Very similar species to Spirobranchus triqueter, however this species is more common on the lowershore than S. triqueter. It also has one large and two small keels rather than just one. The point on the front of the animal is extremely sharp so care needs to be taken when lifting stones on beaches where these animals occur. This species is very common and can be found all around the westcountry. Images were taken at Plymouth, Devon and St. Austell, Cornwall.
Species formerly and probably more commonly known as Pomatoceros lamarckii.