This circular operculum commences as a multispiral disc, like that of a Trochus, upon the outer side of which is deposited a thin calcareous layer by a lobe of the foot which projects partly over it.

This arrangement produces an operculum which exhibits all the whorls beneath, but which is only feebly, or not obviously spiral above, from the more or less general distribution of the calcareous matter.

[3] The first Turbo species were found in the Upper Cretaceous, approximately 100 million years ago.

Turbo cornutus, common name the "horned turban", is an expensive food item in Korea, and Japan, where they are known as sazae.

[citation needed] The attractively colored operculum of at least two different Turbo species has been used for various decorative purposes, including in jewelry and buttons.