Musculus discors (Linnaeus 1767)

Filter feeder.

Mucous eggs are in bags made from byssal threads; Development without pelagic larvae

Periostracum olive-green to dark-brown, shiny

Epibenthic. Use byssal threads for attachment to the substratum; Upper sublitoral; On algae and hard substrates mainly; Widespread boreal - arctic species.

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, 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.

Gulf of St. Lawrence (unspecified region), Saguenay Fjord, northern Gaspe waters, southern Gaspe waters (Baie des Chaleurs, Gaspe Bay to American, Orphan and Bradelle banks; eastern boundary: Eastern Bradelle Valley), Magdalen Islands (from Eastern Bradelle valley to the west, as far as Cape North, including the Cape Breton Channel), downstream part of middle St. Lawrence estuary, lower St. Lawrence estuary, lower North Shore; middle North Shore (from Sept- Iles to Cape Whittle, including the Mingan Islands); Cobscook Bay

Circumboreal

bathyal, infralittoral and circalittoral of the Gulf and estuary