Tonna zonataTonna zonata is a species of large sea snail, a marine gastropod mollusk in the family Tonnidae, the tun shells.DescriptionThe length of the shell varies between 100 mm and 280 mm.DistributionThis marine species has a wide distribution : East China Sea, South China Sea, the Philippines, Indonesia, Japan and New Zealand.Life cycle and mating behaviorMembers of the order Neotaenioglossa are mostly gonochoric and broadcast spawners. Life cycle: Embryos develop into planktonic trocophore larvae and later into juvenile veligers before becoming fully grown adults.