EUNIS habitat classification 2017 > M - Marine benthic habitats > MC1 - Circalittoral rock > MC12 - Atlantic circalittoral rock > MC125 - Communities on Atlantic circalittoral soft rock > MC1252 - Polydora sp. tubes on moderately exposed Atlantic circalittoral soft rock

Polydora sp. tubes on moderately exposed Atlantic circalittoral soft rock

Description (English)

Large patches of chalk and soft limestone are occasionally covered entirely by Polydora sp. tubes to the exclusion of almost all other species. This tends to occur in highly turbid conditions and spans the infralittoral and circalittoral in limestone areas such as the Great and Little Ormes (North Wales) and Gower (South Wales). It is even present on the lower shore in the Severn estuary. The boring form of the sponge Cliona celata often riddles the surface layer of the stone. Other sponges present include Halichondria panicea, Haliclona oculata and Hymeniacidon perleve. Polydora sp. also frequently occurs in small patches as part of other biotopes (e.g. unit MC1-216). Other species present include Alcyonium digitatum, Sarcodictyon roseum, the hydroids Halecium halecinum, Abietinaria abietina and Tubularia indivisa, the ascidians Clavelina lepadiformis, Botryllus schlosseri and Morchellium argus, the anemones Urticina felina, Metridium senile and Sagartia elegans and the bryozoans Flustra foliacea and a crisiid turf. The starfish Asterias rubens, the crabs Inachus phalangium and Carcinus maenas, the polychaete Pomatoceros triqueter, the barnacle Balanus crenatus and the brittlestar Ophiothrix fragilis may also be seen. Please note: this biotope may extend into the infralittoral and littoral zone in areas where water turbidity is sufficiently high.

Source: EUNIS habitat classification

Quick facts

EUNIS habitat type code MC1252
Relation to Resolution 4 habitat type (used for designation of Emerald sites)

Vegetation types

Relation to vegetation types (syntaxa)

Not available

Species mentioned in habitat description

Invertebrates Abietinaria abietina
Invertebrates Alcyonium digitatum
Invertebrates Asterias rubens
Invertebrates Balanus crenatus
Invertebrates Botryllus schlosseri
Invertebrates Carcinus maenas
Invertebrates Clavelina lepadiformis
Invertebrates Cliona celata
Invertebrates Flustra foliacea
Invertebrates Halichondria panicea
Invertebrates Haliclona oculata
Invertebrates Inachus phalangium
Invertebrates Metridium senile
Invertebrates Pomatoceros triqueter
Invertebrates Sagartia elegans
Invertebrates Sarcodictyon roseum
Invertebrates Tubularia indivisa
Invertebrates Urticina felina
Species scientific name English common name Species group
Abietinaria abietina Invertebrates
Alcyonium digitatum Invertebrates
Asterias rubens Invertebrates
Balanus crenatus Invertebrates
Botryllus schlosseri Invertebrates
Carcinus maenas Invertebrates
Clavelina lepadiformis Invertebrates
Cliona celata Invertebrates
Flustra foliacea Invertebrates
Halichondria panicea Invertebrates
Haliclona oculata Invertebrates
Inachus phalangium Invertebrates
Metridium senile Invertebrates
Pomatoceros triqueter Invertebrates
Sagartia elegans Invertebrates
Sarcodictyon roseum Invertebrates
Tubularia indivisa Invertebrates
Urticina felina Invertebrates

Other classifications

Classification Code Habitat type name Relationship type
EUNIS Habitat Classification 2007 (revised descriptions 2012) A4.232 Polydora sp. tubes on moderately exposed sublittoral soft rock same
For relation to plant communities (syntaxa), see Vegetation types

History

Classification Code Habitat type name Relationship type Comment
EUNIS Habitat Classification 200410 A4.232 Polydora sp. tubes on moderately exposed sublittoral soft rock same
EUNIS Habitat Classification 200308 A3.682 Polydora sp. tubes on upward-facing circalittoral soft rock same
EUNIS Habitat Classification 200202 A3.682 Polydora sp. tubes on upward-facing circalittoral soft rock same
EUNIS Habitat Classification 199910 A3.682 Polydora sp. tubes on upward-facing circalittoral soft rock same
MNCR BioMar 97.06 (Britain & Ireland) MCR.SfR.Pol Polydora sp. tubes on upward-facing circalittoral soft rock same
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