Musculus discors, or the discord mussel, is a species of bivalve mollusc in the family Mytilidae. It can be found along the Atlantic coast. In North America it ranges from Labrador to Long Island Sound,Abbott, R.T. & Morris, P.A. A Field Guide to Shells: Atlantic and Gulf Coasts and the West Indies. New York: Houghton Mifflin, 1995. 18. around Alaska and in northern European waters, including around most of the coast of Britain. It is a global IUCN Red List species, and of national conservation importance within Great Britain.
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