Bomb Parasite

From Wikitroid, the Metroid wiki

Bomb Parasites, also called Bugs, Blootiks, and Bomb Bugs, are small creatures native to Zebes. In Metroid: Zero Mission, they attach themselves to Samus Aran, causing damage with large numbers until she obtains the Varia Suit. They are the only creatures that can destroy Zebes Bio-Barriers (By consuming them). Bomb Parasites can be destroyed by Bombs.