EUNIS habitat classification 2012 amended 2019 > A - Marine habitats > A5 - Sublittoral sediment > A5.4 - Sublittoral mixed sediments > A5.44 - Circalittoral mixed sediments > A5.443 - Mysella bidentata and Thyasira spp. in circalittoral muddy mixed sediment

Mysella bidentata and Thyasira spp. in circalittoral muddy mixed sediment

English name: Mysella bidentata and Thyasira spp. in circalittoral muddy mixed sediment

Description (English)

In moderately exposed or sheltered, circalittoral muddy sands and gravels a community characterised by the bivalves Thyasira spp. (often Thyasira flexuosa), Mysella bidentata and Prionospio fallax may develop. Infaunal polychaetes such as Lumbrineris gracilis, Chaetozone setosa and Scoloplos armiger are also common in this community whilst amphipods such as Ampelisca spp. and the cumacean Eudorella truncatula may also be found in some areas. The brittlestar Amphiura filiformis may also be abundant at some sites. Conspicuous epifauna may include encrusting bryozoans Escharella spp. particularly Escharella immersa and, in shallower waters, maerl (Phymatolithon calcareum), although at very low abundances and not forming maerl beds.

Source: EUNIS habitat classification

Quick facts

EUNIS habitat type code A5.443
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 Amphiura filiformis
Invertebrates Chaetozone setosa
Invertebrates Escharella immersa
Invertebrates Eudorella truncatula
Invertebrates Lumbrineris gracilis
Invertebrates Mysella bidentata
Algae Phymatolithon calcareum
Invertebrates Prionospio fallax
Invertebrates Scoloplos armiger
Invertebrates Thyasira flexuosa
Species scientific name English common name Species group
Amphiura filiformis Invertebrates
Chaetozone setosa Invertebrates
Escharella immersa Invertebrates
Eudorella truncatula Invertebrates
Lumbrineris gracilis Invertebrates
Mysella bidentata Invertebrates
Phymatolithon calcareum Algae
Prionospio fallax Invertebrates
Scoloplos armiger Invertebrates
Thyasira flexuosa Invertebrates

Other classifications

Classification Code Habitat type name Relationship type
Marine Habitat Classification Britain/Ireland 0405 SS.SMx.CMx.MysThyMx <I>Mysella bidentata</I> and <I>Thyasira</I> spp. in circalittoral muddy mixed sediment source
CORINE Land Cover 5.2.3. Sea and ocean n/a
For relation to plant communities (syntaxa), see Vegetation types

History

Classification Code Habitat type name Relationship type
EUNIS Habitat Classification 200410 A5.443 Mysella bidentata and Thyasira spp. in circalittoral muddy mixed sediment same
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