Alvania geryonia

Alvania geryonia is a species of minute sea snail, a marine gastropod mollusk or micromollusk in the family Rissoidae.

Description
The length of the shell varies between 2.5 mm and 4 mm.

Distribution
This species occurs in the Mediterranean Sea off Corsica, France, Tuscany, Italy and Greece; also in the Atlantic Ocean off the Azores.