Clavus unizonalis

Clavus unizonalis, common name the one-zoned turrid, is a species of sea snail, a marine gastropod mollusk in the family Drilliidae.

Description
The size of an adult shell varies between 15 mm and 26 mm. The shell is nodosely plicate, smooth, or with a few close revolving lines at the base. The color is whitish or yellowish white, the body whorl below the periphery chocolate, sometimes with a white band at the base. The color of the interior is chocolate, with an irregular white superior band.

Distribution
This species occurs in the Red Sea, off northern Mozambique and in the demersal zone of the tropical Indo-Pacific off Mozambique, Japan, the Philippines, Indonesia, Papua New Guinea, the Solomon Islands, New Caledonia and the Loyalty Islands; also off Australia (Northern Territory, Queensland and Western Australia).

It has also been found in Pliocene strata of Papua New Guinea (age range: 5.332 to 2.588 Ma)