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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, Amphilectus fucorum and Grantia compressa. There may also be dense aggregations of the anthozoan Cylista 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 leachii, 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 Spirobranchus 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
Balanus crenatus 7 Frequent 61-80%
Cylista elegans 7 Frequent 61-80%
Halichondria panicea 6 Frequent 61-80%
Polyclinum aurantium 5 Frequent 41-60%
Tubularia indivisa 5 Frequent 41-60%
Botrylloides leachii 4 Occasional 21-40%
Botryllus schlosseri 4 Occasional 61-80%
Cancer pagurus 4 Occasional 61-80%
Metridium senile 4 Occasional 41-60%
Myxilla incrustans 4 Occasional 61-80%
Corallinaceae 3 Frequent 41-60%
Alcyonium digitatum 3 Occasional 41-60%
Asterias rubens 3 Occasional 41-60%
Clathrina coriacea 3 Frequent 41-60%
Spirobranchus triqueter 3 Frequent 41-60%
Aplidium nordmanni 2 Occasional 21-40%
Caprelloidea 2 Common 21-40%
Dendrodoa grossularia 2 Frequent 41-60%
Urticina felina 2 Occasional 41-60%
Bryozoa indet crusts 1 Frequent 21-40%
Didemnidae 1 Frequent 21-40%
Amphilectus fucorum 1 Frequent 21-40%
Grantia compressa 1 Frequent 21-40%
Henricia 1 Occasional 21-40%
Leucosolenia botryoides 1 Occasional 21-40%
Echinus esculentus 1 Occasional 41-60%

Similar biotopes or habitat types



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