Effectively, the shell bears markedly gradate whorls, almost flat at their periphery, and separate from each other by a deep suture. Longitudinal microsculpture made up of prosocline growth marks. Columella straight, very inclined in front view; the aperture is typically triangular. – Downslope transportation: 500m deep, Capo Teulada, Cagliari, S. Sardinia. 1,2mm.