Quermia was populated by Xextos, who were left there by some Arkanians who wanted to see how they'd evolve over many years in isolation. Unfortunately, the Arkanians lost interest after a few weeks, and nobody visited Quermia until about 10,000 years later. By then the Xexto's had evolved into Quermians. If anyone had rememebered why they were there in the first place, they would have been very impressed. During the Jedi Civil War, Quermia sided with Darth Revan. Well done there.