Blue Christmas Tree Worm

Description:

"Christmas tree worms, Spirobranchus giganteus, are Christmas tree-shaped serpulid tube-dwelling worms with magnificent twin spirals of plumes used for feeding and respiration. These cone-shaped worms are one of the most widely recognized sedentary polychaete worms . They come in many colors including orange, yellow, blue, and white and, though they are small with an average 3.8 cm in span, they are easily spotted due to their shape, beauty, and color. The colorful plumes, or tentacles, are used for passive feeding on suspended food particles and plankton in the water. The plumes are also used for respiration. Though the plumes are visible, most of these worms is anchored in their burrows that they bore into live calcareous coral. Christmas tree worms are very sensitive to disturbances and will rapidly retract into their burrows at the slightest touch or passing shadow. They typically re-emerge a minute later, very slowly, to test the water before fully extending their plumes." Source: http://marinebio.org/species.asp?id=543

Habitat:

Spirobranchus giganteus is commonly found embedded in entire heads of massive corals, such as stony corals like Porites and brain corals. Caribbean to Indo-Pacific

Notes:

Morning dive at a depth of about 5 m. Halo Anilao house reef, Batangas, Philippines