Malea pomum, common name the Pacific grinning tun, is a species of large sea snail, a marine gastropod mollusk in the family Tonnidae, the tun shells. The color of the animal is of a beautiful white, marked upon its circumference with triangular flames of a violet brown.
The Tonnidae are a family of medium-sized to very large sea snails, known as the tun shells. They are found in all tropical seas, where they inhabit sandy areas. During the day, they bury themselves in the substrate, emerging at night to feed on echinoderms (especially sea cucumbers), crustaceans, and bivalves.