered Orbweavers

    Araneus spp.
    Acrobat ants on a leaf

    Ants

    More than 700 species in North America
    Longhorn bee visiting a flower, viewed from side

    Apid Bees

    About 1,000 species in North America north of Mexico
    Photo of a female arabesque orbweaver spider

    Arabesque Orbweaver

    Neoscona arabesca
    Photo of an armored harvestman walking on the ground

    Armored Harvestmen

    Members of suborder Laniatores
    Photo of a triangle orbweaver, or arrowhead spider

    Arrowhead Spider (Triangle Orbweaver)

    Verrucosa arenata
    Photo of arrow-shaped micrathena spider

    Arrowshaped Micrathena

    Micrathena sagittata
    Two Asian lady beetles, one orange with several black spots, the other red with no spots

    Asian Lady Beetle

    Harmonia axyridis
    image of Assassin Bug crawling on a leaf

    Assassin Bugs

    Nearly 200 species in North America north of Mexico
    Venomous Icon

    Venomous

    Female spider wasp grasping and dragging body of sac spider

    Auplopus Spider Wasps

    Auplopus spp.
    Banded longhorn beetle on a wild rose

    Banded Longhorn

    Typocerus velutinus
    Photo of a spotted orbweaver or barn spider, Neoscona crucifera, with black background

    Barn Spider

    Neoscona crucifera
    image of Bee Fly on leaf

    Bee Flies

    About 800 species in North America
    image of a Toad Bug

    Big-Eyed Toad Bug

    Gelastocoris oculatus
    Photo of a meloe blister beetle, female, on ground

    Blister Beetles

    More than 400 species in North America north of Mexico
    image of greenbottle fly on carcass

    Blow Flies (Bottle Flies)

    About 84 species in North America.
    Photo of a bold jumping spider.

    Bold Jumper

    Phidippus audax
    Gray, speckled, translucent gelatinous blob cut in half to show structure

    Bryozoans (Moss Animals)

    Freshwater species in the phylum Bryozoa
    image of Caddisfly on leaf

    Caddisflies

    About 1,500 species in North America north of Mexico
    Photo of caddisfly larva with case made of detritus

    Caddisfly Larvae

    Various species in the order Trichoptera
    Camel cricket (cave cricket)

    Camel Crickets (Cave Crickets)

    About 150 species in North America north of Mexico
    image of a Carolina Grasshopper

    Carolina Grasshopper

    Dissosteira carolina
    Click beetle resting on a brick wall

    Click Beetles

    Approximately 1,000 species in North America
    image of Cocklebur Weevil

    Cocklebur Weevil

    Rhodobaenus quinquepunctatus
    Photo of a female scorpionfly perched on a leaf.

    Common Scorpionflies

    Panorpa spp.
    Convergent lady beetle crawling on a leaf

    Convergent Lady Beetle

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

    Crayfishes

    About 36 species in Missouri
    Photo of a Harvestman, viewed from above

    Daddy Longlegs (Harvestmen)

    About 6,500 species have been named so far, worldwide.
    Delta flower scarab clinging to flower

    Delta Flower Scarab

    Trigonopeltastes delta
    Dogbane beetle resting on a window

    Dogbane Beetle

    Chrysochus auratus
    Photo of a female and male European earwig on a dead leaf.

    Earwigs

    Forficula auricularia, Euborellia anulipes, and others.
    Elm borer beetle resting on rocks in a flower planter

    Elm Borer

    Saperda tridentata
    image of a Feather-Legged Fly

    Feather-Legged Flies

    Trichopoda spp.
    image of Firefly crawling on a leaf

    Fireflies (Lightning Bugs)

    Approx. 175 species in North America north of Mexico
    image of a Flower Fly on a flower

    Flower Flies (Syrphids)

    Nearly 900 species in North America
    Monkey Face Mussel

    Freshwater Mussels

    Bivalve molluscs in order Unionoida
    Photo of a furrow orbweaver hanging head down with a green background

    Furrow Orbweavers

    Larinioides spp.
    Image of a giant red-headed centipede.

    Giant Red-Headed Centipede

    Scolopendra heros
    Venomous Icon

    Venomous

    Photo of several prosobranch pond snails crawling on a rock.

    Gilled Aquatic Snails (Prosobranch Pond Snails)

    Over 20 Missouri species in former subclass Prosobranchia
    Photo of a goldenrod crab spider, whitish individual, on native aster flower

    Goldenrod Crab Spider

    Misumena vatia
    Photo of grass spider poised in funnel of her web

    Grass Spiders

    Agelenopsis spp.
    image of Fiery Searcher on dead leaves

    Ground Beetles

    About 2,400 species in North America north of Mexico
    Photo of a Xysticus crab spider, tan individual

    Ground Crab Spiders

    Xysticus spp.
    A metallic green sweat bee gathering pollen on a yellow flowerhead

    Halictid Bees (Sweat Bees)

    More than 500 species in North America north of Mexico
    image of Red-Headed Bush Cricket crawling on leaf

    Handsome Trig (Red-Headed Bush Cricket)

    Phyllopalpus pulchellus

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