Biodiversity & Conservation

Ocnus planci aggregations on sheltered sublittoral muddy sediment

SS.SMu.IFiMu.Ocn


IMU.Ocn

Image Dominic Counsell - Aggregation of Ocnus planci on broken shell and cobbles. Image width ca 40 cm.
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Distribution map

SS.SMu.IFiMu.Ocn recorded (dark blue bullet) and expected (light blue bullet) distribution in Britain and Ireland (see below)


  • EC_Habitats

For a list of 2004 characterising species please see the JNCC website.

Map icon UK and Ireland classification

Major habitat SS Sublittoral sediment
Habitat complex SS.SMu Sublittoral cohesive mud and sandy mud communities
Biotope complex SS.SMu.IFiMu Infralittoral fine mud
Biotope SS.SMu.IFiMu.Ocn Ocnus planci aggregations on sheltered sublittoral muddy sediment

Additional information icon Additional information

European Union Nature Information System (EUNIS) habitat classification: A4.314/B-IMU.MarMu.Ocn - Ocnus planci aggregations on sheltered sublittoral muddy sediment (Davies & Moss, 1998).

This biotope is similar to £IMU.PhiVir£ (Philine aperta and Virgularia mirabilis in soft stable infralittoral mud) and in Carlingford Lough occurs where hard substrata (shell debris, cobbles and pebbles) provide attachment for epifauna such as ascidians, sponges and tubeworms and allows aggregations of Ocnus to develop.


This review can be cited as follows:

Tyler-Walters, H. 2002. Ocnus planci aggregations on sheltered sublittoral muddy sediment. Marine Life Information Network: Biology and Sensitivity Key Information Sub-programme [on-line]. Plymouth: Marine Biological Association of the United Kingdom. [cited 23/07/2014]. Available from: <http://www.marlin.ac.uk/habitatclassification.php?habitatid=325&code=2004>