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In deep offshore sandy mud adjacent to oil or gas platforms, organic enrichment from drill cuttings leads to the development of communities dominated by the pollution tolerant opportunist Capitella capitata and the polychaete Ophryotrocha dubia (or other species of Ophryotrocha). These species are generally found in extremely high abundances and accompanied by Thyasira spp., Raricirrus beryli, Paramphinome jeffreysii and Chaetozone setosa. Other taxa including Exogone verugera, Pholoe inornata and Idasola simpsoni may also be present.