Biodiversity & Conservation

Mytilus edulis and piddocks on eulittoral firm clay


<i>%Mytilus edulis%</i> and piddocks on eulittoral firm clay
Distribution map

LR.MLR.MytPid 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 The biotope is recorded in the River Blackwater in Essex, the Swale in Kent and in Morecambe Bay, Lancashire.
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

Clay outcrops in the mid to lower eulittoral that are bored by a variety of piddocks including Pholas dactylus, Barnea candida and Petricola pholadiformis. The surface of the clay is characterized by small clumps of the mussel Mytilus edulis, the barnacle Elminius modestus and the winkle Littorina littorea. Seaweeds are generally sparse on the clay, although small patches of the red seaweeds Mastocarpus stellatus, Halurus flosculosus and Ceramium spp. can occur, usually attached to loose-lying cobbles or mussel shells. Also the green seaweeds Ulva spp. including Ulva lactuca may be present. The polychaete Lanice conchilega can sometimes be present in the clay, while the crustacean Carcinus maenas is present as well. More data required to validate this biotope. (Information taken from the revised Marine Habitat Classification, Version 04.05: Connor et al., 2004.).

Additional information icon Additional information

This review can be cited as follows:

Marshall, C.E. 2008. Mytilus edulis and piddocks on eulittoral firm clay. Marine Life Information Network: Biology and Sensitivity Key Information Sub-programme [on-line]. Plymouth: Marine Biological Association of the United Kingdom. [cited 01/12/2015]. Available from: <>