Two-Spotted Keyhole Limpet

Fissurellidea bimaculata

Fissurellidea bimaculata is a small marine gastropod that belongs to the family Fissurellidae. This species can be identified by its distinctive shape and markings, featuring two prominent spots on its shell. It typically reaches a maximum length of about 2.0 cm. The Two-spotted Keyhole Limpet is often found in the intertidal to shallow subtidal zones, commonly residing on or beneath rocks, as well as in association with compound ascidians, sponges, and kelp holdfasts. Its distribution is primarily in the Northeast Pacific region. This limpet is primarily benthic, meaning it lives on the ocean floor, and is usually found at depths shallower than 40 meters, with most occurrences recorded at depths of around 20 meters or less. The Two-spotted Keyhole Limpet feeds on algae and other organic matter, grazing on the surfaces of its habitat. It exhibits a reproductive strategy typical of its order, being gonochoric and a broadcast spawner, with embryos developing into planktonic larvae before settling as juveniles. Diving encounters with the Two-spotted Keyhole Limpet can be intriguing, as divers may spot these small creatures clinging to rocks or other substrates. They may be observed in small numbers, often blending in with their surroundings. While they are not currently evaluated for conservation status, their presence across many dive sites indicates a stable distribution in their preferred habitats.