Tenellia adspersa, common name the miniature aeolis, is a species of very small sea slug, an aeolid nudibranch, a marine gastropod mollusk in the family Fionidae. It is the type species of the genus Tenellia. In Britain this solitary species is referred to as the lagoon sea slug.

Tenellia adspersa is a small nudibranch commonly known as the Miniature Aeolis and the Lagoon Sea-Slug. It was first described from Odessa, Ukraine and is native to the Eastern Atlantic and Western Mediterranean. It has been introduced to the West coast of North America, Japan, Brazil, and the Caspian Sea.

Tenellia adspersa, common name the miniature aeolis, is a species of very small sea slug, an aeolid nudibranch, a marine gastropod mollusk in the family Fionidae. It is the type species of the genus Tenellia.