EUNIS habitat classification 2017 > M - Marine benthic habitats > MC1 - Circalittoral rock > MC12 - Atlantic circalittoral rock > MC122 - Echinoderms and crustose communities on Atlantic circalittoral rock > MC1221 - Caryophyllia smithii and Swiftia pallida on Atlantic circalittoral rock > MC12211 - Caryophyllia smithii, Swiftia pallida and Alcyonium glomeratum on wave-sheltered Atlantic circalittoral rock

Caryophyllia smithii, Swiftia pallida and Alcyonium glomeratum on wave-sheltered Atlantic circalittoral rock

Description (English)

This variant typically occurs on sheltered, ridged, circalittoral bedrock or boulders subject to only weak tidal streams, but may be found in somewhat more exposed conditions. It is found in water depths ranging from 15m to 32m. Commonly occurring Swiftia pallida characterises this heavily silted biotope along with Caryophyllia smithii and frequent Alcyonium glomeratum. Under the silt, bryozoan crusts such as Parasmittina trispinosa may be found. There is a strong echinoderm component to the community, with the tentacles of Aslia lefevrei frequently seen protruding from crevices in the ridged bedrock. Holothuria forskali is often seen on the upper faces of boulders and bedrock. Marthasterias glacialis, Asterias rubens, Echinus esculentus, Henricia oculata and Luidia ciliaris may also be present. A sparse hydroid turf may also be present, with species such as Polyplumaria frutescens, Halecium halecinum and Nemertesia antennina. In addition, there may be anthozoans such as Isozoanthus sulcatus and Corynactis viridis. The sponge Suberites carnosus is typically associated with a heavily silted habitat. Other sponges present include Cliona celata, Stelligera stuposa and Polymastia boletiformis. The only records are from the west coast of Ireland.
Situation: Usually found on bedrock ridges and outcrops surrounded by sand and muddy gravel.

Source: EUNIS habitat classification

Quick facts

EUNIS habitat type code MC12211
Relation to Resolution 4 habitat type (used for designation of Emerald sites)

Vegetation types

Relation to vegetation types (syntaxa)

Not available

Species mentioned in habitat description

Invertebrates Aslia lefevrei
Invertebrates Asterias rubens
Invertebrates Caryophyllia smithii
Invertebrates Cliona celata
Invertebrates Corynactis viridis
Invertebrates Echinus esculentus
Invertebrates Henricia oculata
Invertebrates Holothuria forskali
Invertebrates Isozoanthus sulcatus
Invertebrates Luidia ciliaris
Invertebrates Marthasterias glacialis
Invertebrates Nemertesia antennina
Invertebrates Parasmittina trispinosa
Invertebrates Polymastia boletiformis
Invertebrates Stelligera stuposa
Invertebrates Suberites carnosus
Species scientific name English common name Species group
Aslia lefevrei Invertebrates
Asterias rubens Invertebrates
Caryophyllia smithii Invertebrates
Cliona celata Invertebrates
Corynactis viridis Invertebrates
Echinus esculentus Invertebrates
Henricia oculata Invertebrates
Holothuria forskali Invertebrates
Isozoanthus sulcatus Invertebrates
Luidia ciliaris Invertebrates
Marthasterias glacialis Invertebrates
Nemertesia antennina Invertebrates
Parasmittina trispinosa Invertebrates
Polymastia boletiformis Invertebrates
Stelligera stuposa Invertebrates
Suberites carnosus Invertebrates

Other classifications

Classification Code Habitat type name Relationship type
EUNIS Habitat Classification 2007 (revised descriptions 2012) A4.2111 Caryophyllia smithii, Swiftia pallida and Alcyonium glomeratum on wave-sheltered circalittoral rock same
For relation to plant communities (syntaxa), see Vegetation types

History

Classification Code Habitat type name Relationship type Comment
EUNIS Habitat Classification 200410 A4.2111 Caryophyllia smithii, Swiftia pallida and Alcyonium glomeratum on wave-sheltered circalittoral rock same
EUNIS Habitat Classification 200308 A3.614 Erect sponges and Swiftia pallida on slightly tide-swept moderately exposed circalittoral rock wider
EUNIS Habitat Classification 200202 A3.614 Erect sponges and Swiftia pallida on slightly tide-swept moderately exposed circalittoral rock overlap
EUNIS Habitat Classification 199910 A3.614 Erect sponges and Swiftia pallida on slightly tide-swept moderately exposed circalittoral rock overlap
MNCR BioMar 97.06 (Britain & Ireland) MCR.XFa.ErSSwi Erect sponges and Swiftia pallida on slightly tide-swept moderately exposed circalittoral rock overlap
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