Found all around the UK and relatively common in Spring, especially in tide-swept areas. Facelina bostoniensis feeds primarily on the polyps of the hydroids, particularly Tubularia. Large specimens may be 5cms. They have orange, red or reddish-brown cerata arranged in clumps along the sides and back of the body. The oral tentacles are yery long.
St. Abbs Marine Reserve, Scotland. North Sea