EUNIS habitat classification 2017 > M - Marine benthic habitats > MB1 - Infralittoral rock > MB12 - Atlantic infralittoral rock > MB121 - Kelp and seaweed communities on Atlantic infralittoral rock > MB121D - Hiatella arctica and seaweeds on vertical Atlantic littoral limestone / chalk

Hiatella arctica and seaweeds on vertical Atlantic littoral limestone / chalk

Description (English)

This biotope is found in the infralittoral zone on moderately exposed vertical limestone/chalk surfaces in weak tidal streams, and has been recorded most frequently between 0-10m. This biotope is characterised by abundant Hiatella arctica and a rich sponge community including Cliona celata, Dysidea fragilis and Pachymatisma johnstonia. Other species that may be frequent in this biotope are the crab Necora puber, the sea squirt Clavelina lepadiformis, and the top shell Calliostoma zizyphinum, although these species are found in other vertical rock biotopes, however in lesser abundance.
Situation: Shallow rocky coasts with vertical limestone faces.

Source: EUNIS habitat classification

Quick facts

EUNIS habitat type code MB121D
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 Calliostoma zizyphinum
Invertebrates Clavelina lepadiformis
Invertebrates Cliona celata
Invertebrates Dysidea fragilis
Invertebrates Hiatella arctica
Invertebrates Necora puber
Invertebrates Pachymatisma johnstonia
Species scientific name English common name Species group
Calliostoma zizyphinum Invertebrates
Clavelina lepadiformis Invertebrates
Cliona celata Invertebrates
Dysidea fragilis Invertebrates
Hiatella arctica Invertebrates
Necora puber Invertebrates
Pachymatisma johnstonia Invertebrates

Other classifications

Classification Code Habitat type name Relationship type
EUNIS Habitat Classification 2007 (revised descriptions 2012) A3.217 Hiatella arctica and seaweeds on vertical limestone / chalk same
For relation to plant communities (syntaxa), see Vegetation types

History

Classification Code Habitat type name Relationship type Comment
EUNIS Habitat Classification 200410 A3.218 Hiatella arctica and seaweeds on vertical limestone / chalk same
EUNIS Habitat Classification 200308 A3.2411 Hiatella arctica, bryozoans and ascidians on vertical infralittoral soft rock overlap
EUNIS Habitat Classification 200202 A3.2411 Hiatella arctica, bryozoans and ascidians on vertical infralittoral soft rock overlap
EUNIS Habitat Classification 199910 A3.2411 Hiatella arctica, bryozoans and ascidians on vertical infralittoral soft rock overlap
MNCR BioMar 97.06 (Britain & Ireland) IR.FaSwV.AlcByH.Hia Hiatella arctica, bryozoans and ascidians on vertical infralittoral soft rock overlap
European Environment Agency (EEA)
Kongens Nytorv 6
1050 Copenhagen K
Denmark
Phone: +45 3336 7100