The aquatic Mollusca of Pevensey Levels SSSI is rich and varied: 20 gastropod, and 8 bivalve species were recorded during this survey including 3 nationally rare Red Data Book species. In terms of the quality of the mollusc fauna and the relatively large geographical area in which the species occur, at the time of the survey Pevensey Levels was by far the most important site of its type in the British Isles.
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