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Neocrania anomala and Protanthea simplex on very wave-sheltered circalittoral rock

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English name Neocrania anomala and Protanthea simplex on very wave-sheltered circalittoral rock Open code browser    Diagram icon

EUNIS habitat type code   A4.3141 Level   6
Edition   EUNIS Habitat Classification 2012 - a revision of the habitat classification descriptions.

Description ( English )

This variant typically occurs on deep, lower circalittoral bedrock or boulder slopes (often-vertical walls) in the landward, very sheltered basins of fjordic sealochs. In these very sheltered conditions, there are frequently dense populations of the anemone Protanthea simplex growing on the silty boulder or rock slope, and on the tubes of the parchment worm Chaetopterus variopedatus. The underlying rock surfaces are usually covered with encrusting red algae, the polychaete Pomatoceros triqueter, the brachiopod Neocrania anomala, the saddle oyster Pododesmus patelliformis and the conspicuous fan worm Sabella pavonina. Scattered colonies of Alcyonium digitatum are occasionally present along with the hydroid Bougainvillia ramosa. The barnacle Balanus balanus and the hermit crab Pagurus bernhardus is occasionally seen on boulder or rock surface, whilst underneath in crevices, the squat lobster Munida rugosa may be present. A diverse range of solitary ascidians, typically found in sheltered conditions, are often present including Ciona intestinalis, Corella parallelogramma, Polycarpa pomaria, Ascidia mentula and Ascidia virginea. Echinoderms such as brittlestars Ophiothrix fragilis are frequently seen with their arms protruding from crevices in the rock, whilst the starfish Asterias rubens, the sea urchin Echinus esculentus and Psammechinus miliaris are occasionally found on the boulder or rock surface. The whelk Buccinum undatum is often present but in very low numbers. Situation: Where this biotope occurs on vertical rock cliffs, you tend to find silted sugar kelp Laminaria saccharina communities above A4.314, in the infralittoral zone (A3.313). Where A4.314 occurs on a rock or boulder slope and due to the very sheltered nature of the habitat, it is common to find a mud plain community where slope ends (A5.3). Species such as the seapen Funiculina quadrangularis, the anemone Cerianthus lloydii and the Norway lobster Nephrops norvegicus are typically abundant.

Source

Connor, D.W., Allen, J.H., Golding, N., Howell, K.L., Lieberknecht, L.M., Northen, K.O. & Reker, J.B. [edited ETC/BD] (2004)

External links


Relationships with other classifications

Classification Code Title Relation type
EUNIS Habitat Classification 200410 A4.3141 [Neocrania anomala] and [Protanthea simplex] on very wave-sheltered circalittoral rock same
EUNIS Habitat Classification 200308 A3.7151 Brachiopods, calcareous tubeworms ([Placostegus tridentatus], [Hydroides]) and sponges on variable salinity circalittoral rock overlap
EUNIS Habitat Classification 200308 A3.7152 [Neocrania anomala], [Dendrodoa grossularia] and [Sarcodictyon roseum] on reduced or low salinity circalittoral rock overlap
EUNIS Habitat Classification 200202 A3.7151 Brachiopods, calcareous tubeworms ([Placostegus tridentatus], [Hydroides]) and sponges on variable salinity circalittoral rock overlap
EUNIS Habitat Classification 200202 A3.7152 [Neocrania anomala], [Dendrodoa grossularia] and [Sarcodictyon roseum] on reduced or low salinity circalittoral rock overlap
EUNIS Habitat Classification 199910 A3.7151 Brachiopods, calcareous tubeworms ([Placostegus tridentatus], [Hydroides]) and sponges on variable salinity circalittoral rock overlap
EUNIS Habitat Classification 199910 A3.7152 [Neocrania anomala], [Dendrodoa grossularia] and [Sarcodictyon roseum] on reduced or low salinity circalittoral rock overlap
CORINE Land Cover 5.2.3. Sea and ocean n/a
Marine Habitat Classification Britain/Ireland 0405 CR.LCR.BrAs.NeoPro.FS Neocrania anomala and Protanthea simplex on very wave-sheltered circalittoral rock source
MNCR BioMar 97.06 (Britain & Ireland) SCR.BrAs.NeoPro.CaTw Brachiopods, calcareous tubeworms ([Placostegus tridentatus], [Hydroides]) and sponges on variable salinity circalittoral rock overlap
MNCR BioMar 97.06 (Britain & Ireland) SCR.BrAs.NeoPro.Den [Neocrania anomala], [Dendrodoa grossularia] and [Sarcodictyon roseum] on reduced or low salinity circalittoral rock overlap
  A Marine habitats Go to key navigator, starting with this habitat    Ancestor
  A4 Circalittoral rock and other hard substrata Go to key navigator, starting with this habitat    Ancestor
  A4.3 Atlantic and Mediterranean low energy circalittoral rock    Ancestor
  A4.31 Brachiopod and ascidian communities on circalittoral rock    Ancestor
  A4.314 [Neocrania anomala] and [Protanthea simplex] on sheltered circalittoral rock    Parent
EUNIS

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