Description: Microscopic, small branched filaments on the surface and penetrating shells of Littorina littoralis.

Habitat: Endozoic in marine Littorina in the periostracumand the calcareous parts of the firm shell surface. Mid to low littoral

Distribution: British Isles: has been found on all shores examined where there is Littorina. Europe: Spain, France, Netherlands, Baltic and Norway. Atlantic coast of North America: Canada, Maine and Massachusetts.

Similar Species: Microscopic examination required for identification.

Distribution Map from NBN: Tellamia contorta at National Biodiversity Network mapping facility, data for UK.

iNaturalist: Tellamia contorta at iNaturalist World Species Observations database.

WoRMS: Tellamia contorta at World Register of Marine Species.