Biodiversity & Conservation

Polyides rotundus and/or Furcellaria lumbricalis on reduced salinity infralittoral rock



Image Anon. - A turf of Polyides rotundus, Furcellaria lumbricalis and filamentous brown algae. Image width ca 1m.
Image copyright information

Distribution map

IR.SIR.Lag.PolFur recorded (dark blue bullet) and expected (light blue bullet) distribution in Britain and Ireland (see below)

  • EC_Habitats

Text page icon Habitat description

Map icon Distribution of biotope in Britain and Ireland SIR.PolFur has been recorded from the mainland and islands of the west coast of Scotland, the Shetland Islands and the Orkney Islands. Likely to occur in the sea lochs of Ireland, for example Lough Ine.
National importance Rare

Text page icon Description of biotope

For a full description of this biotope including characterizing species, distribution, survey information and references visit JNCC

Bedrock and boulders characterized by a dense turf of Polyides rotundus and/or Furcellaria lumbricalis, often with a dense mat of filamentous seaweeds. Associated with these seaweeds are the ascidians Clavelina lepadiformis and Distaplia rosea. (Information taken from the Marine Biotope Classification for Britain and Ireland, Version 97.06: Connor et al., 1997a, b).

Additional information icon Additional information

This review can be cited as follows:

Rayment, W.J. 2001. Polyides rotundus and/or Furcellaria lumbricalis on reduced salinity infralittoral rock. Marine Life Information Network: Biology and Sensitivity Key Information Sub-programme [on-line]. Plymouth: Marine Biological Association of the United Kingdom. [cited 27/11/2015]. Available from: <>