EUNIS habitat classification 2012 amended 2019 > A - Marine habitats > A4 - Circalittoral rock and other hard substrata > A4.1 - Atlantic and Mediterranean high energy circalittoral rock > A4.13 - Mixed faunal turf communities on circalittoral rock > A4.132 - Corynactis viridis and a mixed turf of crisiids, Bugula, Scrupocellaria, and Cellaria on moderately tide-swept exposed circalittoral rock

Corynactis viridis and a mixed turf of crisiids, Bugula, Scrupocellaria, and Cellaria on moderately tide-swept exposed circalittoral rock

English name: Corynactis viridis and a mixed turf of crisiids, Bugula, Scrupocellaria, and Cellaria on moderately tide-swept exposed circalittoral rock

Quick facts

EUNIS habitat type code A4.132
Bern Convention Included in a Resolution 4 habitat type at a higher level (A4)

Description (English)

This biotope typically occurs on wave-exposed, vertical or steep, circalittoral bedrock or large boulders, usually subject to moderate or strong tidal streams. It is characterised by dense aggregations of the anemone Corynactis viridis and the cup coral Caryophyllia smithii intermixed with a short bryozoan turf of one or more Crisia spp., Scrupocellaria spp., Bugula spp. and Cellaria spp. Occasionally, this turf obscures the underlying C. virdis and C. smithii. Cushion and encrusting sponges, particularly Pachymatisma johnstonia, Cliona celata, Esperiopsis fucorum and Dysidea fragilis, are present in moderate amounts at many sites. The axinellid sponges Stelligera spp. and Raspailia spp. are less frequently recorded. Clumps of large hydroids such as Nemertesia antennina and Nemertesia ramosa as well as the soft coral Alcyonium digitatum and the bryozoan Alcyonidium diaphanum may be found covering the hard substratum. The anemones Actinothoe sphyrodeta and Sagartia elegans are typically present in low numbers, while the hard `coral' Pentapora foliacea is also occasionally observed. The most frequently recorded echinoderms are Marthasterias glacialis and Asterias rubens, although other species such as Echinus esculentus may also be seen. The rocky substratum may have a patchy covering of encrusting red seaweeds/algae. The crabs Necora puber and Cancer pagurus may be seen in crevices or under overhangs. This biotope is regularly recorded around south west England and Wales, often on vertical rock faces.
Situation: Due to its wave-exposed nature, kelp park and forest biotopes (units A3.115 and A3.111) are commonly found in the infralittoral zone shallower than this biotope, and feature species such as Laminaria hyperborea, Sacchoriza polyschides and Alaria esculenta.

Source: EUNIS habitat classification

Vegetation types

Relation to vegetation types (syntaxa)

Not available

Species mentioned in habitat description

Algae Alaria esculenta
Algae Laminaria hyperborea
Invertebrates Actinothoe sphyrodeta
Invertebrates Alcyonidium diaphanum
Invertebrates Alcyonium digitatum
Invertebrates Asterias rubens
Invertebrates Cancer pagurus
Invertebrates Caryophyllia smithii
Invertebrates Cliona celata
Invertebrates Corynactis viridis
Invertebrates Dysidea fragilis
Invertebrates Echinus esculentus
Invertebrates Esperiopsis fucorum
Invertebrates Marthasterias glacialis
Invertebrates Necora puber
Invertebrates Nemertesia antennina
Invertebrates Nemertesia ramosa
Invertebrates Pachymatisma johnstonia
Invertebrates Sagartia elegans
Species scientific name English common name Species group
Alaria esculenta Algae
Laminaria hyperborea Algae
Actinothoe sphyrodeta Invertebrates
Alcyonidium diaphanum Invertebrates
Alcyonium digitatum Invertebrates
Asterias rubens Invertebrates
Cancer pagurus Invertebrates
Caryophyllia smithii Invertebrates
Cliona celata Invertebrates
Corynactis viridis Invertebrates
Dysidea fragilis Invertebrates
Echinus esculentus Invertebrates
Esperiopsis fucorum Invertebrates
Marthasterias glacialis Invertebrates
Necora puber Invertebrates
Nemertesia antennina Invertebrates
Nemertesia ramosa Invertebrates
Pachymatisma johnstonia Invertebrates
Sagartia elegans Invertebrates

Other classifications

Classification Code Habitat type name Relationship type
Marine Habitat Classification Britain/Ireland 0405 CR.HCR.XFa.CvirCri <I>Corynactis viridis</I> and a mixed turf of crisiids, <I>Bugula</I>, <I>Scrupocellaria</I>, and <I>Cellaria</I> on moderately tide-swept exposed circalittoral rock source
CORINE Land Cover 5.2.3. Sea and ocean n/a
For relation to plant communities (syntaxa), see Vegetation types

History

Classification Code Habitat type name Relationship type
EUNIS Habitat Classification 200410 A4.132 Corynactis viridis and a mixed turf of crisiids, Bugula, Scrupocellaria, and Cellaria on moderately tide-swept exposed circalittoral rock same
EUNIS Habitat Classification 200308 A3.512 Corynactis viridis and a mixed turf of crisiids, Bugula, Scrupocellaria, and Cellaria on moderately tide-swept exposed circalittoral rock same
EUNIS Habitat Classification 200202 A3.512 Corynactis viridis and a crisiid/Bugula/Cellaria turf on steep or vertical exposed circalittoral rock same
EUNIS Habitat Classification 199910 A3.512 Corynactis viridis and a crisiid/Bugula/Cellaria turf on steep or vertical exposed circalittoral rock same
MNCR BioMar 97.06 (Britain & Ireland) ECR.EFa.CorCri Corynactic viridis and a crisiid/Bugula/Cellaria turf on steep or vertical exposed circalittoral rock same
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