Ondina diaphana

Ondina diaphana is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.

Description
The lustrous, whitish shell is very thin and nearly transparent. Its length varies between 1.8 mm and 2.5 mm. The teleoconch contains five whorls. The sculpture is marked by microscopic growth lines. The oblique suture is narrow. The outer lip is flexuous, and deeply sinuous above. The columellar tooth is obsolete. The insignicant umbilicus is developed in the adult only.

Distribution
This species occurs in the following locations:
 * Atlantic Ocean : Azores
 * North Sea : European waters, United Kingdom
 * Mediterranean Sea