Immersed, translucent, live sub-adult (left) and its dry, opaque, vacant shell (right), with no labial varix, but periphery of body whorl is smoothly rounded (1) as on mature adults. Aperture oval; slightly everted lip forms a continuous peristome around whole aperture and reflects slightly onto the body whorl in the columellar (2) and parietal areas (3). Shell height 7.4 mm. Orkney, Scotland. May 2017. Leg. S. Taylor.
Key Identification Features & Similar Species under image 02 Rissoa membranacea