Mediterranean Fanworm - Sabella Spallanzanii Royalty-Free Stock Photo

European fan worms grow to a total length of 9 to 40 cm 4 to 16 in and are usually larger in deep water. They have stiff, sandy tubes formed from hardened mucus secreted by the worm which protrude from the sand, and a two-layered crown of feeding tentacles which can be retracted into the tube.