Klade

The Klade were a humanoid species who lived on the Needle in the far future.

History
On the Needle, the Klade were led by Prefect Ferran. The Doctor once encountered the Klade on Falkus. (PROSE: Father Time)

The Doctor mentioned the Klade as being a potential threat to Gallifrey. (PROSE: The Infinity Doctors) Marnal claimed that the Klade had the power to destroy the Time Lords and Gallifrey, but admitted that they would not have had the nerve to do so. (PROSE: The Gallifrey Chronicles)

Closer to the end of the universe, Gordel theorised that the Needle People were the super-evolved survivors of the Thal race, fleeing the Final Dalek War. (PROSE: The Infinity Doctors)

Behind the scenes

 * Klade is both an anagram of "Dalek" (as "Dalek" is itself of "Kaled") and a play on the biological term "clade", which is a group of species sharing a common ancestor. According to the non-narrative source AHistory, the Klade were the humanoid descendants of the Daleks.
 * In Lance Parkin's rejected pitch for a Eighth Doctor novel called Enemy of the Daleks, the Klade were confirmed to be the humanoid descendants of the Daleks and the ultimate destiny of all life in the universe. To repent for the sins of their ancestors, the Klade joined an alliance, led by the Doctor's father, to fight the Enemy and avoid Last Contact.