Xyrillian

The Xyrillians were a spacefaring humanoid species from the planet Xyrillia. In 2151, the Enterprise (NX-01) made first contact with a Xyrillian spaceship that was riding in Enterprise's wake for a brief time. It eventually caused several power malfunctions on the Earth spaceship, however the Xyrillians were only trying to fuel their warp coils with the plasma exhaust.

Xyrillians have distinct dermal plates, and they show signs of harmless bioelectric energy when they touch other people. They do not have a metabolism based on water or breathe an oxygen-based atmosphere. In fact, their high-pressure atmosphere is hallucinogenic to most species, and as a result most other humanoids need to be weaned onto and off their atmosphere to avoid undesired effects.

They also seem to be somewhat telepathic by using certain granules to either enhance or provide the effect in the first place. This procedure of this granule-induced telepathic interaction is considered a game, though it is possible that Xyrillians impregnate each other during it. It also works with other species, and most likely on both genders. In 2151, Commander Charles Tucker III was impregnated this way, and he successfully carried an embryo for at least one month. The embryo, a female one, appeared to be in healthy condition, and was later transferred to a Xyrillian host.

By the 24th century, Xyrillia eventually became a member of the United Federation of Planets.