The War Wasp is an insect species who have appeared in every Metroid Prime game to date excluding Metroid Prime 3: Corruption; however, a type of wasp did in fact appear in that game. They're enlarged wasp creatures who first appeared in Metroid Prime for the GameCube. They all live in wasp hives, which can be destroyed by missiles.
When an opponent approaches their nests, they imerge from their hives and ferouciously attack them by spewing blasts of energy from their stingers. Experienced members of the species called Barbed War Wasps are capable of shooting this energy as far away as 20 meters.