Description: Fissurella fascicularis Lamarck, 1822 - anterior view of a wobbly keyhole limpet shell. Family Fissurellidae - limpets use their radulae to scrape algae from hard substrates. They typically occupy rock intertidal shorelines. Date: 25 February 2011, 18:16. Source: Fissurella fascicularis (wobbly keyhole limpet) (San Salvador Island, Bahamas) 3. Author: James St. John.