The species « is characterized by having a transparent, somewhat yellowish shell, in which oblique reddish lines stand out, which, viewed from the front, are arranged in a “V” shape with the summit pointing towards the aperture. According to Palazzi (1988), the shell of this species presents a strong radial roughness, a smooth protoconch and a bowed lip. » – Oliver, Templado & Kersting: “Gasterópodos marinos de las Islas Columbretes”, Iberus vol. 30 (2), p.78-80.

« …it is characterized by well marked and irregular radial roughness and by a typical colour given by yellow and white alternations. The spiral of development is more elliptic than in O. atomus », due to the last whorl which is much more « emphasized, covering a larger portion of the previous one. » – S. Palazzi: “Note sugli Omalogyridae mediterranei e Maderensi”, Boll. malac. vol. 24, Milano 1988, p.103.

Left: off Arkum, east of Silifke, Mersin province, SE. Turkey. 0,7mm. Right: washed ashore after storm, Los Cancajos, Breña Baja, Santa Cruz, eastern coast of La Palma, Canarias. 0,9mm. Original pictures provided by J. Trausel and F. Slieker, Natural History Museum Rotterdam, for WoRMS – (CC BY-NC-SA).