Key:  Family Chamidae

Taken primarily from  Kozloff, 1987, 1996  (Copyright 1987, 1996, University of Washington Press.  Used in this web page by permission of University of Washington Press)

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1a	Shell attached to the substratum by its right valve; shell white, sometimes with red or green markings; concentric lamellae often raised up into spinelike projections (not likely to be found north of Oregon)	Pseudochama exogyra
1b	Shell attached by its left valve; exterior waxy-translucent, sometimes with pink or red streaks; concentric lamellae close-set, generally foliaceous	Chama (Chama) arcana