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European Painted Top Shell
Species

European Painted Top Shell

Calliostoma zizyphinum, (Linnaeus, 1758)

marine

About European Painted Top Shell

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

Appearance

The solid, regularly conical shell is straight-sided and imperforate. The shell contains up to 12–13 whorls. It is sculptured with regular spiral grooves and ridges, traversed by fine prosocline growth lines. The apex is minute, composed of a single smooth rounded

whorl, Several whorls follow, each with 4 granose spiral ridges. These become smooth and either obsolete or narrow on the later whorls. The body whorl has a prominent peripheral keel bearing two broad ridges; ridges above suture in preceding whorls. Base of shell rather flat, inner lips reflected over shallow umbilical groove. The periphery is angular, encircled by a smooth rounded rib that becomes a supra-sutural band or fasciole on the spire. The base of the shell is nearly flat. The aperture is quadrate. The cylindrical columella is nearly straight.

Habitat

This marine species occurs in European waters from Northern Norway to the Azores; in the Mediterranean Sea.

Where to see it

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