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| Calliostoma | |
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| The shell of Calliostoma selectum | |
| Scientific classification | |
| Kingdom: | |
| Phylum: | |
| Class: | |
| (unranked): | clade Vetigastropoda |
| Superfamily: | |
| Family: | 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.
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