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Admirable Grasshopper on grass stem

Admirable Grasshopper

Syrbula admirabilis

Photo of an alcohol inky mushroom cut in half lengthwise.

Alcohol Inky

Coprinopsis atramentaria (formerly Coprinus atramentarius)

Edible

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

Alderfly Larvae

Sialis spp.

Alligator gar side view photo with black background

Alligator Gar

Atractosteus spatula (formerly Lepisosteus spatula)

Image of alligator snapping turtle

Alligator Snapping Turtle

Macrochelys temminckii

Photo of a blusher, a tan gilled mushroom, showing injured spot turning rust red

Amanitas

Amanita spp. (about 600 species, worldwide)

Poisonous

Jagged ambush bug on a plant stem

Ambush Bugs

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

Venomous

Image of American Bullfrog

American Bullfrog

Lithobates catesbeianus (formerly Rana catesbeiana)

American snout butterfly resting with wings folded

American Snout

Libytheana carinent

Photo of a marbled orbweaver spider

Angulate and Roundshouldered Orbweavers

Araneus spp.

image of Walker's Cicada clinging to a perch

Annual Cicadas

Neotibicen spp. (in Missouri) (formerly Tibicen)

Photo of adult antlion with wings spread

Antlion Adults

More than 100 species in North America north of Mexico

image of Antlion Larva on rock

Antlion Larvae (Doodlebug Larvae)

More than 100 species in North America north of Mexico

several yellow aphids on plant

Aphids

More than 1,300 species in North America north of Mexico

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 spotted fishing spider perched on the water's surface amid floating duckweed plants

Aquatic Spiders

Dolomedes spp., Tetragnatha spp., and others

brokenray

Arkansas Brokenray

Lampsilis reeveiana

Arkansas darter, female, side view photo with black background

Arkansas Darter

Etheostoma cragini

Photo of a triangle orbweaver, or arrowhead spider

Arrowhead Spider (Triangle Orbweaver)

Verrucosa arenata

Photo of artist conk, woody bracket fungus on tree shown from side

Artist Conk

Ganoderma applanatum

Photo of two ash tree boletes, tan pored mushrooms, one overturned showing pores

Ash Tree Bolete

Boletinellus merulioides

Edible

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

Photo of backswimmer, side view

Backswimmers

About 32 North American species in the family Notonectidae

Banded sculpin side view photo with black background

Banded Sculpin

Cottus carolinae

image of Bee Fly on leaf

Bee Flies

About 800 species in North America

Photo of a belted crayfish, also called Big River crayfish.

Belted Crayfish (Big River Crayfish)

Faxonius harrisonii (formerly Orconectes harrisonii)

Photo of Berkeley's polypore, fresh, young specimen.

Berkeley’s Polypore

Bondarzewia berkeleyi

Edible

Photo of a Big Creek crayfish.

Big Creek Crayfish

Faxonius peruncus (formerly Orconectes peruncus)

No photo available

Big Laughing Gym (Big Laughing Jim)

Gymnopilus junonius (formerly G. spectabilis)

Poisonous

Photo of two gigantic red false morels, cut and laying on a ground

Big Red False Morel

Gyromitra caroliniana

Poisonous

image of a Toad Bug

Big-Eyed Toad Bug

Gelastocoris oculatus

Bighead carp side view photo with black background

Bighead Carp

Hypophthalmichthys nobilis

Invasive

Bigmouth buffalo side view photo with black background

Bigmouth Buffalo

Ictiobus cyprinellus

Photo of broken bolete mushroom cap, being held to show pores

Bitter Bolete

Tylopilus felleus

Black buffalo side view photo with black background

Black Buffalo

Ictiobus niger

Black carp side view photo with black background

Black Carp

Mylopharyngodon piceus

Invasive

Photograph of a black morel mushroom

Black Morel

Morchella angusticeps (formerly M. elata)

Edible

Photo of two black trumpets, dark brown vase-shaped mushrooms on mossy ground

Black Trumpet

Craterellus cornucopioides (C. fallax)

Edible

Photo of black-footed polypore, mature specimens, with photographer's foot.

Black-Footed Polypore

Polyporus badius

Photo of black-staining polypore, a mushroom with tan, wavy, fan-shaped caps

Black-Staining Polypore

Meripilus sumstinei (formerly M. giganteus)

Edible

Blackspotted topminnow side view photo with black background

Blackspotted Topminnow

Fundulus olivaceus

Blackstripe topminnow, male in spawning colors, side view photo with black background

Blackstripe Topminnow

Fundulus notatus

Photo of cluster of bleeding mycenas, small, capped, reddish mushrooms

Bleeding Mycena

Mycena haematopus

Blewits

Blewit

Lepista nuda (Clitocybe nuda; Tricholoma nudum)

Edible

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 blusher, a tan gilled mushroom, showing injured spot turning rust red

Blusher

Amanita rubescens

Boreal Chorus Frog

Boreal Chorus Frog

Pseudacris maculata

Image of a broad-banded watersnake

Broad-Banded Watersnake

Nerodia fasciata confluens

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