British Wildlife Wiki
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The Lagoon Snail (Paludinella littorina) is a species of gastropod found in Britain.

This small snail reaches only 2mm in length as an adult, and because of this, is often overlooked. Found only by the coast, this rare snail is found in south west England and south Wales. The shell is usually whitish, and is similar in shape as the Flat Periwinkle, which is often mistaken for (juvenile). Found in caves, cracks and crevices, not far from the high tide mark, on rocky shores.

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