Xyrillian
- Appearance: Mammalian/reptilian, dark-amber scaled skin, three ridges running along scalp front to back
- Strong bio-electricity, allows low-level telepathy with technological assistance (ENT: "Unexpected")
- Metabolism not based on water, high-pressure atmosphere (slightly hallucinogenic to humans, possibly others) (ENT: "Unexpected")
- Mothers provide all genetic material for reproduction, fathers carry to term a la seahorses (ENT: "Unexpected")
- Advanced biotech; food grown on ship walls, ship possibly partially-biological (ENT: "Unexpected")
- Advanced holography tech (ENT: "Unexpected")
- Trading partners with Kantare
- Restricted trading otherwise after revelation of Klingons applying technology to torture prisoners (ENT Novel: A Choice of Futures)
- Courted for Federation membership early-2160s
- Efforts failed after collapse of Partnership of Civilizations due to Federation interference, leading Xyrillians to pull out of negotiations, sign on to Vissian technology trade embargo
- Trading restrictions lessen with Federation by 2260s; holodeck/rec room tech possibly based on Xyrillian tech (TOS Novel: The Case of the Colonist's Corpse)