The calcerous tubeworm is a tube-dwelling, filter-feeding worm.
The fan worm lives in a slightly bended calcareous tube
at the bottom of shallow seas.
The tube is attached to a hard surface such as a rocks or bivalve shell.
the fanworm and danger
The worm has many tentacles that spread out into feathery fans.
These fans are used to collect plancton. The head has also eyes: when these eyes detect a shadow the worm retracts itself into the tube and closes it with
the promotorium, a white cover.
distribution of the calcareous tubeworm
The calcareous tubeworm lives in every ocean and almost everery sea.
For example in the northeast Atlantic Ocean, like the Irish sea, the North sea and the Mediterranean Sea.
The fan worm lives in depths 250 meters.
Serpula vermicularis is dioecious, with separate male and female sexes.
The swimming larva is called a trochophore: it is part of the plankton and capable to feed itself with algae.
Both mollusks and annelids share a larval form called a trochophore
The presence of a trochophore in both mollusks and annelids suggests that they share a ancestor.
Trochophore larvae have a characteristic mode of feeding, where small
particles are captured between two ciliary bands, and carried to the mouth by a food
groove. They tend to swim to the surface.