Extinct Alien races in Star Wars

On Naboo the aging and talk of an alien race that built great ruins, and even fled to one of the sites seen in The Phantom Menace. What are some alien civilizations that are hinted at in the EU, but never really given much exploration into their societies/way of life? Did the game/book reveal how they vanished or did the long vanished culture still have influence over the present day?

The Taung.

The race from the last Legends book, Honor Among Thieves

The race of bee/wolf mutants that Dooku committed genocide against and wiped out their planet.

Ths Dimeans.