From the Super Mario Wiki
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An Unera (ウネラ) is a bee larva-resembling enemy found in the Tree Zone of Super Mario Land 2: 6 Golden Coins. Unera are one of the easiest enemies in the games to defeat. They crawl extremely slowly and have no real attack pattern. A simple jump attack or a fireball are enough to finish them off. A spiked version of Unera is known as Grubby.