Bispira is a genus of tube-dwelling polychaete worms belonging to the family Sabellidae. It lives mainly on rocky substrata and reaches a length of up to 10cm.
Like other sabellid worms, gas exchange is through a crown of tentacles that also serve as a filtration-feeding system. The worm has no mobility outside the confines of the tube, and the filtration mechanism is susceptible to clogging if excessive suspended solids are present [source].
Animalia - Annelida - Polychaeta - Canalipalpata - Sabellidae - Bispira