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Marine Habitat Classification

Description of biotope or habitat type

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   Protodorvillea kefersteini and other polychaetes in impoverished circalittoral mixed gravelly sand

Physical habitat description

Salinity Full (30-35 ppt)
Wave exposure Exposed, Moderately exposed
Tidal streams
Substratum Medium to coarse sand with some gravel or shell, and a fine sand or mud fraction
Zone Infralittoral
Depth Band 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.SCS.CCS.Pkef <I>Protodorvillea kefersteini</I> and other polychaetes in impoverished circalittoral mixed gravelly 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.


In coarse gravelly or shelly sand sometimes with a slight mud content, along open coasts in depths of 10 to 30m, and in shallower offshore areas, an impoverished community characterised by Protodorvillea kefersteini may be found. This biotope has a number of other species associated with it including Nemertea spp., Caulleriella zetlandica, Minuspio cirrifera, Glycera lapidum, Ampelisca spinipes and numerous other polychaete species all occurring at low abundances. The polychaete Sabellaria spinulosa is also found in low numbers in this biotope


This biotope has been reported in the North Sea along the Norfolk/Lincolnshire coast located in and around marine aggregate dredging areas (IECS, 1999).

Temporal variation

This biotope may be quite variable both spatially and temporally in terms community structure and also sediment type which is often borderline between the SCS complex and the SMX complex.

Characterising species

Taxon Relative importance of taxon for defining this community (%) Typical abundance - SACFOR scale Typical abundance - (count per m2) % of core records where taxon was recorded
Nemertea 14 Common 23 61-80 %
Nematoda 2 11 21-40 %
Pholoe synophthalmica 5 12 41-60 %
Hesionura elongata 2 8 21-40 %
Glycera lapidum 6 11 41-60 %
Exogone verugera 6 Frequent 17 21-40 %
Nereis longissima 3 9 41-60 %
Protodorvillea kefersteini 17 33 61-80 %
Scoloplos armiger 2 10 21-40 %
Minuspio cirrifera 7 15 41-60 %
Caulleriella zetlandica 12 26 61-80 %
Notomastus latericeus 1 Frequent 7 21-40 %
Sabellaria spinulosa 3 6 41-60 %
Terebellidae 2 7 21-40 %
Ampelisca spinifer 7 37 41-60 %
Brachyura 2 6 21-40 %

Similar biotopes or habitat types

MedLumVen is more diverse than the current biotope and it is possible that Pkef is a disturbed or transitional variant of the MedLumVen due to dredging activities or storm events.

As for MedLumVen.

A deep water variant of Pkef

PoVen is an offshore version of Pkef.

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