The Shelbug when young is weak and slow. Only when they've matured and reached their adulthood do they develop a shell of Phazite sporting sharp spines as a form of protection. Until then, they're extremely vulnerable. The Shelbug is a native to Bryyo.
 Logbook Entry
"Shelbugs are slow-moving roaming insects whose soft bodies are easily damaged. Until they reach maturity they will not develop their Phazite shell. Unable to retract into a shell to avoid damage, they must aggressively attack any potential threat. They will extend sharp spines to fend off attackers or propel these spines at enemies."
The Shelbug appears in the following games:
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