Christmas Tree Worm Class. Calcareous tube can reach up to 20 cm in length and is usually deeply embedded in the coral skeleton. Christmas tree worms are polychaetes, a class of mostly aquatic worms that have colonized virtually every corner of the ocean, including the frigid abyssal plain and the steamy waters.

Eol has data for 32 attributes,. It lives on tropical coral reefs and resembles a fluffy fir.