Spirobranchus giganteus also called Christmas Tree Worms are shaped like Christmas trees. You will receive 2 or more worms in a rock.
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These tube dwelling serpulid worms have with magnificent blue to purple spirals of plumes which are the way these worms feed and breathe. While the worm plumage is small (average 1-1.5 inches in length, the coloration is striking with bright yellow accents against the purple. They are very sensitive to disturbances and will rapidly retract into their burrows at the slightest touch or as I am trying to photograph them.