Margaritifera falcata (Gould, 1850) Western Pearlshell

Margaritifera falcata (Gould, 1850) Western Pearlshell

Margaritifera falcata (Gould, 1850) Western Pearlshell

From gravel bottom, Long Creek, Lake County, Oregon, by Tom Grace 8/5/2006 (80 mm.)