Spider

Spiders are creatures that scuttle along the ground and attack  Autobots. The creatures are analogous to the spiders on Earth but unlike most Earthly spiders, Cybertronian spiders travel in groups. They glow a bright purple color, for they spawn from Dark Energon  Crystals. They are loyal to Decepticons.

Transformers: War for Cybertron
Spiders scuttle around in the depths of the Kaon Prisons. When Optimus, Bumblebee, and Sideswipe   escaped with the help of Air Raid, they continued along through a spider and Cloaker infested area. The trio found they could simply squash the pesky arachnids underfoot and continued on. When Megatron appeared to Optimus by transforming a room's infrastructure, and made the typical "You're going to die." speech, he summoned a wave of spiders to attack the Autobots.

Later, in the fight against Trypticon, the giant reptilian robot sent the spiders after Optimus Prime, Bumblebee, and Ironhide in a large cluster, only to have them simply swatted away.