Calliostoma gualterianum

Calliostoma gualterianum, common name Gualtieri's top shell, is a species of sea snail, a marine gastropod mollusk in the family Calliostomatidae.^[4]

Calliostoma gualterianum
Drawing of a shell of Calliostoma gualterianum
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Vetigastropoda
Order:	Trochida
Superfamily:	Trochoidea
Family:	Calliostomatidae
Genus:	Calliostoma
Species:	C. gualterianum
Binomial name
Calliostoma gualterianum (Philippi, 1848) [1]
Synonyms
Trochus gualterianus Philippi, 1848 (original description) Trochus gualtierianus Fischer [2] Trochus gualterii Weinkauff [3]

Description

The size of the shell varies between 10 mm and 17 mm. The imperforate, polished, solid shell has a conical-elevated shape with 9 whorls. It is yellowish-brown or olive, clouded with brown, the earlier 4 whorls dark bluish or greenish. The shell is spirally sulcate, the 2d whorl somewhat granulate. The rest of the whorls are smooth, flat, and with a narrow supra-sutural fasciole, which on the body whorl is not developed. The periphery is rounded angular. The base of the shell is smooth except for about 4 fine riblets around the axis. The aperture is smooth within. The nacreous columella is a trifle swollen at its base, and either purple or whitish inside.^[5]

Distribution

This species occurs in the Mediterranean Sea.