04 Verruca stroemia

04 Verruca stroemia

Diameter 6 mm. The operculum is made of a single large tergum (1) and small scutum (2), fixed together when live to open as single lid hinged on the straight right side of the ‘D’ aperture. It has strong rope-like ridges covered with closely spaced transverse grooves. Menai Strait, February 2011.