Erect sponges and Swiftia pallida on slightly tide-swept moderately exposed circalittoral rock
|Marine Habitat Classification for Britain and Ireland Version 97.06
|Circalittoral rock subject to slight tidal currents, with the seafan Swiftia pallida and various erect branching and cup sponges, including Axinella infundibuliformis, Stelligera spp. and Raspailia spp. The rocky surfaces usually have a sparse turf of hydroids including Aglaophenia tubulifera and Schizotricha frutescens, bryozoans Bugula spp., Caryophyllia smithii, Porella compressa and occasionally Alcyonium glomeratum and Diazona violacea. The feather stars Antedon bifida and Antedon petasus (the latter more numerous in deeper water than the former) and large solitary ascidians Ascidia mentula and Polycarpa pomaria (see AmenCio) are also characteristic of the less exposed sites with this biotope. Rock surfaces often with Neocrania anomala - found both in Irish and Scottish examples of this biotope. Short verticals and overhangs occasionally with Parazoanthus anguicomus. Mycale lingua recorded in deep water at some of the sites in Scottish sealochs. There are a few records from Kenmare River in SW Ireland which have Swiftia and Eunicella at the same sites. These records have been included in ErSEun although there were several other biotopes in Kenmare River which share close links with those from Scottish sealochs.
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