Musculus discors

{{Short description|Species of bivalve}}

{{Speciesbox

| image = Crenella discors (Sowerby).jpg

| genus = Musculus

| species = discors

| authority = (Linnaeus, 12th edition of Systema Naturae, 1767)

}}

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.{{cite web|title=Musculus discors (Linnaeus, 1767)|url=https://www.gbif.org/species/5188853|website=www.gbif.org|publisher=Global Biodiversity Information Facility|accessdate=20 February 2017}} It is a global IUCN Red List species, and of national conservation importance within Great Britain.{{cite web|title=Green crenella (Musculus discors)|url=http://www.marlin.ac.uk/species/detail/1645|website=Marlin|publisher=The Marine Life Information Network|accessdate=20 February 2017}}