Christmas tree worms, Spirobranchus giganteus, are tree-shaped 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 . They come in many colors including orange, yellow, blue, and white and, though they are small with an average 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 f
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