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Marine Habitat Classification

Description of biotope or habitat type

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   Cerianthus lloydii and other burrowing anemones in circalittoral muddy mixed sediment

Physical habitat description

Salinity Full (30-35 ppt)
Wave exposure Exposed, Moderately exposed, Sheltered, Very sheltered
Tidal streams Moderately strong (1-3 kn), Weak (>1 kn), Very weak (negligible)
Substratum Sandy muddy gravel
Zone Circalittoral, Infralittoral
Depth Band 5-10 m, 10-20 m, 20-30 m
Other Features

Download comparative physical and biological data. The comparative tables enable a rapid comparison of the species composition and principal physical characteristics between a given set of biotopes.

Distribution of habitat SS.SMx.CMx.ClloMx <I>Cerianthus lloydii</I> and other burrowing anemones in circalittoral muddy mixed sediment

  • Records used to define the biotope (core records)
  • Other records assigned to this biotope, marked as 'certain'
  • Other records assigned to this biotope, marked as 'uncertain'
  • Predicted extent of the level 3 (for sublittoral rock & deep sea) or 4 (for sublittoral sediment) habitat

Point data based on records in the UK Marine Recorder Snapshot. Predicted habitat extent is from UKSeaMap.


Circalittoral plains of sandy muddy gravel may be characterised by burrowing anemones such as Cerianthus lloydii. Other burrowing anemones such as Cereus pedunculatus, Mesacmaea mitchellii and Aureliania heterocera may be locally abundant. Relatively few conspicuous species are found in any great number in this biotope but typically they include ubiquitous epifauna such as Asterias rubens, Pagurus bernhardus and Liocarcinus depurator with occasional terebellid polychaetes such as Lanice conchilega and also the clam Pecten maximus. Ophiura albida may be frequent in some areas, and where surface shell or stones are present ascidians such as Ascidiella aspersa may occur in low numbers.


No situation data available.

Temporal variation

No temporal data available.

Characterising species

Taxon Relative importance of taxon for defining this community (%) Typical abundance - SACFOR scale % of core records where taxon was recorded
Cerianthus lloydii 59 Frequent 81-100 %
Urticina felina 1 Occasional 1-20 %
Terebellidae 1 Occasional 21-40 %
Lanice conchilega 3 Occasional 21-40 %
Pagurus bernhardus 5 Occasional 41-60 %
Liocarcinus depurator 4 Frequent 21-40 %
Pecten maximus 2 Occasional 21-40 %
Asterias rubens 8 Occasional 41-60 %
Ophiura albida 1 Frequent 21-40 %
Ascidiella aspersa 1 Occasional 21-40 %
Callionymus lyra 1 Occasional 21-40 %

Similar biotopes or habitat types

The current biotope is closely related to ClloModHo but lacks Modiolus and holothurians.

In areas of similar sediment but with a higher proportion of surface pebbles, cobbles and shells ClloMx is replaced by SMX.ClloMx.Nem

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