Spheroids

The Spheroids is a species of sphere like shape. Their history and language remain unknown to humans. Despite their homeworld, Spheron 1, is of no military strategic value, Earth invaded them anyway. The Spheroids are ruled by the Brain Balls, whom are the only know members of their species known with the ability to communicate.

As a consequence of the war with Earth, the Spheroids lost their homeworld, and had to move off world to places unknown. Though, the sighting of them in Into the Wild Green Yonder seems to confirm that they are not extinct though.