Photo of a northern watersnake rearing back in grass on land.

    Northern Watersnake

    Nerodia sipedon sipedon
    Photo of a nursery web spider on a plant

    Nursery Web Spiders

    Pisaurina spp.
    Olive hairstreak butterfly taking nectar from butterfly weed flowers

    Olive Hairstreak (Juniper Hairstreak)

    Callophrys gryneus gryneus (syn. Mitoura gryneus gryneus)
    Photo of orange pinwheel marasmius, tiny, orange, pleated, gilled mushroom

    Orange Pinwheel Marasmius

    Marasmius siccus
    Photo of an Orange Wing moth

    Orange Wing

    Mellilla xanthometata
    Black snake with orange and yellow stripes crossing a gravel road.

    Orange-Striped Ribbonsnake

    Thamnophis proximus proximus
    Orangethroat darter female, side view photo with black background

    Orangethroat Darter

    Etheostoma spectabile
    Photo of an ornate box turtle walking.

    Ornate Box Turtle

    Terrapene ornata ornata
    Ouachita map turtle

    Ouachita Map Turtle

    Graptemys ouachitensis ouachitensis
    image of a Four-Spotted Owlfly

    Owlflies

    There are 8 species in North America
    Photo of oyster mushrooms growing on a tree trunk

    Oyster Mushroom

    Pleurotus ostreatus and P. pulmonarius
    fork and knife icon

    Edible

    Photo of an Ozark crayfish.

    Ozark Crayfish

    Faxonius ozarkae (formerly Orconectes ozarkae)
    No photo available

    Ozark Zigzag Salamander

    Plethodon angusticlavius
    Photo of a Painted Lady

    Painted Lady

    Vanessa cardui
    image of Paper Wasp on flowers

    Paper Wasps

    Species in the genus Polistes
    Photo of a parasol mushroom.

    Parasol

    Macrolepiota procera (Lepiota procera)
    fork and knife icon

    Edible

    Peacock fly resting on a thistle leaf

    Peacock Flies (Tephritid Fruit Flies)

    About 300 species in North America north of Mexico
    Photo of many crowded pear-shaped puffballs growing on a stump.

    Pear-Shaped Puffball

    Lycoperdon pyriforme (Morganella pyriformis)
    fork and knife icon

    Edible

    Photo of a pearl crescent

    Pearl Crescent

    Phyciodes tharos
    Photo of a Peck's Skipper

    Peck's Skipper

    Polites peckius
    Photo of a periodical cicada shown from the side.

    Periodical Cicadas

    Magicicada spp.
    Image of a pickerel frog

    Pickerel Frog

    Lithobates palustris (formerly Rana palustris)
    Photo of a picture-winged fly

    Picture-Winged Flies

    About 130 species in North America north of Mexico
    Photo of a pigskin puffball.

    Pigskin Puffball (Common Earthball)

    Scleroderma citrinum (Scleroderma aurantium)
    Poisonous Icon

    Poisonous

    Photo of a sowbug (left) and pillbug (right).

    Pillbugs and Sowbugs (Land Isopods)

    Land-dwelling members of the crustacean order Isopoda
    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
    Image of a yellow-bellied watersnake

    Plain-Bellied Watersnake

    Nerodia erythrogaster
    Photo of a plains gartersnake taken in Lakewood, Colorado.

    Plains Gartersnake

    Thamnophis radix
    Image of a plains hog-nosed snake

    Plains Hog-Nosed Snake

    Heterodon nasicus nasicus
    Photo of a plains leopard frog in grass.

    Plains Leopard Frog

    Lithobates blairi (formerly Rana blairi)
    Image of a plains spadefoot

    Plains Spadefoot

    Spea bombifrons
    Citrus flatid planthopper on twig

    Planthoppers

    More than 900 species in North America north of Mexico
    image of Plume Moth on blade of grass

    Plume Moths

    Nearly 150 species in North America north of Mexico
    Photo of a Polyphemus Moth

    Polyphemus Moth

    Antheraea polyphemus
    pond mussel

    Pond Mussel

    Ligumia subrostrata
    prairie kingsnake

    Prairie Kingsnake

    Lampropeltis calligaster calligaster
    prairie lizard

    Prairie Lizard

    Sceloporus consobrinus
    Image of a massasauga

    Prairie Massasauga

    Sistrurus tergeminus tergeminus
    Venomous Icon

    Venomous

    exclamation mark

    Endangered

    Image of a prairie ring-necked snake

    Prairie Ring-Necked Snake

    Diadophis punctatus arnyi
    Photo of a predaceous diving beetle

    Predaceous Diving Beetles (Water Tigers)

    Species in the beetle family Dytiscidae
    image of a White-Headed Prominent moth

    Prominent Moths

    About 50 species recorded from Missouri
    Image of a deceased pseudoscorpion on a US dime

    Pseudoscorpions

    Various species in the order Pseudoscorpionida
    Photograph of Purple Wartyback freshwater mussel shell exterior view
    Photo of a male redlegged purseweb spider walking on limestone gravel

    Purseweb Spiders

    Sphodros spp.
    image of a Yellow-Fringed Dolichomia Moth

    Pyralid Moths

    More than 680 species in North America north of Mexico

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