Deltan (mirror)

In the mirror universe, the Deltans were a subject species of the Terran Empire.

As of the 2260s and 2270s, Deltans could be found serving on board Imperial Starfleet vessels. Lieutenant $𝜇$ was one such Deltan who served aboard the ISS Enterprise (NCC-1701) under the command of Admiral $𝜇$.

Just as in the Federation universe, mirror Deltans produced strong pheromones which acted as aphrodisiacs towards other species such as $𝜇$s. As a result, some Deltans, perhaps even willinglingly, served as virtual sex slaves to high ranking officers within Starfleet. Not all species within the empire were susceptable to their influence, this included $𝜇$s who were immune to Deltan pheromones.

It was known by some in Starfleet that Deltans possessed rudimentary telepathic abilities; however, these abilities were not powerful enough to warrant their extermination by the empire (TOS novel: The Sorrows of Empire).