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Exposed and moderately exposed shores of fully marine mobile clean sand, with particle sizes ranging from coarse to very fine. The sediment is not always well sorted, and may contain a subsurface layer of gravel or shell debris. Usually no anoxic layer is present. The mobility of the sediment leads to a species-poor community, dominated by the polychaetes Scolelepis (Scolelepis) squamata and S. foliosa. The amphipod Bathyporeia pilosa may be present. Further species that may be present in this sub-biotope include the amphipods B. pelagica and Haustorius arenarius, and the isopod Eurydice pulchra. The lugworm Arenicola marina may also occur.