Saturnine is a species of bioluminescent fungoid found within the darker, danker regions of Tallon IV. They are not known to be harmful to any species, but are notable for their beautiful blue glow. Many Saturnines located in the deeper caverns of the Phazon Mines became tremendously overgrown and bloated in size due to heavy exposure to Phazon ore. Even still with this mutation, they remain harmless. It is unknown if these mutative Saturnines have died off or whether or not they will bring on a new breed of large Saturnines with the elimination of the galaxy's Phazon.
- Metroid Prime (First appearance)