EUNIS habitat classification 2012 amended 2019 > A - Marine habitats > A4 - Circalittoral rock and other hard substrata > A4.1 - Atlantic and Mediterranean high energy circalittoral rock > A4.13 - Mixed faunal turf communities on circalittoral rock > A4.137 - Flustra foliacea and Haliclona oculata with a rich faunal turf on tide-swept circalittoral mixed substrata

Flustra foliacea and Haliclona oculata with a rich faunal turf on tide-swept circalittoral mixed substrata

English name: Flustra foliacea and Haliclona oculata with a rich faunal turf on tide-swept circalittoral mixed substrata

Description (English)

This biotope is typically found on exposed slopes of silty cobble and pebble subject to strong to moderate tidal streams. From afar, large 'finger' growths of the sponge Haliclona oculata occur amongst a rich faunal turf of hydroids and bryozoans with Flustra foliacea prominent. The dense faunal turf growing on the cobbles is composed of the bryozoans F. foliacea, Alcyonidium diaphanum and Crisia eburnea and sporadic occurrences of the hydroids Nemertesia antennina, Hydrallmania falcata, Tubularia larynx, Rhizocaulus verticillatus and Halecium halecinum. Caprellid shrimps may be observed within this faunal turf. The hard substratum frequently has a dense covering of the sponge H. oculata and occasionally Esperiopsis fucorum, while the softer gravely/sand between the cobbles provides a habitat for anemones such as Urticina felina and Cerianthus lloydii. The nudibranch Janolus cristatus may be seen preying on the faunal turf and the fan worm Sabella pavonia is occasionally seen amongst the cobbles. The soft coral Alcyonium digitatum is often attached to the upper faces of more stable cobbles and rocks, while in the crevices between cobbles, the anemone Sagartia elegans, the crab Cancer pagurus, the prawn Pandalus montagui and the amphipod Dyopedos porrectus may be observed. Under-cobble fauna includes terebellid worms and Harmothoe spp. This biotope has been recorded from the Menai Strait, Milford Haven and Morecambe Bay.

Source: EUNIS habitat classification

Quick facts

EUNIS habitat type code A4.137
Bern Convention Included in a Resolution 4 habitat type at a higher level (A4)

Vegetation types

Relation to vegetation types (syntaxa)

Not available

Species mentioned in habitat description

Invertebrates Alcyonidium diaphanum
Invertebrates Alcyonium digitatum
Invertebrates Cancer pagurus
Invertebrates Crisia eburnea
Invertebrates Dyopedos porrectus
Invertebrates Esperiopsis fucorum
Invertebrates Flustra foliacea
Invertebrates Haliclona oculata
Invertebrates Hydrallmania falcata
Invertebrates Janolus cristatus
Invertebrates Nemertesia antennina
Invertebrates Pandalus montagui
Invertebrates Rhizocaulus verticillatus
Invertebrates Sagartia elegans
Invertebrates Tubularia larynx
Invertebrates Urticina felina
Species scientific name English common name Species group
Alcyonidium diaphanum Invertebrates
Alcyonium digitatum Invertebrates
Cancer pagurus Invertebrates
Crisia eburnea Invertebrates
Dyopedos porrectus Invertebrates
Esperiopsis fucorum Invertebrates
Flustra foliacea Invertebrates
Haliclona oculata Invertebrates
Hydrallmania falcata Invertebrates
Janolus cristatus Invertebrates
Nemertesia antennina Invertebrates
Pandalus montagui Invertebrates
Rhizocaulus verticillatus Invertebrates
Sagartia elegans Invertebrates
Tubularia larynx Invertebrates
Urticina felina Invertebrates

Other classifications

Classification Code Habitat type name Relationship type
Marine Habitat Classification Britain/Ireland 0405 CR.HCR.XFa.FluHocu <I>Flustra foliacea</I> and <I>Haliclona oculata</I> with a rich faunal turf on tide-swept circalittoral mixed substrata 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 A4.137 Flustra foliacea and Haliclona oculata with a rich faunal turf on tide-swept circalittoral mixed substrata same
EUNIS Habitat Classification 200308 A3.6224 Flustra foliacea and Haliclona oculata with a rich faunal turf on tide-swept circalittoral mixed substrata same
EUNIS Habitat Classification 200202 A3.6224 Haliclona oculata and Flustra foliacea with a rich faunal turf on tide-swept sheltered circalittoral boulders and cobbles same
EUNIS Habitat Classification 199910 A3.6224 Haliclona oculata and Flustra foliacea with a rich faunal turf on tide-swept sheltered circalittoral boulders and cobbles same
MNCR BioMar 97.06 (Britain & Ireland) MCR.ByH.Flu.Hocu Haliclona oculata and Flustra foliacea with a rich faunal turf on tide-swept sheltered circalittoral boulders and cobbles same
European Environment Agency (EEA)
Kongens Nytorv 6
1050 Copenhagen K
Denmark
Phone: +45 3336 7100