Calliostoma schroederiCalliostoma schroederi, common name Schroeder's top shell, is a species of sea snail, a marine gastropod mollusk in the family Calliostomatidae.DescriptionThe height of the shell attains 31.5 mm. The shell is white and spirals upward into a cone shape.DistributionThis species occurs in the Caribbean Sea and in the Gulf of Mexico at depths between 265 m and 439 m.