Serpulidae

Serpulidae is a family of sessile, tube-building annelid worms in the class Polychaeta. The members of this family differ from the sabellid tube worms in that they have a specialized operculum that blocks the entrance of their tubes when they withdraw into the tubes. In addition, serpulids secrete tubes of calcium carbonate. There are about 300 kn
Found on http://en.wikipedia.org/wiki/Serpulidae

Serpulidae

(from the article `feather-duster worm`) any large, segmented marine worm of the family Sabellidae (class Polychaeta, phylum Annelida). The name is also occasionally applied to members of ...
Found on http://www.britannica.com/eb/a-z/s/68
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