Cyclostrema pruinosum Chaster 1896 Dikoleps pruinosa is a minute species of sea snail, a marine gastropod mollusk in the family Skeneidae.

It is whitish in colour, dull and frosted in appearance, owing to the entire surface being covered with very numerous, fine, close -set, flexuous striae following the direction of the lines of growth.

On the umbilical area and adjoining part of the base there are also numerous, much stronger spiral lines, finely granulated by the striae just described.

The outer lip is thin, presenting two shallow sinuations, one at the periphery and one below.

[2] This species occurs in the Mediterranean Sea.