Phestilla minor is a species of sea slug in the Trichechidae family. It is a type of aeolid nudibranch (Latin for naked gills) under the Aeolidina suborder. Phestilla minor is a benthic sea slug that is a very small, slow-moving organism found in marine habitats all over the world. Phestilla minor is one of over 2000 species of sea slugs.