Appearance: Rough, plump shell with distinct ridges. The aperture is round with the top edge meeting the shell at right angles. The shell colour varies from green to orange.
Depth: Upper shore.
Feeding: Rough periwinkle is a consumer. It is a herbivore scraping algae from rocks.
Environment: Rough periwinkle is found quite high on the rocky shore, in the same zone as spiral wrack and channelled wrack.
Other facts: This snail survives many hours out of water by storing water in its shell and carries out gas exchange using the oxygen that dissolves from the air into this water.
Classification: Rough periwinkle is a member of the invertebrate animal group mollusca.