Wikipedia
Trochidae
The Trochidae, common name top snails, are a taxonomic family of very small to large sea snails, marine gastropod molluscs in the clade Vetigastropoda (according to the taxonomy of the Gastropoda by Bouchet & Rocroi from 2005).
This family is commonly known as the "top snails", because in many species the shell is shaped like a toy top.
Usage examples of "trochidae".
Turritellae, Spindle-shells, Cerithia, as well as in the shells with flattened cones, Trochidae, Turbines.