06 Rissoa membranacea.

06 Rissoa membranacea.

The flimsy operculum is pale horn-colour, semi-transparent. It forms an excentric spiral with the nucleus near the columellar lip when withdrawn. Operculum from shell 7.4 mm high. Orkney, Scotland. May 2017. Leg. S. Taylor.

marinvert.senckenberg.science/image-browse/