A Piranhacus Giganticus is an enemy in Super Mario Galaxy 2. It looks like a regular Piranha Plant. BUT! This one is 10 times bigger. It is so big, Mario/Luigi has the ability to stand on its Warp Pipe. They only appear in the Supermassive Galaxy. Piranhacus Giganticus will constantly go in and come out of the dirt-filled center of its Warp Pipe, damaging the player if they are in the center of the Warp Pipe or too close to it. You must watch where this Piranha Plant is and what it is doing to keep Mario alive. These enemies cannot be defeated.