Calliostoma zizyphinum

Calliostoma zizyphinum, common name the European painted top shell, is a species of sea snail, a marine gastropod mollusk in the family Calliostomatidae.

It is sculptured with regular spiral grooves and ridges, traversed by fine prosocline growth lines.

The periphery is angular, encircled by a smooth rounded rib that becomes a supra-sutural band or fasciole on the spire.

Blotches on the keel are generally darker, more frequent and more regular than on other parts of shell.

This species is host to the following parasites:[1] The starfish Asterias rubens is a known predator of Calliostoma zizyphinus[3] This marine species occurs in European waters from Northern Norway to the Azores; in the Mediterranean Sea.