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In sheltered muddy sandy gravel with appreciable quantities of surficial cobbles, pebbles and shells a community similar to SS.SMx.CMx.ClloMx may develop with frequent Cerianthus lloydii and other burrowing anemones. However, the pebbles and cobbles embedded in the sediment are colonised by hydroids and, in particular, Nemertesia antennina and N. ramosa. Other hydroids may include Kirchenpaueria pinnata and Halecium halecinum whilst ascidians such as Ascidiella aspersa or Corella parallelogramma may also be present locally. Pecten maximus and Spirobranchus triqueter may also be frequent in certain areas.