SPECIES ID / InvertebratesMusselss'óx̱we• Have 2 shell halves joined at a hinge• Hold shells slightly open with sipons protruding to filter feed• Larvae are parasitic on fish gills, which allows them to colonize new areas• Adults may live for many decades• Most types are sensitive to pollution• Many freshwater mussels are in decline or already endangered Asian Clam Fingernail Clams Floaters Western Pearlshell––––––Primary Information Source:Voshell, J. Reese. 2002. A Guide to Common Freshwater Invertebrates of North America. McDonald and Woodward Publishing Company. Blacksburg, Virginia.