Deirr

The Deirr are a Federation member species from Deneb Kaitos IV. They resemble upright slugs made of wet brown leather, but they are eight feet long and five feet thick. They have one multipupiled eyeslit, below which is a vertically-oriented mouth containing many teeth. Beneath the mouth is an array of tentacles of varying sizes used to manipulate objects. Their laughter sounds like bubbling gastric juices. (TOS novel: My Enemy, My Ally)

A Deirr was amongst the Federation delegation to the planet Kropasar in August 2375. (SCE ebook: The Future Begins)