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Deep, offshore habitats with cohesive sandy mud (>20% mud) may support communities characterised by infaunal polychaetes and the bivalve Myrtea spinifera. Polychaetes typically include Chaetozone setosa, Paramphinome jeffreysii, Levinsenia gracilis, Aricidea (Acmira) catherinae, and Prionospio malmgreni. The bivalves Thyasira spp. and Abra nitida may also be found as may seapens, such as Pennatula phosphorea. Some examples of the biotope SS.SMu.CSaMu.AfilEten contain Myrtea spinifera (Mackie 1990) in lower numbers but these habitats are generally sandier than those in SS.SMu.OMu.MyrPo.