“Sea Mat” (Membranipora membranacea)
Also sometimes known as the “lacy crust bryozoan”, M. membranacea is a species of Membraniporid marine bryozoan which is widely distributed throughout the Northeast Atlantic, North Sea, and Mediterranean Sea. It also occurs in the North Pacific, ranging from Alaska to California. Like many other bryozoans M. membranacea is colonial, with many individual zooids forming a large mat-like colony. Individual M. membranacea, like other bryozoans, are suspension feeders using their lophophores to gather nutrients.