Who would have thought that worms can be so colorful?
Found on coral reefs in tropical waters worldwide, these worms are
not only the most interesting looking; they also are the most beautiful.
Spirobranchus giganteus, commonly called Christmas tree worms, are
small Christmas tree-shaped serpulid tube-dwelling worm with spectacular
twin spirals of plumes used for feeding and respiration. Though tiny in
its less than 1 ½ in (3.8 cm) size, its cone-like shape and magnificent
twin spiral plumage called radioles makes it widely admired and easily
recognized by divers.
Spirobranchus means “spiral gills”, referring to the worms unique crown.
Christmas tree worms come in a wide variety of colors including
orange, yellow, blue and white as well as different color combinations.
Though the spectacular plumes are visible, most of the worm’s body is
anchored in its burrow that it bores into live calcareous coral.
undersea creatures are ultra sensitive to disturbances that even a
passing shadow can cause an instant retraction into its hideaway. The
plumes usually re-emerge about a minute later, very slowly, to test the
water before fully extending all its glory.
They are commonly found embedded in entire heads of massive corals.
Like members of its family, serpulidae, it can secrete a calcareous tube
around its body, which serves as its home and protection.
Spirobranchus giganteus are filter feeders. They use their
beautifully-colored radioles to filter microorganisms in the water,
which are then delivered straight into their digestive tract.
These sedentary inhabitants of the deep reproduce by casting their
eggs and sperm into the water where they are fertilized and develop into
larvae that settle on coral heads and burrow into the coral.
* All images by Nick Hobgood/Wikimedia