Cerastoderma glaucum

Locally common living in muddy sand and muddy gravel, occasionally peat and amongst pebbles, at or just below the surface, typically in brackish lagoons and very enclosed bays from mid tide to just below low water. More resistant of reduced of reduced salinity than C. edule, and resistant to hypersaline conditions, and extremes of temperature. Also more usually permanently submerged rather than maintaining moisture in damp sand when the tide is out. Generally not as dense in a bed and probably less fecund. May occur with C. edule but usually separate even in the same locality, occupying the more lagoonal sites. Fewer damaged shells found, indicating either a better avoidance of predators or a more rapid break-up of the dead shell.