Tube worm

A tubeworm is any worm-like sessile invertebrate that anchors its tail to an underwater surface and secretes around its body a mineral tube, into which it can withdraw its entire body.

Tubeworms are found among the following taxa:
 * Annelida, the phylum containing segmented worms
 * Polychaetea, the class containing bristle worms
 * Canalipalpata, the order containing bristle-footed annelids or fan-head worms
 * Siboglinidae, the family of beard worms
 * Riftia pachyptila, a species known as giant tube worms
 * Lamellibrachia, a genus
 * Serpulidae, a family
 * Sabellidae, the family containing feather duster worms
 * Phoronida, the phylum containing horseshoe worms
 * Microconchida, an order of extinct tubeworms
 * Kuphus polythalamia, a bivalve mollusk species whose common name is giant tube worm