Hydrobia ulvae aperture and operculum. Arrow indicates pointed adapical end of aperture. From salting pool, salinity 22.7p.p.t., Aust, Severn Estuary. Most specimens from this site with sulphide-rich anaerobic mud had extensive black encrustation.

Submitted by Ian Smith on Tue, 30/08/2011 22:26
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I.F. Smith
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 Shell height 4mm with shallow sutures and flat whorls.