Sparse Modiolus modiolus, dense Cerianthus lloydii and burrowing holothurians on sheltered circalittoral stones and mixed sediment
|Within Vocab||Marine Habitat Classification for Britain and Ireland Version 97.06|
|Definition||Pebbles and cobbles on muddy shell gravel in sealochs with dense Cerianthus lloydii and sparse Modiolus modiolus. Large burrowing holothurians (many only extend their tentacles above the sediment surface seasonally) include Psolus phantapus, Paracucumaria hyndmani, Thyonidium commune, Thyone fusus and Leptopentacta elongata. This biotope is well developed in the Clyde sealochs, although many examples are rather species-poor. Some examples in south-west Scotland sealochs have greater quantities of boulders and cobbles and therefore have a richer associated biota (compared with other sheltered Modiolus bed biotopes such as SCR.ModHAs). Examples in Shetland are somewhat different in having the cucumber Cucumaria frondosa amongst sparse Modiolus beds and a slightly different balance in abundance of other species; for example the brittlestar Ophiopholis aculeata is more abundant in these far northern examples in the voes and narrows (see MCR.Oph.Oacu).|
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