Cyber-tick

A cyber-tick is a very small Cybertronian lifeform. They're not well-liked and might be related to astro ticks and/or mech-ticks.

It is confirmed that they are (at least in one universe) sentient.

Fiction

Titan movie comics

Incinerator expected to be shook off Cybertron like a bad case of cyber-ticks. Return to Cybertron: Part 3

IDW Revenge of the Fallen adaptation

Rampage threatened Sam Witwicky to crush his parents like cyber-ticks unless he handed him over the Matrix. Revenge of the Fallen #4

2015 Robots in Disguise cartoon

Among the prisoners on the Alchemor was a cyber-tick named Minitron who was able to control other bots by biting them. He did so with Grimlock, using the large Dinobot to steal Underbite's stasis pod for Steeljaw. True Colors