The Christmas Tree Worm (Spirobranchus giganteus) is found throughout tropical waters from the shallows to 30 meters (100 feet) deep and can be yellow, blue, purple, red, orange, or brown. The two spirals are a single worm. This worm is growing into living lobe coral (Porites lobata); if you look closely, you can see the ring of 12 tentacles surrounding the mouth of each polyp.

This worm was photographed in about 35 feet of water off the south Kohala Coast near the Mauna Lani Resort on the Big Island of Hawaii.