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Dense aggregations of Ocnus planci on various substrata, typically muddy but occasionally with stones or shells, in sheltered conditions such as sea lochs. Philine aperta also characterises this biotope but is present in lower abundances than in SS.SMu.IFiMu.PhiVir. Other associated species vary but are typical of very sheltered muddy habitats and include the ophiuroids Ophiura spp. and Ophiothrix fragilis. Melanella alba, which parasitises holothurians, has been found in large numbers at one site.