Microdonts are small, tooth-like structures typically found in some invertebrates, such as mollusks and annelids. They are composed of a single layer of calcified material and have no enamel or dentin. Microdonts are used for attachment, feeding, and protection, and may also play a role in species recognition. They are generally found in the ventral surface of the organism, though some species may have them in other areas. In some species, the microdonts may be arranged in distinct patterns, allowing for both aesthetic and functional purposes.