THE XERCES SOCIETY FOR INVERTEBRATE CONSERVATION

Aquatic Invertebrates in Pacific Northwest Freshwater Wetlands
An Identification Guide and Educational Resource
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  Identify taxaMolluscaVeneroidaUncommon in wetlands
       
 

Corbicula
(asian clam)
Shells are rounded, large, thick, and very durable; the growth rings are raised such that they feel like small ridges - introduced into many rivers

  
       
  Dreissena
(zebra and quagga mussels)
Shell is triangular with a flat side, and fairly tough with light and dark markings - highly invasive, but not currently in the Northwest		  
 
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