La rádula es una estructura que se localiza en la base de la boca y la concha de los moluscos (con la excepción de los representantes de las clases Bivalvia y los Scaphopoda); esta estructura está especializada en raspar el alimento. Está constituida por una cinta en la que se encuentran un número de hileras longitudinales de pequeños dientes quitinosos. La boca de los gasterópodos está localizada en la parte anterior y ventral de cuerpo. La boca está constituida por una cavidad en forma de saco (saco radular) en el cual se encuentra el aparato radular.

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The radula (plural radulae or radulas) is an anatomical structure that is used by molluscs for feeding, sometimes compared to a tongue. It is a minutely toothed, chitinous ribbon, which is typically used for scraping or cutting food before the food enters the esophagus. The radula is unique to the molluscs, and is found in every class of mollusc except the bivalves. Within the gastropods, the radula is used in feeding by both herbivorous and carnivorous snails and slugs. The arrangement of teeth (also known as denticles) on the radula ribbon varies considerably from one group to another. In most of the more ancient lineages of gastropods, the radula is used to graze, by scraping diatoms and other microscopic algae off rock surfaces and other substrates. Predatory marine snails such as the Naticidae use the radula plus an acidic secretion to bore through the shell of other molluscs. Other predatory marine snails, such as the Conidae, use a specialized radula tooth as a poisoned harpoon. Predatory pulmonate land slugs, such as the ghost slug, use elongated razor-sharp teeth on the radula to seize and devour earthworms. Predatory cephalopods, such as squid, use the radula for cutting prey. The introduction of the term "radula" is usually attributed to Alexander von Middendorff in 1848.

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