Rissoina spirata

Rissoina spirata, the spiral risso, is a species of minute sea snail, a marine gastropod mollusc or micromollusc in the family Rissoinidae.

Description
The size of the shell varies between 7 mm and 15 mm.

Distribution
This species occurs in the Red Sea, in the Indian Ocean off Madagascar and the Aldabra Atoll; in the Central Pacific; in the Mediterranean Sea.