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At-Risk Aquatic Invertebrates

A western pearlshell mussel's shell is partially open, revealing blue and orange fringe.
Western pearlshell mussel (Margaritifera falcata). (Photo: Marie Fernandez)

Invertebrates live in every type of aquatic habitat, from streams and seeps to marshes and lakes. Aquatic invertebrates such as stoneflies, mayflies, mussels, and midges play critical roles in sustaining healthy aquatic ecosystems, and are at the center of the aquatic food web. The winged adult forms of many aquatic insects also provide a huge amount of the food for terrestrial birds, bats, and reptiles.

Unfortunately, aquatic invertebrates and the habitats that sustain them are seriously imperiled. In the United States, over half of the wetlands that existed in the 1600s have been lost, and a recent nationwide stream survey found pesticides or their degradates in all the streams sampled. The Xerces Society's endangered species program works to protect aquatic invertebrates and the ecosystems that sustain them. Scroll down or use the search tools to learn more about these important species.

 

Name search (partial name okay)
Juga newberryi
A freshwater snail
USA: OR
Capnia arapahoe
Arapahoe snowfly
USA: CO
Megalagrion nigrohamatum nigrolineatum
Blackline Hawaiian damselfly
USA: HI
Leucorrhinia borealis
Boreal whiteface
USA: AK, MN, MT, ND, UT, WA, WY
Canada: AB, BC, MB, NT, ON, SK, YT
Megalagrion leptodemas
Crimson Hawaiian damselfly
USA: HI
Somatochlora franklini
Delicate emerald
USA: AK, MI, MN, NH, NY, VT, WA, WI
Canada: AB, BC, MB, NB, NL, NS, NT, PE, ON, QC, SK, YT
Megalagrion nesiotes
Flying earwig Hawaiian damselfly
USA: HI
Ephydatia cooperensis
Freshwater Sponge
USA: MT
Fisherola nuttalli
Giant Columbia River Limpet
USA: ID, MT, OR, WA
Canada: BC
Capnia zukeli
Idaho stonefly
USA: ID
Caurinella idahoensis
Lolo Mayfly
USA: ID, MT
Baetis moqui
Moqui Minnow Mayfly
USA: UT
Megalagrion oceanicum
Oceanic Hawaiian damselfly
USA: HI
Megalagrion xanthomelas
Orangeblack Hawaiian damselfly
USA: HI
Pyrgulopsis fresti
Owyhee hot springsnail
USA: OR
Gomphus kurilis
Pacific clubtail
USA: CA, OR, WA
Megalagrion pacificum
Pacific Hawaiian damselfly
USA: HI
Capnia lineata
Straight stonefly
USA: ID
Ochrotrichia susanae
Susan’s Purse-Making Caddisfly
USA: CO
Haliotis sorenseni
White abalone
USA: CA
Erpetogomphus compositus
White-belted ringtail
USA: AZ, CA, ID, NV, NM, OR, TX, UT, WA, WY
Somatochlora whitehousei
Whitehouse’s emerald
USA: MT, WA
Canada: AB, BC, MB, NL, ON, QC, SK, YT