Apparently, "Cybertronian butterflies" are roughly of the same size as butterflies on Earth, making them extremely tiny to Cybertronian understanding. They are also as colourful as their counterparts on Earth, but, being made of metal, are a bit more resilient. Given the track record Transformers have on naming their planet's fauna, these creatures are probably called robotterflies or something equally creative.

Citadel Paints on Blackarachnia and some Predacon figure fodder from Transformers Prime. Based on artwork by Nickinamerica.