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=Welcome to Biology= Amazing photo of the week

This is a blue Christmas Tree Worm, //Spirobranchus giganteus//. These beautiful worms appear in a host of colours including reds, yellows, pinks and white. Normally the only visible part are the tentacles, which are used for feeding and respiration. When you get too close the tentacles are retracted and an 'operculum' closes the opening. These worms live in a calcerous tube that can be buried in coral or visible on rock.