The Ariolo had a tough, almost leathery skin that was usually a dark grey or brown in color. They had angular heads that sloped upwards from a low forehead to the rear of the cranium. The jaw was angled down so that the mouth, which reversed the angular pattern to slope upward away from the line of the jaw and forehead, protruded slightly away from the face.
The name of this species comes from FASA's Star Trek IV Sourcebook Update. While strictly a non-canon source, it is the only widely recognized source for names of most of the Star Trek IValiens. Also according to that book, the Ariolo originated from a planet called Fillandia and had centaur-like torsos. The Ariolo are described as a hedonistic race who are reputed to be the best musicians in the galaxy. They are the only race known to the Federation that has no concept of time.
Fillandia is described as a large, humid world, dominated by tropical forests and mountain ranges. The planet is tidally locked and plagued by earthquakes and volcanoes.