See text The Serpulidae are a family of sessile, tube-building annelid worms in the class Polychaeta.

In addition, serpulids secrete tubes of calcium carbonate.

About 300 species in the family Serpulidae are known, all but one of which live in saline waters.

It has an affinity for carbon monoxide which is 570 times as strong as that of the haemoglobin found in human blood.

[5] Empty serpulid shells can sometimes be confused with the shells of a family of marine gastropod mollusks, the Vermetidae or worm snails.