Subfissurella

Subfissurella is a genus of small to medium-sized sea snails, commonly known as keyhole limpets. They belong to the family Fissurellidae, which are marine gastropod mollusks. These snails are characterized by a distinctive hole or slit in the apex of their shell, which serves as an exhalant opening for water circulation. The genus Subfissurella is primarily found in the Southern Hemisphere, with many species inhabiting the coasts of South America and Antarctica.

The shells of Subfissurella species are typically conical and limpet-shaped, though they can vary in size and ornamentation depending on the specific species. The external surface of the shell may be smooth, ribbed, or spiny, and the color can range from white to brown or gray. The internal surface is usually smooth and pearly.

Subfissurella limpets are herbivores that graze on algae and other organic matter found on rocks and other substrates in intertidal and shallow subtidal zones. They are often found in cold-water environments. Like other keyhole limpets, they possess a muscular foot that allows them to adhere firmly to surfaces, protecting them from strong currents and predators. Their reproductive biology is typical of marine gastropods, involving external fertilization and planktonic larvae. Several species of Subfissurella have been described, and ongoing research continues to refine their taxonomy and understand their ecological roles.