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

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. Serpulids are most imp...
Found on http://en.wikipedia.org/wiki/Serpulidae
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