Alvania sanctipaulensis

Alvania sanctipaulensis is an extinct species of minute sea snail, a marine gastropod mollusc or micromollusk in the family Rissoidae.

Description
The length of the shell attains 3 mm, its diameter 2.75 mm.

Distribution
Fossils of this species were found in Oligocene strata in Aquitaine, France; age range: 28.4 to 23.03 Ma