Rustbug

A rustbug is a tiny Cybertronian lifeform and nuisance that can transform into a primitive wheeled alternate mode for transportation.

Fiction

Earthforce

Starscream had brought a rustbug hoop to Earth, figuring that if it was useful on Cybertron, it could be useful there too. He was right. Bugged!

Beast Wars: Uprising

Spotting a rustbug close to his foot, Lio Convoy kicked it before it could start nibbling on him, causing it to transform and roll off. Broken Windshields

Wings Universe

Vector Prime described the original Nightracer, a legendary sharpshooter, as being able to hit a rustbug from a distance of over 15 hics. Ask Vector Prime, 2015/09/23