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 > MC2233 - Modiolus modiolus beds with fine hydroids and large solitary ascidians on very sheltered Atlantic circalittoral mixed substrata

Modiolus modiolus beds with fine hydroids and large solitary ascidians on very sheltered Atlantic circalittoral mixed substrata

Description (English)

Beds or scattered clumps of Modiolus modiolus in generally sheltered conditions with only slight tidal movement. Typically occurs in sealochs and the Shetland voes. Brittlestars Ophiothrix fragilis and Ophiocomina nigra, as well as Ophiopholis aculeata are often frequent, sometimes forming a dense bed as described in MC4-215. The queen scallop Aequipecten opercularis is often present in moderate abundances. Large solitary ascidians (Ascidiella aspersa, Corella parallelogramma, Dendrodoa grossularia) and fine hydroids (Kirchenpaueria pinnata) are present attached to the mussel shells. Decapods such as hermit crabs (Pagurus bernhardus) and spider crabs (Hyas araneus) are typically present. Coralline algal crusts may be found on the mussel shells, with some red seaweeds in shallower water such as Phycodrys rubens. 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.

Source: EUNIS habitat classification

Quick facts

EUNIS habitat type code MC2233
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

Algae Phycodrys rubens
Invertebrates Aequipecten opercularis
Invertebrates Ascidiella aspersa
Invertebrates Corella parallelogramma
Invertebrates Dendrodoa grossularia
Invertebrates Hyas araneus
Invertebrates Kirchenpaueria pinnata
Invertebrates Modiolus modiolus
Invertebrates Ophiocomina nigra
Invertebrates Ophiopholis aculeata
Invertebrates Ophiothrix fragilis
Invertebrates Pagurus bernhardus
Species scientific name English common name Species group
Phycodrys rubens Algae
Aequipecten opercularis Invertebrates
Ascidiella aspersa Invertebrates
Corella parallelogramma Invertebrates
Dendrodoa grossularia Invertebrates
Hyas araneus Invertebrates
Kirchenpaueria pinnata Invertebrates
Modiolus modiolus Invertebrates
Ophiocomina nigra Invertebrates
Ophiopholis aculeata Invertebrates
Ophiothrix fragilis Invertebrates
Pagurus bernhardus Invertebrates

Other classifications

History

Classification Code Habitat type name Relationship type Comment
EUNIS Habitat Classification 200410 A5.623 Modiolus modiolus beds with fine hydroids and large solitary ascidians on very sheltered circalittoral mixed substrata same
EUNIS Habitat Classification 200308 A3.722 Modiolus modiolus beds with fine hydroids and large solitary ascidians on very sheltered circalittoral mixed substrata same
EUNIS Habitat Classification 200202 A3.722 Modiolus modiolus beds with fine hydroids and large solitary ascidians on very sheltered circalittoral mixed substrata same
EUNIS Habitat Classification 199910 A3.722 Modiolus modiolus beds with fine hydroids and large solitary ascidians on very sheltered circalittoral mixed substrata same
MNCR BioMar 97.06 (Britain & Ireland) SCR.Mod.ModHAs Modiolus modiolus beds with fine hydroids and large solitary ascidians on very sheltered circalittoral mixed substrata same
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