Sabellaria, a polychaete host for the gastropods Noemiamea dolioliformis and Graphis albida

Molluscan biogeographical studies around the British Isles and along the no rth coast of France have revealed a recurring association between the tube- building polychaetes Sabellaria spp. and two marine snails: the pyramidelli d gastropod Noemiamea dolioliformis and the aclid, Graphis albida. Whilst f ew pyramidellids are considered to be host-specific, the evidence from thes e studies has shown that living animals of N. dolioliformis are only ever a ssociated with Sabellaria spp. There is also a clear relationship between G . albida and Sabellaria spp. but as yet insufficient evidence that it assoc iates only with these polychaetes.