Phazon Hopper

A Phazon Hopper is a Hopper that has been mutated by Phazon. It is larger, more resiliant to damage and is more agressive and powerful. It has turned purple and has a large spike on its back. It is found on the GFS Valhalla and Phaaze. Some can enter Hyper Mode. When one enters Hyper Mode, it creates a Phazon shockwave whenever it hops. Also, the Hopper's body becomes covered in a hard crystallized Phazite, granting it better armour than it's non-mutated cousin. Oddly, while stated to be from Bryyo like the other Hoppers, none actually appear on Bryyo.

Logbook entry
Metroid Prime 3: Corruption: "Phazon Hoppers are more resilient than other Hoppers, but can still be damaged by standard weaponry. The crystallized Phazon covering their bodies provides additional protection from attack. Like other Hoppers, these are capable of long-range assaults. They will spit bursts of Phazon venom at prey from a distance."