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United Federation of Planets logo.png XyrillianUnited Federation of Planets logo.png
United Federation of Planets
Average Male Height:
163 cm (5 ft. 4 in.)
to 193 cm (6 ft. 4 in.)
Average Male Weight:
59 kg (130 lb.)
to 104.3 kg (230 lb.)
Average Female Height:
157 cm (5 ft. 2 in.)
to 185 cm (6 ft. 1 in.)
Average Female Weight:
49.9 kg (110 lb.)
to 90.7 kg (200 lb.)
Minimum Academy Age:
Life Expectancy:
Distinctive Features:
PRC Rated:
NPC Rated:

Ah'len, a Xyrillian female

The Xyrillians are a peaceful, warp-capable species of humanoids.

Characterized by smooth, brown, scaly skin, their bodies' metabolisms are not based on water, nor does this species breathe an oxygen-based atmosphere. While traveling in space, Xyrillians grow edible vegetation on the bulkheads of their ships, and also have eel-like creatures swimming in tanks for consumption.

In 2151, the Enterprise made first contact with a Xyrillian spaceship that was riding in Enterprise's wake for a brief time. Eventually, this caused several power malfunctions on the Earth spaceship. However the Xyrillians made their intentions clear, and professed they were only trying to fuel their own warp coils with the Enterprise's plasma exhaust.

Their home star system and planet is named Xyrillia, located in the Alpha Quadrant. The system is a binary system with a A-class star and a F-class star.


Compared to other humanoids, this species' biology and physiology is considered unusual. The do not breathe oxygen, and their high-pressure atmosphere causes hallucinations to most other humanoid species. Humans are able to survive in their atmosphere, but must be weaned on and off in order to avoid any undesired effects. In turn, Xyrillians can also breathe a more typical-humanoid atmosphere, but must use a device similar to those that the Benzites use, or alternatively, undergo a constant series of injections.

Though documented as always technologically ahead of the Federation, Xyrillian ships typically grow edible vegetation on their bulkheads, as well as grow and store eel-like creatures in tanks in designated cargo bay-like holds. It is reasonable to believe that Xyrillians have food replicators, but prefer their food fresh.

Xyrillians also have dermal plating, which they believe are necessary for detecting each other's moods. They can also pass electricity to each other via tactile contact, though this was painless and could even be pleasant. Possibly, this can be seen similar to a playful pinch, or perhaps even flirting between two adults.


Xyrillian males usually carry their young to term in a pouch on the upper chest. They serve only as hosts, as offspring only contained genetic material from the mother. Impregnation is possible with only minor physical contact, and can be wholly unintentional on the mother's part. The impregnated male grows nutrient sacks similiar to Human mammory glands in their forearm while pregnant. Humans and Xyrillians are genetically compatible without medical intervention.


Since the Federation's first encounter with the Xyrillians, they have been documented as technologically superior (as of 2151).
At this time, they had the technology to simulate any environment they could envision (much like holodecks), as well as advanced stealth technology for their starships that helped them remain hidden from any suspicious ships.

In 2151, the Xyrillians exchanged their holographic technology with the Klingon Empire. It is uncertain what the Klingons gave them in return.