From the Super Mario Wiki, the Mario encyclopedia
A Spiky Gloomba (also known as a Spiked Gloomba) is a Gloomba with a spike on its head. Because it has a spike on its head, Mario will get hurt if he jumps on it, unless he has the Spike Shield. In Paper Mario: The Thousand-Year Door, they appear in the Pit of 100 Trials in the Rogueport Sewers. They are much tougher than a regular Spiked Goomba. This Goomba variety, along with the Hyper Spiky Goomba, is the strongest in the game.
Paper Mario: The Thousand-Year Door
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