Clams

Up to ¾” long

fleshy body enclosed between two clamped together shells (if clam is alive, shells cannot be pried apart without harming clam)

somewhat tolerant of impairment

Illustrations from: Voshell, J. R., Jr. 2002. Guide to the Common Freshwater Invertebrates of North America. MacDonald and Woodward Publishing Co. With permission of the author.