Tubicola

Tubicola, the tube-bearing worms of the class Chaetopoda (q.v.). It includes the Serpula, which is is very common on rocks and shells all round the English coast; in the allied Spirorbis, which is abundant on seaweed, the tube is also calcareous, but is coiled in a small disc. In some members of the group the tube is membranous and free, as in Pectinaria, and in others it is formed of sand-grains as in Sabella. The members of the group are all marine or estuarine.