EUNIS habitat classification 2017 > M - Marine benthic habitats > MB4 - infralittoral mixed sediment > MB42 - Atlantic infralittoral mixed sediment > MB424 - Faunal communities on variable salinity Atlantic infralittoral mixed sediment > MB4242 - Crepidula fornicata and Mediomastus fragilis in variable salinity Atlantic infralittoral mixed sediment

Crepidula fornicata and Mediomastus fragilis in variable salinity Atlantic infralittoral mixed sediment

Description (English)

Variable salinity mixed sediment characterised by the slipper limpet Crepidula fornicata and the polychaetes Mediomastus fragilis and Aphelochaeta marioni. Other numerically important taxa include the oligochaetes Tubificoides benedii, syllids such as Exogone naidina and Sphaerosyllis, and Nephtys hombergii. Lepidonotus squamatus and Scoloplos armiger may also be common. Shell debris and cobbles are colonised by the ascidians Ascidiella aspersa, Ascidiella scabra, Molgula sp. and Dendrodoa grossularia (the ascidians may not be recorded adequately by remote infaunal survey techniques).
Situation: This biotope occurs in the lower estuary where currents allow a stable environment to develop. It is associated with oyster beds and relict oyster beds, (MB2-222) in southern England and Wales. It may be found adjacent to or in conjunction with MB6-252 and MB4-241. It may be associated with MB4-233 and possibly form a component of MB6-242.

Source: EUNIS habitat classification

Quick facts

EUNIS habitat type code MB4242
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 Aphelochaeta marioni
Invertebrates Ascidiella aspersa
Invertebrates Ascidiella scabra
Invertebrates Crepidula fornicata
Invertebrates Dendrodoa grossularia
Invertebrates Lepidonotus squamatus
Invertebrates Mediomastus fragilis
Invertebrates Nephtys hombergii
Invertebrates Scoloplos armiger
Invertebrates Tubificoides benedii
Species scientific name English common name Species group
Aphelochaeta marioni Invertebrates
Ascidiella aspersa Invertebrates
Ascidiella scabra Invertebrates
Crepidula fornicata Invertebrates
Dendrodoa grossularia Invertebrates
Lepidonotus squamatus Invertebrates
Mediomastus fragilis Invertebrates
Nephtys hombergii Invertebrates
Scoloplos armiger Invertebrates
Tubificoides benedii Invertebrates

Other classifications

Classification Code Habitat type name Relationship type
EUNIS Habitat Classification 2007 (revised descriptions 2012) A5.422 Crepidula fornicata and Mediomastus fragilis in variable salinity infralittoral 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 A5.422 Crepidula fornicata and Mediomastus fragilis in variable salinity infralittoral mixed sediment same
EUNIS Habitat Classification 200202 A4.431 Crepidula fornicata and Aphelochaeta marioni in variable salinity shallow-water mixed sediment same
EUNIS Habitat Classification 199910 A4.451 Crepidula fornicata and Aphelochaeta marioni in variable salinity shallow-water mixed sediment same
MNCR BioMar 97.06 (Britain & Ireland) IMX.EstMx.CreAph Crepidula fornicata and Aphelochaeta marioni in variable salinity infralittoral mixed sediment same
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