Calliostoma alternum

Calliostoma alternum is a species of sea snail, a marine gastropod mollusk in the family Calliostomatidae.

Description
The height of the shell attains 16 mm. The umbilicate shell has a conical shape. It is finely sculptured. The aperture is subquadrate wit thin lips. The rather thin columella is weakly sigmoid and ends in a rounded denticle.

Distribution
This species occurs in the Caribbean Sea off Colombia, Venezuela and Suriname.