Crisilla aartseni

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

Description
Shell color ranges from creamy white to a dark brown, often with splotched patterning. Its average size is about 1.5 millimeters.

Distribution
It is most commonly founds around the southern Spanish coast, near the Gibraltar strait and the Alboran Sea.