EUNIS habitat classification 2017 > M - Marine benthic habitats > MC2 - Circalittoral biogenic habitat > MC22 - Atlantic circalittoral biogenic habitat > MC223 - Bivalve reefs in the Atlantic circalittoral zone > MC2232 - Modiolus modiolus beds on open coast Atlantic circalittoral mixed sediment

Modiolus modiolus beds on open coast Atlantic circalittoral mixed sediment

Description (English)

Muddy gravels and coarse sands in deeper water of continental seas may contain venerid bivalves with beds of Modiolus modiolus. The clumping of the byssus threads of the M. modiolus creates a stable habitat that attracts a very rich infaunal community with a high density of polychaete species including Glycera lapidum, Paradoneis lyra, Aonides paucibranchiata, Laonice bahusiensis, Protomystides bidentata, Lumbrineris spp., Mediomastus fragilis and syllids such as Exogone spp. and Sphaerosyllis spp. Bivalves such as Spisula elliptica, Timoclea ovata and other venerid species are also common. Brittlestars such as Amphipholis squamata may also occur with this community. This biotope is very similar to MD4-211 and the 'boreal off-shore gravel association' and the 'deep Venus community' described by previous workers (Ford 1923; Jones 1951). Similar Modiolus beds (though with a less diverse infauna) on open coast stable boulders, cobbles and sediment are described under MC1-221.

Source: EUNIS habitat classification

Quick facts

EUNIS habitat type code MC2232
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 Aonides paucibranchiata
Invertebrates Laonice bahusiensis
Invertebrates Mediomastus fragilis
Invertebrates Modiolus modiolus
Invertebrates Paradoneis lyra
Species scientific name English common name Species group
Aonides paucibranchiata Invertebrates
Laonice bahusiensis Invertebrates
Mediomastus fragilis Invertebrates
Modiolus modiolus Invertebrates
Paradoneis lyra Invertebrates

Other classifications

Classification Code Habitat type name Relationship type
EUNIS Habitat Classification 2007 (revised descriptions 2012) A5.622 Modiolus modiolus beds on open coast circalittoral mixed sediment same
For relation to plant communities (syntaxa), see Vegetation types

History

Classification Code Habitat type name Relationship type Comment
EUNIS Habitat Classification 200410 A5.622 Modiolus modiolus beds on open coast circalittoral mixed sediment same
EUNIS Habitat Classification 200202 A4.442 Modiolus modiolus beds on circalittoral mixed sediment same
EUNIS Habitat Classification 199910 A4.492 Modiolus modiolus beds on circalittoral mixed sediment same
EUNIS Habitat Classification 199811 A4.92 Modiolus modiolus beds on circalittoral mixed sediment same
MNCR BioMar 97.06 (Britain & Ireland) CMX.ModMx Modiolus modiolus beds on circalittoral mixed sediment same
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