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Marine Habitat Classification

Description of biotope or habitat type

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   Siphonoecetes, Nephtyidae polychaetes and venerid bivalves in circalittoral sand

Physical habitat description

Salinity Full (30-35 ppt) 
Wave exposure Moderately exposed
Tidal streams Moderate
Substratum Sand, Coarse sand
Zone Circalittoral
Depth Band 20-30 m
Other Features

Biotope origin

Derived using data from Day Grab
Faunal group Infauna

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.CFiSa.SiphNephVen <I>Siphonoecetes</I>,  Nephtyidae polychaetes and venerid bivalves in circalittoral 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.


Circalittoral shallow coarse or medium sands (with shells and gravel) characterised by a community of amphipods, Nephtyidae and bivalves. This biotope has been recorded on sandbanks to the East of Isle of Man (Irish Sea). The description of this biotope is based on infauna recorded from the above location but could be found in other areas with similar environmental conditions. The infauna was impoverished and characterised by Siphonoecetes, Sthenelais limicola, clean sand loving Nephtyidae polychaetes Aglaphamus agilis, Nephthys cirrosa and venerid bivalves Asbjornsenia pygmaea and Venus casina. This biotope was described using Day grab infaunal data and the characterising species listed will partly reflect the method used to collect data.


No situation data available.

Temporal variation

No temporal data available.

Characterising species

Taxon Relative importance of taxon for defining this community (%) % of core records where taxon was recorded Relative frequency %
Siphonoecetes 27 21-40% 28.8
Sthenelais limicola 20 1-20% 5.2
Euspira nitida 11 1-20% 5.2
Aglaophamus agilis 7 1-20% 4.9
Nephtys cirrosa 6 1-20% 4.9
Venus casina 6 1-20% 4.5
Asbjornsenia pygmaea 6 1-20% 6.2
Ophelia borealis 4 1-20% 3.6
Nucula nitidosa 3 1-20% 2
Pseudomystides limbata 1 1-20% 1.3
Nemertea 1 1-20% 3
Glycera lapidum 1 1-20% 1.6
Scoloplos 1 1-20% 1.6
Lepidepecreum longicornis 1 1-20% 1.3
Spiophanes bombyx 1 1-20% 1.3
Owenia fusiformis 1 1-20% 2.6
Nicomache 1 1-20% 1.6

Similar biotopes or habitat types

Not applicable or unknown.

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