Fissurella nigra

Fissurella nigra, common name the black 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 45 mm and 110 mm.

Distribution
This marine species occurs in the Pacific from Paru to the Strait of Magellan (but not off the Galapagos Islands)