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brokenray

Arkansas Brokenray

Lampsilis reeveiana

Image of a female Argiope garden spider.

Black-and-Yellow Garden Spider

Argiope aurantia

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

Bryozoans (Moss Animals)

Freshwater species in the phylum Bryozoa

butterfly

Butterfly

Ellipsaria lineolata

Photo of a devil crayfish.

Devil Crayfish

Lacunicambarus aff. diogenes

Photo of a male Banded Pennant dragonfly

Dragonflies

Species in the suborder Anisoptera

elktoe

Elktoe

Alasmidonta marginata

fatmucket

Fatmucket

Lampsilis siliquoidea

Photo of a fishfly larva crawling among rocks in an aquarium.

Fishfly Larvae

Chauliodes, Neohermes, and Nigronia spp. (in eastern US)

fragile papershell

Fragile Papershell

Leptodea fragilis

Photo of a freckled crayfish.

Freckled Crayfish

Cambarus maculatus

Monkey Face Mussel

Freshwater Mussels

Bivalve molluscs in order Unionoida

Image of a giant red-headed centipede.

Giant Red-Headed Centipede

Scolopendra heros

Venomous

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

Golden Crayfish

Faxonius luteus (formerly Orconectes luteus)

Photo of a horsehair worm in an aquarium

Horsehair Worms

About 350 species scientifically described.

Photo of a longpincered crayfish.

Longpincered Crayfish

Faxonius longidigitus (formerly Orconectes longidigitus)

maple leaf

Mapleleaf

Quadrula quadrula

Narceus Millipede crawling across gravel

Millipedes

More than 900 species in North America north of Mexico

monkeyface

Monkeyface

Quadrula metanevra

mucket

Mucket

Actinonaias ligamentina

paper pondshell

Paper Pondshell (Paper Floater)

Utterbackia imbecillis

pimpleback

Pimpleback

Quadrula pustulosa

pink mucket

Pink Mucket

Lampsilis abrupta

Endangered

plain pocketbook

Plain Pocketbook

Lampsilis cardium

pond mussel

Pond Mussel

Ligumia subrostrata

Photograph of Purple Wartyback freshwater mussel shell exterior view

Purple Wartyback (Purple Pimpleback)

Cyclonaias tuberculata

scaleshell

Scaleshell

Leptodea leptodon

Endangered

Photograph of Sheepnose freshwater mussel shell exterior view

Sheepnose (Bullhead)

Plethobasus cyphyus

Endangered

image of a Carolina Grasshopper

Short-Horned Grasshoppers

About 620 species in North America

A reddish centipede crawls over a rock

Soil Centipedes

Estimated 4,000 species globally

threeridge

Threeridge

Amblema plicata

Photo of a pink planarian on a rock.

Turbellarians (Planarians; Free-Living Flatworms)

Species in genera Dugesia, Planaria, etc.

wabash pigtoe

Wabash Pigtoe

Fusconaia flava

wartyback

Wartyback

Quadrula nodulata

image of Xystodesmid Millipede crawling on a forest floor

Xystodesmid Millipedes

8 tribes, with about 23 genera, in North America north of Mexico

yellow sandshell

Yellow Sandshell

Lampsilis teres