Hydrobia ulvae patterned heads. Left 4.5mm (yellow markings) and upper right 3.5mm (white markings) from Aust, Severn Estuary 22.7p.p.th.. Lower right from Dee Estuary, 33p.p.t., where it was only patterned specimen among 58 others with all-black heads.

Submitted by Ian Smith on Tue, 30/08/2011 21:36
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I.F. Smith
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