Science, Tech, Math › Animals & Nature What Is a Radula? Mollusks use radula to scrape food off of rocks with tiny teeth Share Flipboard Email Print Ed Reschke/Photodisc/Getty Images Animals & Nature Marine Life Key Terms Marine Life Profiles Marine Habitat Profiles Sharks Amphibians Birds Habitat Profiles Mammals Reptiles Wildlife Conservation Insects Forestry Dinosaurs Evolution View More By Jennifer Kennedy Marine Science Expert M.S., Resource Administration and Management, University of New Hampshire B.S., Natural Resources, Cornell University Jennifer Kennedy, M.S., is an environmental educator specializing in marine life. She serves as the executive director of the Blue Ocean Society for Marine Conservation. our editorial process Jennifer Kennedy Updated February 10, 2019 The radula is a special structure used by many mollusks to scrape food off rocks, to feed off of plants or create depressions in rocks that the mollusk uses for habitat. The radula has many rows of tiny teeth that are replaced as they wear down. Each row of teeth consists of marginal teeth, one or more lateral teeth and a median tooth. One animal that has a radula is the common periwinkle, which uses its radula to scrape algae off rocks for food. The limpet is a marine invertebrate that uses its radula to create a "home" by boring a shallow hole into a rock.