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Calliostoma selectum.JPG
The shell of Calliostoma selectum
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
(unranked): clade Vetigastropoda
Superfamily: Trochoidea
Family: Calliostomatidae
Thiele, J., 1924
Genus: Calliostoma
Swainson, 1840

The Top shells (which are called Calliostoma) are marine gastropod molluscs. They can be found world-wide. The name of this genus is derived from the Greek words kallos (beautiful) and stoma (mouth), referring to the pearly aperture.