Sparse sponges, Nemertesia spp., and Alcyonidium diaphanum on circalittoral mixed substrata

English name: Sparse sponges, Nemertesia spp., and Alcyonidium diaphanum on circalittoral mixed substrata

Description (English)

This biotope is found on moderately wave-exposed sand-scoured, circalittoral boulders, cobbles and pebbles that are subject to moderately strong tidal streams (referred to as lag-cobbles locally). It is characterised by sparse sponges and a diverse bryozoan and hydroid turf. The sparse sponge community is primarily composed of Dysidea fragilis and Scypha ciliata. The mixed faunal turf is composed of Nemertesia antennina, Nemertesia ramosa, Halecium halecinum, Sertularia argentea, Alcyonium digitatum, Bugula flabellata, Bugula turbinata, Bugula plumosa, Flustra foliacea, Cellepora pumicosa, Alcyonidium diaphanum, Cellaria fistulosa and crisiid bryozoans. The anemones Epizoanthus couchii, Sagartia elegans and Cerianthus lloydii may also be recorded. Echinoderms such as the starfish Asterias rubens, Crossaster papposus, Henricia oculata and the crinoid Antedon bifida. Other species present include the colonial ascidian Clavelina lepadiformis, the barnacle Balanus crenatus, the top shell Gibbula cineraria, the polychaete Pomatoceros triqueter, the ascidian Morchellium argus, Prosthecareus vittatus and the crab Cancer pagurus. It is distributed off Pen Llyn and over considerable areas of the Irish Sea.

Source: EUNIS habitat classification

Quick facts

EUNIS habitat type code A4.135
Bern Convention Included in a Resolution 4 habitat type at a higher level (A4)

Vegetation types

Relation to vegetation types (syntaxa)

Not available

Species mentioned in habitat description

Invertebrates Alcyonidium diaphanum
Invertebrates Alcyonium digitatum
Invertebrates Antedon bifida
Invertebrates Asterias rubens
Invertebrates Balanus crenatus
Invertebrates Bugula flabellata
Invertebrates Bugula plumosa
Invertebrates Bugula turbinata
Invertebrates Cancer pagurus
Invertebrates Cellaria fistulosa
Invertebrates Cellepora pumicosa
Invertebrates Clavelina lepadiformis
Invertebrates Crossaster papposus
Invertebrates Dysidea fragilis
Invertebrates Epizoanthus couchii
Invertebrates Flustra foliacea
Invertebrates Gibbula cineraria
Invertebrates Henricia oculata
Invertebrates Nemertesia antennina
Invertebrates Nemertesia ramosa
Invertebrates Pomatoceros triqueter
Invertebrates Sagartia elegans
Invertebrates Sertularia argentea
Species scientific name English common name Species group
Alcyonidium diaphanum Invertebrates
Alcyonium digitatum Invertebrates
Antedon bifida Invertebrates
Asterias rubens Invertebrates
Balanus crenatus Invertebrates
Bugula flabellata Invertebrates
Bugula plumosa Invertebrates
Bugula turbinata Invertebrates
Cancer pagurus Invertebrates
Cellaria fistulosa Invertebrates
Cellepora pumicosa Invertebrates
Clavelina lepadiformis Invertebrates
Crossaster papposus Invertebrates
Dysidea fragilis Invertebrates
Epizoanthus couchii Invertebrates
Flustra foliacea Invertebrates
Gibbula cineraria Invertebrates
Henricia oculata Invertebrates
Nemertesia antennina Invertebrates
Nemertesia ramosa Invertebrates
Pomatoceros triqueter Invertebrates
Sagartia elegans Invertebrates
Sertularia argentea Invertebrates

Other classifications

Classification Code Habitat type name Relationship type
Marine Habitat Classification Britain/Ireland 0405 CR.HCR.XFa.SpNemAdia Sparse sponges, <I>Nemertesia</I> spp. and <I>Alcyonidium diaphanum</I> on circalittoral mixed substrata 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 A4.135 Sparse sponges, Nemertesia spp., and Alcyonidium diaphanum on circalittoral mixed substrata same
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