Humanoid race from Delta IV. Members of the Federation for over a century. Deltan's have characteristically little body hair, especially a bald head. Deltans have an inherent talent for mathematics and geometry. The Deltan race has a very highly developed sexuality and some form of sexual expression is inherent in most aspects of Deltan culture. Deltans are the one known humanoid race in which pheromones play a major role. Deltan pheromones cause powerful sexual stimulation in almost all humanoid species. Deltans have limited telepathic abilities.