Cyclocardia borealis, or the northern cardita or northern cyclocardia, is a species of marine bivalve in the family Carditidae. It can be found along the Atlantic coast of North America, ranging from the Arctic Ocean to Cape Hatteras.Abbott, R.T. & Morris, P.A. A Field Guide to Shells: Atlantic and Gulf Coasts and the West Indies. New York: Houghton Mifflin, 1995. 45. It is also known from Japan. It occurs at depths of .
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