EUNIS habitat classification 2012 amended 2019 > A - Marine habitats > A5 - Sublittoral sediment > A5.6 - Sublittoral biogenic reefs > A5.62 - Sublittoral mussel beds on sediment > A5.621 - Modiolus modiolus beds with hydroids and red seaweeds on tide-swept circalittoral mixed substrata

Modiolus modiolus beds with hydroids and red seaweeds on tide-swept circalittoral mixed substrata

English name: Modiolus modiolus beds with hydroids and red seaweeds on tide-swept circalittoral mixed substrata

Description (English)

Modiolus beds on mixed substrata (cobbles, pebbles and coarse muddy sediments) in moderately strong currents or wave exposed areas, typically on the open coast but also in tide-swept channels of marine inlets. Ophiothrix fragilis are often common in this biotope along with the calcareous tubes of Pomatoceros triqueter, anemones such as Alcyonium digitatum and Urticina felina and hydroids such as Abietinaria abietina and Sertularia argentea. Buccinum undatum may also be important and in some areas the clam Chlamys varia may be frequent but not in the same abundances as in unit A5.624. Little information on the infaunal component is given here although it is likely that it is very rich and may highlight more subtle differences in the Modiolus biotopes. This biotope is typified by examples off the north-west Lleyn Peninsula in N Wales and off Co. Down, Northern Ireland.

Source: EUNIS habitat classification

Quick facts

EUNIS habitat type code A5.621
Bern Convention Included in a Resolution 4 habitat type at a higher level (A5)

Vegetation types

Relation to vegetation types (syntaxa)

Not available

Species mentioned in habitat description

Invertebrates Abietinaria abietina
Invertebrates Alcyonium digitatum
Invertebrates Buccinum undatum
Invertebrates Chlamys varia
Invertebrates Ophiothrix fragilis
Invertebrates Pomatoceros triqueter
Invertebrates Sertularia argentea
Invertebrates Urticina felina
Species scientific name English common name Species group
Abietinaria abietina Invertebrates
Alcyonium digitatum Invertebrates
Buccinum undatum Invertebrates
Chlamys varia Invertebrates
Ophiothrix fragilis Invertebrates
Pomatoceros triqueter Invertebrates
Sertularia argentea Invertebrates
Urticina felina Invertebrates

Other classifications

Classification Code Habitat type name Relationship type
Marine Habitat Classification Britain/Ireland 0405 SS.SBR.SMus.ModT <I>Modiolus modiolus</I> beds with hydroids and red seaweeds on tide-swept circalittoral mixed substrata source
CORINE Land Cover 5.2.3. Sea and ocean n/a
Biodiversity Action Plan Priority Habitats (UK) 38 Modiolus modiolus beds wider
For relation to plant communities (syntaxa), see Vegetation types

History

Classification Code Habitat type name Relationship type
EUNIS Habitat Classification 200410 A5.621 Modiolus modiolus beds with hydroids and red seaweeds on tide-swept circalittoral mixed substrata same
EUNIS Habitat Classification 200308 A3.643 Modiolus modiolus beds with hydroids and red seaweeds on tide-swept circalittoral mixed substrata same
EUNIS Habitat Classification 200202 A3.643 Modiolus modiolus beds with hydroids and red seaweeds on tide-swept circalittoral mixed substrata same
EUNIS Habitat Classification 199910 A3.643 Modiolus modiolus beds with hydroids and red seaweeds on tide-swept circalittoral mixed substrata same
MNCR BioMar 97.06 (Britain & Ireland) MCR.M.ModT Modiolus modiolus beds with hydroids and red seaweeds on tide-swept circalittoral mixed substrata same
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