Tectonatica violacea

Tectonatica violacea, is a common name the violet moon snail, is a species of predatory sea snail, a marine gastropod mollusk in the family Naticidae, the moon snails.

Description
The size of the shell varies between 12 mm and 25 mm.

Distribution
This species occurs in the Indo-West Pacific off the Mascarene Basin; also off the Philippines and Australia (Queensland)