Phoronids: Phoronida

Adult phoronids live along coastlines, from the zones that are affected by the tides, rarely going deeper than 180 feet (54 meters). A few species have been found at depths of approximately 1,310 feet (400 meters). They live inside flexible, layered, parchmentlike tubes. Some species live alone, buried straight up and down in sand, mud, or fine gravel. Others live in large groups, their tangled tubes often covering rocks and shells. They are free to leave their tubes and make another one somewhere else. One species intertwines its tube with that of a tube-living sea anenome. Some species do not make a tube. They bore into rock and live inside the tunnel.