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 > MC2234 - Modiolus modiolus beds with Chlamys varia, sponges, hydroids and bryozoans on slightly tide-swept very sheltered Atlantic circalittoral mixed substrata

Modiolus modiolus beds with Chlamys varia, sponges, hydroids and bryozoans on slightly tide-swept very sheltered Atlantic circalittoral mixed substrata

Description (English)

Dense Modiolus modiolus beds, covered by hydroids and bryozoans, on soft gravelly, shelly mud with pebbles in areas of slight or moderate tidal currents. The variable scallop (Chlamys varia) is frequently found in large numbers amongst the Modiolus shells. Hydroids such as Halecium spp. and Kirchenpaueria pinnata and ascidians such as Ascidiella aspersa, Corella parallelogramma and Ciona intestinalis may be found attached to pebbles or mussel shells. The echinoderms Ophiothrix fragilis and Antedon bifida are often frequent in this biotope as is the encrusting polychaete Pomatoceros triqueter. Similar communities have been found on cobble and pebble plains in stable, undisturbed conditions in some sealochs, although not all these examples have Modiolus beds.

Source: EUNIS habitat classification

Quick facts

EUNIS habitat type code MC2234
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 Antedon bifida
Invertebrates Ascidiella aspersa
Invertebrates Chlamys varia
Invertebrates Ciona intestinalis
Invertebrates Corella parallelogramma
Invertebrates Kirchenpaueria pinnata
Invertebrates Modiolus modiolus
Invertebrates Ophiothrix fragilis
Invertebrates Pomatoceros triqueter
Species scientific name English common name Species group
Antedon bifida Invertebrates
Ascidiella aspersa Invertebrates
Chlamys varia Invertebrates
Ciona intestinalis Invertebrates
Corella parallelogramma Invertebrates
Kirchenpaueria pinnata Invertebrates
Modiolus modiolus Invertebrates
Ophiothrix fragilis Invertebrates
Pomatoceros triqueter Invertebrates

Other classifications

History

Classification Code Habitat type name Relationship type Comment
EUNIS Habitat Classification 200410 A5.624 Modiolus modiolus beds with Chlamys varia, sponges, hydroids and bryozoans on slightly tide-swept very sheltered circalittoral mixed substrata same
EUNIS Habitat Classification 200308 A3.721 Modiolus modiolus beds with Chlamys varia, sponges, hydroids and bryozoans on slightly tide-swept very sheltered circalittoral mixed substrata same
EUNIS Habitat Classification 200202 A3.721 Modiolus modiolus beds with Chlamys varia, sponges, hydroids and bryozoans on slightly tide-swept very sheltered circalittoral mixed substrata same
EUNIS Habitat Classification 199910 A3.721 Modiolus modiolus beds with Chlamys varia, sponges, hydroids and bryozoans on slightly tide-swept very sheltered circalittoral mixed substrata same
MNCR BioMar 97.06 (Britain & Ireland) SCR.Mod.ModCvar Modiolus modiolus beds with Chlamys varia, sponges, hydroids and bryozoans on slightly tide-swept very sheltered circalittoral mixed substrata same
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