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Glow Flies appear in Metroid II: Return of Samus. When dormant, they stick upon the wall with their abdomen flashing. When Samus comes close, they will curl and launch themselves at her. If they miss, they will re-attach to the opposite wall.
These insects appear to resemble the Plazmite of Tallon IV and the Fire Flea of Zebes. Whether or not there is a connection between them or this is simply a case of three separate species convergently evolving is unknown.
"When dormant, they stick upon the wall with their abdomen flashing. When Samus comes close, they will roll up and crash into her."
- It is unknown if the Glow Fly species was infected by the X Parasites, as Samus never encountered any Glow Fly-X in Fusion.