Fissurella crassa

Fissurella crassa, common name the thick keyhole limpet, is a species of sea snail, a marine gastropod mollusk in the family Fissurellidae, the keyhole limpets and slit limpets.

Description
The size of the shell varies between 34 mm and 90 mm.

Distribution
This species occurs in the Central Pacific to Peru and Chile; but not off the Galápagos Islands.