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Shallow, typically anoxic, muddy and sandy mud sediments in areas of low or reduced, although stable, salinity (may vary annually) with largely ephemeral faunal communities. Characterised by Arenicola marina and blue-green algae with other species which commonly occur in lagoons, including Corophium spp. and Chironomid larvae. Important infaunal species may include polychaetes Hediste diversicolor, and oligochaetes Baltidrilus costatus and Tubificoides spp. Other species found include mysids and Carcinus maenas.

Shallow sand and muddy sand in areas of low or reduced, although relatively stable salinity (may vary annually), with largely ephemeral faunal communities. The species are often similar to that found in SS.SMu.SMuLS and are characterised by Arenicola marina with other species, including mysids, tubificoid and enchytraeid oligochaetes, Corophium volutator, Hediste diversicolor, Pygospio elegans, Peringia ulvae and Cerastoderma glaucum, which commonly occur in lagoons. Filamentous green algae such as Chaetomorpha linum may also be present. In some examples of this biotope the polychaete Fabricia stellaris may be super-abundant and the isopod Lekanesphaera hookeri common.