From the Super Mario Wiki
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Geemers (originally called "Zoomers") are recurring enemies throughout the Metroid series. They are spiked, bug-like enemies that move along the terrain.
Geemers also appear in Super Smash Bros. for Nintendo 3DS as Smash Run enemies, their appearance based upon that from Super Metroid. Like in their series of origin, they will move around the borders of terrain, though they can also turn around. Running into them results in the player getting damaged. If they are on the underside of a platform, making contact with them will cause a meteor smash effect on the player.
Super Smash Bros. for Nintendo 3DS