Alvania fenestrata

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

Description
The length of the shell attains 4 mm, its diameter 2 mm.

The smooth protoconch consists of three whorls, forming a conical apex. There are three postnatal whorls. The sculpture consists of 16-18 axial riblets that continue across the base. There are two spiral lirae on Ist and 2nd whorls, 3 on 3rd. The intersections are nodulose. The base of the shell contains three spiral lirae.

Distribution
This species occurs off the coast of KwaZulu-Natal, South Africa.

Fossils were found in Pleistocene strata in the Little Brak River, South Africa.