Stentarian

Stentarians (alternatively known as Ammonites) are a slightly tall omnicombinational robotic species.

Biology
Stentarians are robotic in biology, and they have the ability to fuse with other members of their species ranging up to sizes unimaginable.

Primax 1005.19 Gamma
Around the beginning of the Earth Stone Age, the Stentarians split into two factions, the Terradones and the Ammonites. They began a long and brutal civil war which caused a hatred towards all metallic life by the Galactic Council. The Ammonite faction infiltrated the Cybertronian Autobot faction, including an attempted invasion of Cybertron.

Primax 215.19 Epsilon
Hailing from the Andromeda Galaxy, the Ammonites first made contact with the races of the Milky Way when the Cybertronian Maximals and Predacons sent out an extragalactic expedition to Andromeda. This caused a catastrophic invasion by the Ammonites that made the Maximals ban intergalactic travel for all Cybertronians.