EUNIS habitat classification 2017 > M - Marine benthic habitats > MC4 - Circalittoral mixed sediment > MC42 - Atlantic circalittoral mixed sediment > MC421 - Faunal communities of Atlantic circalittoral mixed sediment > MC4214 - Flustra foliacea and Hydrallmania falcataon tide-swept circalittoral mixed sediment

Flustra foliacea and Hydrallmania falcataon tide-swept circalittoral mixed sediment

Description (English)

This biotope represents part of a transition between sand-scoured circalittoral rock where the epifauna is conspicuous enough to be considered as a biotope and a sediment biotope where an infaunal sample is required to characterise it and is possibly best considered an epibiotic overlay. Flustra foliacea and the hydroid Hydrallmania falcata characterise this biotope; lesser amounts of other hydroids such as Sertularia argentea, Nemertesia antennina and occasionally Nemertesia ramose, occur where suitably stable hard substrata is found. The anemone Urticina feline and the soft coral Alcyonium digitatum may also characterise this biotope. Barnacles Balanus crenatus and tube worms Pomatoceros triqueter may be present and the robust bryozoans Alcyonidium diaphanum and Vesicularia spinosa appear amongst the hydroids at a few sites. Sabella pavonina and Lanice conchilega may be occasionally found in the coarse sediment around the stones. In shallower (i.e. upper circalittoral) examples of this biotope scour-tolerant robust red algae such as Polysiphonia nigrescens, Calliblepharis spp. and Gracilaria gracilis are found.
Situation: This biotope is found around most coasts, although regional differences are seen where one or two similarly scour-tolerant species such as Styela clava and Crepidula fornicata (Solent) occupy the hard substrata

Source: EUNIS habitat classification

Quick facts

EUNIS habitat type code MC4214
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

Invertebrates Alcyonidium diaphanum
Invertebrates Alcyonium digitatum
Invertebrates Flustra foliacea
Invertebrates Hydrallmania falcata
Invertebrates Lanice conchilega
Invertebrates Nemertesia antennina
Invertebrates Pomatoceros triqueter
Invertebrates Sabella pavonina
Invertebrates Sertularia argentea
Invertebrates Vesicularia spinosa
Species scientific name English common name Species group
Alcyonidium diaphanum Invertebrates
Alcyonium digitatum Invertebrates
Flustra foliacea Invertebrates
Hydrallmania falcata Invertebrates
Lanice conchilega Invertebrates
Nemertesia antennina Invertebrates
Pomatoceros triqueter Invertebrates
Sabella pavonina Invertebrates
Sertularia argentea Invertebrates
Vesicularia spinosa Invertebrates

Other classifications

Classification Code Habitat type name Relationship type
EUNIS Habitat Classification 2007 (revised descriptions 2012) A5.444 Flustra foliacea and Hydrallmania falcata on tide-swept circalittoral mixed sediment same
For relation to plant communities (syntaxa), see Vegetation types

History

Classification Code Habitat type name Relationship type Comment
EUNIS Habitat Classification 200410 A5.444 Flustra foliacea and Hydrallmania falcata on tide-swept circalittoral mixed sediment same
EUNIS Habitat Classification 200308 A4.133 Sertularia argentea, Sertularia cupressina and Hydrallmania falcata on tide-swept circalittoral cobbles and pebbles narrower
EUNIS Habitat Classification 200308 A3.621 Sparse sponges, Nemertesia spp., Alcyonidium diaphanum and Bowerbankia spp. on circalittoral mixed substrata narrower
EUNIS Habitat Classification 200202 A4.133 Sertularia argentea, Sertularia cupressina and Hydrallmania falcata on tide-swept circalittoral cobbles and pebbles narrower
EUNIS Habitat Classification 200202 A3.621 Sparse sponges, Nemertesia spp., Alcyonidium diaphanum and Bowerbankia spp. on circalittoral mixed substrata narrower
EUNIS Habitat Classification 199910 A3.621 Sparse sponges, Nemertesia spp., Alcyonidium diaphanum and Bowerbankia spp. on circalittoral mixed substrata narrower
EUNIS Habitat Classification 199910 A4.143 Sertularia argentea, Sertularia cupressina and Hydrallmania falcata on tide-swept circalittoral cobbles and pebbles narrower
MNCR BioMar 97.06 (Britain & Ireland) MCR.ByH.SNemAdia Sparse sponges, Nemertesia spp., Alcyonidium diaphanum and Bowerbankia spp. on circalittoral mixed substrata narrower
MNCR BioMar 97.06 (Britain & Ireland) MCR.ByH.Flu.SerHyd Sertularia argentea, Sertularia cupressina and Hydrallmania falcata on tide-swept circalittoral cobbles and pebbles narrower
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