Ondina warreniOndina warreni is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.DescriptionCompared with Ondina obliqua, the shell of Ondina warreni is smaller, its length varying between 0.8 mm and 3.2 mm. The basal striae are more distinct, and the umbilicus is more developed.DistributionThis species occurs in the following locations: European waters : Atlantic European coasts United Kingdom Exclusive Economic Zone Portuguese Exclusive Economic Zone : Madeira Spanish Exclusive Economic Zone : Canary Islands Mediterranean Sea : Greece, off Apulia, Italy