Editing Sipuncula (section)

==Behaviour==
Most sipunculans are deposit feeders employing a number of different methods to obtain their foods. Those living in burrows extend their tentacles over the surface of the sediment. Food particles get trapped in mucous secretions and the beating of cilia transport the particles to the mouth. Among those that burrow through the sand, the tentacles are replaced by fluted folds which scoop up sediment and food particles. Most of this material is swallowed but larger particles are discarded. Species dwelling in crevices are able to withdraw their introverts, blocking the crevice entrance with their thickened trunks and presumably ingesting any food they have snared at the same time. One species, ''[[Thysanocardia procera]]'' is thought to be [[Carnivore|carnivorous]], gaining entrance in some way to the interior of the sea mouse ''[[Aphrodita aculeata]]'' and sucking out its liquefied contents.<ref name=Walls/>