42 Rissoa membranacea COMPARE Rissoa parva

42 Rissoa membranacea COMPARE Rissoa parva

Typical adult R. parva can usually be easily identified by the brown falciform mark (comma) across the labial varix on adults. The comma is diagnostic when present, but sometimes absent. Menai Strait, Wales and (largest, 4.1mm) Dorset, England.

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