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Marine Habitat Classification

Description of biotope or habitat type

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   Owenia fusiformis and Amphiura filiformis in offshore circalittoral sand or muddy sand

Physical habitat description

Salinity Full (30-35 ppt)
Wave exposure
Tidal streams
Substratum Slightly muddy sand.
Zone Circalittoral
Depth Band
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.SSa.OSa.OfusAfil <I>Owenia fusiformis</I> and <I>Amphiura filiformis</I> in offshore circalittoral sand or muddy sand

  • 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.


Areas of slightly muddy sand (generally <20% mud) in offshore waters may be characterised by high numbers of the tube building polychaete Owenia fusiformis often with the brittlestar Amphiura filiformis. Whilst O. fusiformis is also found in other circalittoral or offshore biotopes it usually occurs in lower abundances than in SSA.OfusAfil. Other species found in this community are the polychaetes Goniada maculata, Pholoe inornata, Diplocirrus glaucus, Chaetozone setosa and Spiophanes kroyeri with occasional bivalves such as Timoclea ovata and Thyasira equalis. The sea cucumber Labidoplax buski and the cumacean Eudorella truncatula are also commonly often found in this biotope.


No situation data available.

Temporal variation

No temporal data available.

Characterising species

Characterising species data not applicable.

Similar biotopes or habitat types

Maldanid polychaetes may also occur in the current biotope but never in the same abundance as in MalEdef.

Classification history of this biotope or habitat type

Classification version Code
97.06 IMX.LsacX
96.7 SIR.Lsac.X

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