| Notocochlis gualteriana, Naticarius onca, Tanea, Tanea undulata, Naticarius orientalis|
Tectonatica violacea, common name the violet moon snail, is a species of predatory sea snail, a marine gastropod mollusk in the family Naticidae, the moon snails.
Tectonatica violacea Wikipedia
The size of the shell varies between 12 mm and 25 mm.
This species occurs in the Indo-West Pacific off the Mascarene Basin; also off the Philippines and Australia (Queensland)