About Fissurella volcano Reeve, 1849
Fissurella volcano Reeve, 1849, commonly known as the volcano limpet or volcano keyhole limpet, is a species of small to medium-sized sea snails. It is a marine gastropod mollusk that belongs to Fissurellidae, the family of keyhole limpets. Just like other members of the keyhole limpet family, the volcano limpet is not classed as a "true" limpet. Adult individuals of this species grow to approximately 2.5 to 4.1 centimeters in size, and have a conical shell with a keyhole-shaped pore at the apex. This species feeds on benthic microalgae, and may also eat some fronds of macroalgae, also known as seaweed. Fissurella volcano lives in the Western Pacific Ocean, specifically in California and Baja California. It inhabits the intertidal zone, where it is found on the undersides of rocks.