Hydrobia ulvae. Smallest specimen 2mm high, largest 6mm high. Top row; males (have penes), middle row; females or immature (lack penes), lowest row; juveniles. All from a population with deep shell sutures at the mouth of the Dee Estuary, Cheshire.

Submitted by Ian Smith on Tue, 30/08/2011 21:18
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I.F. Smith
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