Cyclostrema fenestratum Chaster, 1896 (original combination) Parviturbo fenestratus is a species of a rare, smallsea snail, a marine gastropod mollusk in the family Skeneidae.

[1] The size of the shell varies between 1 mm and 2 mm.

This species occurs in the Central Mediterranean Sea; in the Atlantic Ocean off the Canary Islands and of Tanger, Morocco.

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