EUNIS habitat classification 2012 amended 2019 > A - Marine habitats > A5 - Sublittoral sediment > A5.2 - Sublittoral sand > A5.24 - Infralittoral muddy sand > A5.242 - Fabulina fabula and Magelona mirabilis with venerid bivalves and amphipods in infralittoral compacted fine muddy sand

Fabulina fabula and Magelona mirabilis with venerid bivalves and amphipods in infralittoral compacted fine muddy sand

English name: Fabulina fabula and Magelona mirabilis with venerid bivalves and amphipods in infralittoral compacted fine muddy sand

Quick facts

EUNIS habitat type code A5.242
Bern Convention Included in a Resolution 4 habitat type at a higher level (A5)

Description (English)

In stable, fine, compacted sands and slightly muddy sands in the infralittoral and littoral fringe, communities occur that are dominated by venerid bivalves such as Chamelea gallina. This biotope may be characterised by a prevalence of Fabulina fabula and Magelona mirabilis or other species of Magelona (e.g. M. filiformis). Other taxa, including the amphipod Bathyporeia spp. and polychaetes such as Chaetozone setosa, Spiophanes bombyx and Nephtys spp. are also commonly recorded. In some areas the bivalve Spisula elliptica may also occur in this biotope in low numbers. The community is relatively stable in its species composition, however, numbers of Magelona and F. Fabulina tend to fluctuate. Around the Scilly Isles numbers of F. fabulina in this biotope are uncommonly low whilst these taxa are often found in higher abundances in muddier communities (presumably due to the higher organic content). Consequently it may be better to revise this biotope on the basis of less ubiquitous taxa such as key amphipod species (E.I.S. Rees pers. comm. 2002) although more data is required to test this. A5.242 and A5.133 are collectively considered to be the 'shallow Venus community' or 'boreal off-shore sand association' of previous workers (see Petersen 1918; Jones 1950; Thorson 1957). These communities have been shown to correlate well with particular levels of current induced 'bed-stress' (Warwick & Uncles 1980). The 'Arctic Venus Community' and 'Mediterranean Venus Community' described to the north and south of the UK (Thorson 1957) probably occur in the same habitat and appears to be the same biotope described as the Ophelia borealis community in northern France and the central North Sea (Künitzer et al. 1992). Sites with this biotope may undergo transitions in community composition. The epibiotic biotopes A5.241 and A5.243 may also overlay this biotope in some areas.

Source: EUNIS habitat classification

Vegetation types

Relation to vegetation types (syntaxa)

Not available

Species mentioned in habitat description

Invertebrates Chaetozone setosa
Invertebrates Chamelea gallina
Invertebrates Magelona mirabilis
Invertebrates Ophelia borealis
Invertebrates Spiophanes bombyx
Invertebrates Spisula elliptica
Species scientific name English common name Species group
Chaetozone setosa Invertebrates
Chamelea gallina Invertebrates
Magelona mirabilis Invertebrates
Ophelia borealis Invertebrates
Spiophanes bombyx Invertebrates
Spisula elliptica Invertebrates

Other classifications

Classification Code Habitat type name Relationship type
Marine Habitat Classification Britain/Ireland 0405 SS.SSa.IMuSa.FfabMag <I>Fabulina fabula</I> and <I>Magelona mirabilis</I> with venerid bivalves and amphipods in infralittoral compacted fine muddy sand 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 A5.242 Fabulina fabula and Magelona mirabilis with venerid bivalves and amphipods in infralittoral compacted fine muddy sand same
EUNIS Habitat Classification 200308 A5.242 Spio filicornis and Spiophanes bombyx infralittoral clean or muddy sand overlap
EUNIS Habitat Classification 200308 A4.212 Fabulina fabula and Magelona mirabilis with venerid bivalves and amphipods in infralittoral compacted fine muddy sand same
EUNIS Habitat Classification 200202 A4.252 Spio filicornis and Spiophanes bombyx infralittoral clean or muddy sand narrower
EUNIS Habitat Classification 200202 A4.212 Fabulina fabula and Magelona mirabilis with venerid bivalves in shallow-water compacted fine sand narrower
EUNIS Habitat Classification 199910 A4.212 Fabulina fabula and Magelona mirabilis with venerid bivalves in shallow-water compacted fine sand narrower
EUNIS Habitat Classification 199910 A4.262 Spio filicornis and Spiophanes bombyx infralittoral clean or muddy sand narrower
MNCR BioMar 97.06 (Britain & Ireland) IGS.FaS.FabMag Fabulina fabula and Magelona mirabilis with venerid bivalves in infralittoral compacted fine sand narrower
MNCR BioMar 97.06 (Britain & Ireland) IMS.FaMS.SpiSpi Spio filicornis and Spiophanes bombyx infralittoral clean or muddy sand narrower
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