Musculus niger

{{Short description|Species of bivalve}}

{{Speciesbox

| image = FMIB 51188 Black Horse Mussel, Modiola nigra.jpeg

| genus = Musculus

| species = niger

| authority = (Gray, 1824)

}}

Musculus niger, or the black mussel, is a species of bivalve mollusc in the family Mytilidae. It can be found in the Atlantic Ocean, eastern Pacific Ocean, and the Arctic Ocean. Along the Atlantic coast of North America, it ranges from the Arctic Ocean to North Carolina.Abbott, R.T. & Morris, P.A. A Field Guide to Shells: Atlantic and Gulf Coasts and the West Indies. New York: Houghton Mifflin, 1995. 19.