JOHN MARAVENTANO / SCIENCE PHOTO LIBRARY JOHN MARAVENTANO / SCIENCE PHOTO LIBRARY
Christmas Tree Worm, Spirobranchus giganteus, common throughout the tropics. It has colored tentacles that can be red, blue, purple, yellow or green. When the tentacles are withdrawn the tube can be plugged with a plate to protect the worm. Photographed in Grand Cayman.
Model release not required. Property release not required.