EUNIS habitat classification 2017 > M - Marine benthic habitats > MB4 - infralittoral mixed sediment > MB42 - Atlantic infralittoral mixed sediment > MB421 - Maerl beds on Atlantic infralittoral mixed sediment > MB4211 - Lithothamnion corallioides maerl beds on Atlantic infralittoral muddy gravel

Lithothamnion corallioides maerl beds on Atlantic infralittoral muddy gravel

Description (English)

Live maerl beds in sheltered, silty conditions which are dominated by Lithothamnion corallioides with a variety of foliose and filamentous seaweeds. Live maerl is at least common but there may be noticeable amounts of dead maerl gravel and pebbles. Other species of maerl, such as Phymatolithon calcareum and Phymatolithon purpureum, may also occur as a less abundant component. Species of seaweed such as Dictyota dichotoma, Halarachnion ligulatum. and Ulva spp. are often present, although are not restricted to this biotope, whereas Dudresnaya verticillata tends not to occur on other types of maerl beds. The anemones Anemonia viridis and Cerianthus lloydii, the polychaetes Notomastus latericeus and Caulleriella alata, the isopod Janira maculosa and the bivalve Hiatella arctica are typically found in MB4-211 where as Echinus esculentus tends to occur more in other types of maerl. The seaweeds Laminaria saccharina and Chorda filum may also be present in some habitats. MB4-211 has a south-western distribution in Britain and Ireland. Sheltered, stable, fully saline maerl beds in the north of Great Britain (where L. corallioides has not been confirmed to occur) may need to be described as an analogous biotope to MB4-211 (see MB3-221).

Source: EUNIS habitat classification

Quick facts

EUNIS habitat type code MB4211
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 Dictyota dichotoma
Algae Dudresnaya verticillata
Algae Halarachnion ligulatum
Algae Laminaria saccharina
Algae Phymatolithon calcareum
Algae Phymatolithon purpureum
Invertebrates Anemonia viridis
Invertebrates Caulleriella alata
Invertebrates Echinus esculentus
Invertebrates Hiatella arctica
Invertebrates Janira maculosa
Invertebrates Notomastus latericeus
Species scientific name English common name Species group
Dictyota dichotoma Algae
Dudresnaya verticillata Algae
Halarachnion ligulatum Algae
Laminaria saccharina Algae
Phymatolithon calcareum Algae
Phymatolithon purpureum Algae
Anemonia viridis Invertebrates
Caulleriella alata Invertebrates
Echinus esculentus Invertebrates
Hiatella arctica Invertebrates
Janira maculosa Invertebrates
Notomastus latericeus Invertebrates

Other classifications

Classification Code Habitat type name Relationship type
EUNIS Habitat Classification 2007 (revised descriptions 2012) A5.513 Lithothamnion corallioides maerl beds on infralittoral muddy gravel narrower
For relation to plant communities (syntaxa), see Vegetation types

History

Classification Code Habitat type name Relationship type Comment
EUNIS Habitat Classification 200410 A5.513 Lithothamnion corallioides maerl beds on infralittoral muddy gravel same
EUNIS Habitat Classification 200308 A4.651 Maerl facies (Lithothamnion corallioides and Phymatolithon calcareum) overlap
EUNIS Habitat Classification 200308 A4.613 Maerl facies (= Association with Lithothamnion corallioides and Phymatolithon calcareum) overlap
EUNIS Habitat Classification 200308 A4.621 Lithothamnion corallioides maerl beds on infralittoral muddy gravel same
EUNIS Habitat Classification 200202 A4.651 Maerl facies (Lithothamnion corallioides and Phymatolithon calcareum) narrower
EUNIS Habitat Classification 200202 A4.613 Ma narrower
EUNIS Habitat Classification 200202 A4.621 Lithothamnion coralloides maerl beds on shallow-water muddy gravel narrower
EUNIS Habitat Classification 199910 A4.4A2 Maerl facies (Lithothamnion corallioides and Phymatholithon calcareum) narrower
EUNIS Habitat Classification 199910 A4.113 Ma narrower
EUNIS Habitat Classification 199910 A4.421 Lithothamnion coralloides maerl beds on shallow-water muddy gravel narrower
MNCR BioMar 97.06 (Britain & Ireland) IMX.MrlMX.Lcor Lithothamnion coralloides maerl beds on infralittoral muddy gravel same
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