Fissurella maxima

Fissurella maxima, common name : the giant keyhole limpet, is a species of sea snail, a marine gastropod mollusk in the family Fissurellidae, the keyhole limpets.

Description
The size of an adult shell varies between 60 and 138 millimeters.

Distribution
This species occurs in the Pacific Ocean between Ecuador and Tierra del Fuego.