Manthas are an unused species in Metroid Prime 3: Corruption. An unused model and Logbook entry are present in the final game's files, along with sound effects. This species was likely intended to be frozen and used as a platform, given their flat upper side and weakness to cold.
Morphology: Mantha. Susceptible to cold-based weapons. Emits sonic bursts in self-defense.
Manthas are practically indestructible. Only low-temperature weapons have any effect on them, and then only to stun. The creatures use sonic bursts to attack potential meals.