Alvania bartschi

Alvania bartschi 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 1.25 mm, its diameter 0.8 mm.

Distribution
Fossils of this species were found in late Pleistocene strata at Punta Piedra on the Burica Peninsula, Panama.