05 Rissoa membranacea.

05 Rissoa membranacea.

Juvenile with translucent shell and no labial varix, and periphery of body whorl is distinctly angulated (1). Aperture oval; very slightly everted lip on columellar area (2) but barely perceptible in parietal area (3). Shell height 4.9 mm. Orkney, Scotland. May 2017. Leg. S. Taylor.

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