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Marine Habitat Classification

Description of biotope or habitat type

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   Crustose sponges and colonial ascidians with Dendrodoa grossularia or barnacles on wave-surged infralittoral rock

Physical habitat description

Salinity Full (30-35 ppt)
Wave exposure Extremely exposed, Very exposed, Exposed, Moderately exposed
Tidal streams Strong (3-6 kn), Moderately strong (1-3 kn), Weak (>1 kn), Very weak (negligible)
Substratum Bedrock
Zone Infralittoral, Sublittoral fringe
Depth Band 0-5 m, 5-10 m, 10-20 m
Other Features Surge gullies and caves

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 IR.FIR.SG.CrSpAsDenB Crustose sponges and colonial ascidians with <I>Dendrodoa grossularia</I> or barnacles on wave-surged infralittoral rock

  • 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.


Vertical and overhanging, exposed to moderately exposed bedrock gullies, tunnels and cave entrances subject to wave surge, and dominated by the crustose sponges Halichondria panicea, Myxilla incrustans, Clathrina coriacea, Leucosolenia botryoides, Esperiopsis fucorum and Grantia compressa. There may also be dense aggregations of the anthozoan Sagartia elegans, dwarf Metridium senile, Alcyonium digitatum, and Urticina felina, and a dense covering of the barnacle Balanus crenatus on the bare rock face. Dense aggregations of the robust hydroid Tubularia indivisa may be recorded, growing through the sponge crust. Colonial ascidians such as Polyclinum aurantium, Botryllus schlosseri, Botrylloides leachi, Aplidium nordmanni and the solitary ascidian Dendrodoa grossularia may all be recorded. The echinoderms Asterias rubens, Echinus esculentus, Henricia sp., the crab Cancer pagurus and the calcareous tubeworm Pomatoceros triqueter may also be present on the rock face, along with encrusting coralline algae.


No situation data available.

Temporal variation


Characterising species

Taxon Relative importance of taxon for defining this community (%) Typical abundance - SACFOR scale % of core records where taxon was recorded
Clathrina coriacea 3 Frequent 41-60 %
Leucosolenia botryoides 1 Occasional 21-40 %
Grantia compressa 1 Frequent 21-40 %
Halichondria panicea 6 Frequent 61-80 %
Esperiopsis fucorum 1 Frequent 21-40 %
Myxilla incrustans 4 Occasional 61-80 %
Tubularia indivisa 5 Frequent 41-60 %
Alcyonium digitatum 3 Occasional 41-60 %
Urticina felina 2 Occasional 41-60 %
Metridium senile 4 Occasional 41-60 %
Sagartia elegans 7 Frequent 61-80 %
Pomatoceros triqueter 3 Frequent 41-60 %
Balanus crenatus 7 Frequent 61-80 %
Caprellidea 2 Common 21-40 %
Cancer pagurus 4 Occasional 61-80 %
Bryozoa indet crusts 1 Frequent 21-40 %
Henricia 1 Occasional 21-40 %
Asterias rubens 3 Occasional 41-60 %
Echinus esculentus 1 Occasional 41-60 %
Polyclinum aurantium 5 Frequent 41-60 %
Aplidium nordmanni 2 Occasional 21-40 %
Didemnidae 1 Frequent 21-40 %
Dendrodoa grossularia 2 Frequent 41-60 %
Botryllus schlosseri 4 Occasional 61-80 %
Botrylloides leachi 4 Occasional 21-40 %
Corallinaceae 3 Frequent 41-60 %

Similar biotopes or habitat types



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