Clavatula diadema common name the diadem turrid, is a species of sea snail, a marine gastropod mollusk in the family Clavatulidae.[1]
The size of an adult shell varies between 14 mm and 38 mm. Shells typically have the opening on the right side. The shape of top of the shell is a steep cone with small rigid protrusions circling each layer.
This species occurs in the Atlantic Ocean from Senegal to Angola.