EUNIS habitat classification 2012 amended 2019 > A - Marine habitats > A4 - Circalittoral rock and other hard substrata > A4.2 - Atlantic and Mediterranean moderate energy circalittoral rock > A4.22 - Sabellaria reefs on circalittoral rock > A4.221 - Sabellaria spinulosa encrusted circalittoral rock > A4.2212 - Sabellaria spinulosa, didemnid and small ascidians on tide-swept moderately wave-exposed circalittoral rock

Sabellaria spinulosa, didemnid and small ascidians on tide-swept moderately wave-exposed circalittoral rock

English name: Sabellaria spinulosa, didemnid and small ascidians on tide-swept moderately wave-exposed circalittoral rock

Description (English)

This variant is typically found on tide-swept, moderately wave-exposed circalittoral bedrock, boulders and cobbles subject to slight sand-scour. It occurs predominantly in the lower circalittoral. This variant normally appears as a bedrock/boulder outcrop or reef with a dense crust of the polychaete Sabellaria spinulosa and a dense turf of didemnid ascidians and scour-tolerant bryozoans such as Flustra foliacea, Pentapora foliacea and Cellaria species. There may be discreet clumps of Alcyonium digitatum and sparse sponges such as Tethya aurantium and Phorbas fictitius. Patchy occurrences of the small ascidians Polycarpa scuba, Polycarpa pomaria and Distomus variolosus may be present on the tops of rocks and boulders whilst in crevices between, the anemone Urticina felina may be found. Species such as Asterias rubens, Crossaster papposus, the serpulid worm Salmacina dysteri and the anemone Sagartia elegans are occasionally seen on the rock surface. This variant has been recorded from the Lleyn Peninsula, the Skerries and around Pembrokeshire in Wales.

Source: EUNIS habitat classification

Quick facts

EUNIS habitat type code A4.2212
Bern Convention Included in a Resolution 4 habitat type at a higher level (A4)

Vegetation types

Relation to vegetation types (syntaxa)

Not available

Species mentioned in habitat description

Invertebrates Alcyonium digitatum
Invertebrates Asterias rubens
Invertebrates Crossaster papposus
Invertebrates Distomus variolosus
Invertebrates Flustra foliacea
Invertebrates Phorbas fictitius
Invertebrates Polycarpa pomaria
Invertebrates Polycarpa scuba
Invertebrates Sabellaria spinulosa
Invertebrates Sagartia elegans
Invertebrates Salmacina dysteri
Invertebrates Tethya aurantium
Invertebrates Urticina felina
Species scientific name English common name Species group
Alcyonium digitatum Invertebrates
Asterias rubens Invertebrates
Crossaster papposus Invertebrates
Distomus variolosus Invertebrates
Flustra foliacea Invertebrates
Phorbas fictitius Invertebrates
Polycarpa pomaria Invertebrates
Polycarpa scuba Invertebrates
Sabellaria spinulosa Invertebrates
Sagartia elegans Invertebrates
Salmacina dysteri Invertebrates
Tethya aurantium Invertebrates
Urticina felina Invertebrates

Other classifications

Classification Code Habitat type name Relationship type
Marine Habitat Classification Britain/Ireland 0405 CR.MCR.CSab.Sspi.As <I>Sabellaria spinulosa</I>, didemnids and other small ascidians on tide-swept moderately wave-exposed circalittoral rock source
CORINE Land Cover 5.2.3. Sea and ocean n/a
Biodiversity Action Plan Priority Habitats (UK) 36 Sabellaria spinulosa reefs wider
For relation to plant communities (syntaxa), see Vegetation types

History

Classification Code Habitat type name Relationship type
EUNIS Habitat Classification 200410 A4.2212 Sabellaria spinulosa, didemnid and small ascidians on tide-swept moderately wave-exposed circalittoral rock same
EUNIS Habitat Classification 200308 A3.6721 Sabellaria spinulosa, didemnid and small ascidians on tide-swept moderately wave-exposed circalittoral rock same
EUNIS Habitat Classification 200202 A3.6721 Dense ascidians, bryozoans and hydroids on a crust of Sabellaria spinulosa on tide-swept circalittoral rock same
EUNIS Habitat Classification 199910 A3.6721 Dense ascidians, bryozoans and hydroids on a crust of Sabellaria spinulosa on tide-swept circalittoral rock same
MNCR BioMar 97.06 (Britain & Ireland) MCR.As.MolPol.Sab Dense ascidians, bryozoans and hydroids on a crust of Sabellaria spinulosa on tide-swept circalittoral rock same
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