Miniroid

The Miniroid is an infant Phazon Metroid. They are found in large floating swarms, mostly on the Valhalla and planet Phaaze. Miniroids are often found with fully mature Phazon Metroids. They are not aggressive. Because of all the mutations to the Metroid species, the Phazon Metroids normally don't live past Infant stage. They evolved around this by creating Miniroids, even smaller versions of Metroid. To avoid premature death they travel in swarms to up their chances of survival. They bear a striking resemblence to the more aggressive Infant Tallon Metroids seen only in Metroid Prime 2: Echoes. Unlike Infant Tallon Metroids, they will not grow up by touching phazon. They are not agressive but often drift over areas where you must jump.

The eggs from which they are believed to hatch from appear to be very large compared to the Miniroid, possible indicating that numerous Miniroids inhabit each egg. Unknown cocoons can be found near them on, and these are likely the next step in their life cycle, from which Phazon Metroids will emerge.

Logbook entry
Metroid Prime 3: Corruption: "Miniroids, tiny and weak, will travel in a flock for protection. They float and fly about in search of sustenance. Those that survive will grow quickly, becoming the feared parasites known throughout the cosmos as Phazon Metroids."