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
- Metabolism not based on water, high-pressure atmosphere (slightly hallucinagenic to humans, possibly others)
- Mothers provide all genetic material for reproduction, fathers carry to term a la seahorses
- Advanced biotech; food grown on ship walls, ship possibly partially-biological
- Advanced holography tech
- Trading partners with Kantare
- Restricted trading otherwise after revelation of Klingons applying technology to torture prisoners (ENT Novel: A Choice of Futures)
- 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)