Limpet is a common name used for many kinds of saltwater or freshwater snails, specifically those that have a simple shell which is more or less broadly conical in shape, and which is either not coiled, or appears not to be coiled, in the adult snail. The word "limpet" is a very inexact name which is fairly frequently encountered as part of the common name of a wide variety of different marine and freshwater gastropod species, some of which have gills and some of which have a lung. Limpets have flattened, cone-shaped shells, and the majority of species are commonly found adhering strongly to rocks or other hard substrates, looking like little bumps on the surface. In life, many limpet shells are often covered in microscopic growths of green marine algae, which can make them even harder to see, as they can closely resemble the rock surface itself. The majority of limpet species have shells that are less than 3 in (8 cm) in maximum length and many are much smaller than that. You can download a recipe for limpet stovies here.