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.

[1][2] The size of the shell varies between 34 mm and 90 mm.

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

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