Volcano Keyhole Limpet

Fissurella volcano, commonly named the volcano limpet or volcano keyhole limpet, is a species of small to medium-sized sea snails, marine gastropod mollusks in the family Fissurellidae, the keyhole limpets. Like other members of the keyhole limpet family, the volcano limpet is not considered a "true" limpet.

Adults measure up to approximately 2.5-4.1 cm with a keyhole-shaped pore on the apex of its conical shell. They feed on benthic microalgae and potentially some macroalgal, or seaweed, fronds.