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SS.SMu.CSaMu.ThyNten
Thyasira spp. and Nuculoma tenuis in circalittoral sandy mud

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Habitat (physical) description

Distribution

 Salinity: Full (30-35 ppt) 
 Wave exposure: Moderately exposed, Sheltered 
 Tidal streams: Very weak (negligible) 
 Substratum: Mud occasionally with scattered shells or gravel 
 Zone: Circalittoral 
 Depth Band: 20-30 m, 30-50 m, 50-100 m 
 Other Features:  

Download comparative physical and biological data. The comparative tables enable a rapid comparison of the species composition and principal physical characteristics between a given set of biotopes.
Distribution of habitat SS.SMu.CSaMu.ThyNten  Thyasira spp. and Nuculoma tenuis in circalittoral sandy mud
Distribution of habitat SS.SMu.CSaMu.ThyNten Thyasira spp. and Nuculoma tenuis in circalittoral sandy mud, based on records on the UK Marine Recorder database and EUSeaMap. Red dots represent records on which the biotope is based. Blue dots show other certain records, black dots show records tentatively assigned to this biotope. Yellow areas show level 2 and 3 sublittoral and deep-sea habitats prediced by EUSeaMap within UK waters.

Biotope description

Circalittoral cohesive sandy muds with small quantities of gravel, off sheltered or moderately exposed coasts may support populations characterised by Thyasira spp. and in particular Thyasira flexuosa. Other characteristic taxa may include Nuculoma tenuis, Goniada maculate and in some areas Rhodine gracilior. Mysella bidentata, Abra alba, Harpinia antennaria and Amphiura filiformis may be abundant in some examples of this biotope. Whilst moderately diverse, animal abundances are often low and it is possible that the biotope is the result of sedimentary disturbance e.g. from trawling and is possibly an impoverished version of AfilNten. Collectively the biotopes ThyNten, AfilMysAnit, AfilNten and OfusAfil, may form the Amphiura dominated components of the 'off-shore muddy sand association' described by other workers (Jones 1951; Thorson 1957; Mackie 1990) and the infralittoral etage described by Glemarec (1973).

Situation

No situation data available.

Temporal variation

No temporal data available.

Similar biotopes

SS.SMu.CSaMu.AfilNtenThe current biotope may be distinguished from AfilNten by the differing abundances of the characterising species Amphiura filiformis and Thyasira flexuosa in the two biotopes.

Characterising Species

Taxa Frequency Typical Abundance % Contribution to similarity Abundance (no.2)
Virgularia mirabilis P 1 5
Nemertea P 7 30
Pholoe inornata P 1 24
Glycera rouxii P 2 6
Goniada maculata P 5 10
Nephtys P 2 8
Lumbrineris hibernica P 3 12
Paraonidae P 2 6
Spiophanes bombyx P 1 8
Spiophanes kroyeri P 1 4
Chaetozone setosa P 2 8
Diplocirrus glaucus P 2 10
Rhodine gracilior C 4 20
Scalibregma inflatum C 1 91
Galathowenia oculata P 3 11
Owenia fusiformis C 2 9
Anobothrus gracilis P 1 5
Terebellides stroemi P 3 8
Harpinia antennaria F 3 16
Cylichna cylindracea P 2 7
Nuculoma tenuis F 4 14
Lucinoma borealis P 2 4
Thyasira C 1 80
Thyasira flexuosa O 50
Thyasira flexuosa F 12 65
Mysella bidentata F 3 31
Phaxas pellucidus P 1 6
Abra alba P 3 12
Abra alba P 25
Mya arenaria P 25
Amphiura filiformis A 3 15

Example photographs of biotope

No characteristic photos currently available. If you are able to provide a photograph of this biotope please contact .


Version 15.03 of the classification adds a deep-sea section to version 04.05; therefore superseding version 04.05, 97.06 and 03.02.

This online classification should be cited as:

JNCC (2015) The Marine Habitat Classification for Britain and Ireland Version 15.03 [Online]. [Date accessed]. Available from: jncc.defra.gov.uk/MarineHabitatClassification

Information from the shallower section (up to sublittoral sediment, taken from Version 04.05) be cited as the report accompanying Version 04.05, as follows:

CONNOR, D.W., J.H. ALLEN, N.GOLDING, K.L.HOWELL, L.M. LIEBERKNECHT, K.O. NORTHEN AND J.B. REKER (2004) The Marine Habitat Classification for Britain and Ireland Version 04.05. In: JNCC (2015) The Marine Habitat Classification for Britain and Ireland Version 15.03 [Online]. [Date accessed].
Available from: jncc.defra.gov.uk/MarineHabitatClassification
ISBN 1 861 07561 8


Information from the deep-sea section (added in March 2015) should be cited as the report accompanying the deep-sea section, as follows:

PARRY, M.E.V., K.L. HOWELL, B.E. NARAYANASWAMY, B.J. BETT, D.O.B. JONES, D.J. HUGHES, N. PIECHAUD, T.D. NICKELL, H. ELLWOOD, N. ASKEW, C. JENKINS and E. MANCA (2015) A Deep-sea Section for the Marine Habitat Classification of Britain and Ireland. JNCC report 530. In: JNCC (2015) The Marine Habitat Classification for Britain and Ireland Version 15.03 [Online]. [Date accessed].
Available from: jncc.defra.gov.uk/MarineHabitatClassification
ISSN 0963 8901