information on the biology of species and the ecology of habitats found around the coasts and seas of the British Isles

Alcyonium digitatum with Securiflustra securifrons on tide-swept moderately wave-exposed circalittoral rock



UK and Ireland classification

UK and Ireland classification


Found on generally moderately exposed bedrock and boulders with Alcyonium digitatum, often appearing fairly clean and grazed but with more erect species than FaAlC, including Securiflustra securifrons and Flustra foliacea. Spirobranchus is abundant at some sites, and other species include Parasmittina trispinosa, coralline crusts, Sagartia elegans, Abietinaria abietina, Leptasterias muelleri, Antedon bifida, Filograna/Salmacina and sometimes Tubularia. This biotope tends to occur in areas which are less turbid/silty than Flu.Flu and is found mainly in south-east Scotland and just across the border as well as in some sealochs. ECR.AlcC has fewer species with less Alcyonium.

Depth range

10-20 m, 20-30 m

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Sensitivity reviewHow is sensitivity assessed?



Species indicative of sensitivity


Physical Pressures

No sensitivity data available

Chemical Pressures

No sensitivity data available

Biological Pressures

No sensitivity data available

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This review can be cited as:

Stamp, T.E., 2015. [Alcyonium digitatum] with [Securiflustra securifrons] on tide-swept moderately wave-exposed circalittoral rock. In Tyler-Walters H. and Hiscock K. (eds) Marine Life Information Network: Biology and Sensitivity Key Information Reviews, [on-line]. Plymouth: Marine Biological Association of the United Kingdom. [cited 19-06-2018]. Available from:

Last Updated: 04/12/2015