Tectarius pagodus

Tectarius pagodus is a species of sea snail, a marine gastropod mollusk in the family Littorinidae. That family is commonly known as the winkles or periwinkles.

Description
This species is the largest member of the genus Tectarius, and (like the rest of the family Littorinidae) is an herbivor.

Distribution
This species is endemic to the Indo-Pacific. It can be found in the upper part of the intertidal zone along rocky shores, and therefore does not often get submerged.