Mytilus leucophaeatus Conrad, 1831 Mytilopsis leucophaeata is a species of small bivalve mollusc in the false mussel family, Dreissenidae.

It can look very similar to the zebra mussel, with similar stripes, but it can be distinguished from it by an apophysis or projection on the inside of the shell near the umbo.

[4] This species is native in the Gulf of Mexico,[5] and spread from there via ballast water, or attached to oysters that were moved, to the Hudson River in the 1930s,[6][7] and from there to other estuaries in the eastern US including Chesapeake Bay[8] as well as to the Pernambuco coast in northeastern Brazil.

[10] Like the zebra mussel, this species is a significant biofouling pest in many countries, especially where it has been introduced in Europe.

It attaches to hard substrates, including oyster and true mussel shells and cages for them, rocks, boats, and pilings, and also to ropes.