Xenomorph

The "Xenomorph" was an alien species, which the Sixth Doctor once observed in Crozier's laboratory. (TV: Mindwarp)

K9 Mark 2 once recommended "rapid movement in the opposite direction of the xenomorph". (TV: Liberation)

Behind the scenes
The Xenomorph was the titular alien antagonist from Alien and Aliens, however, there has yet to be any narrative connection to suggest show that the Xenomorph is from the N-Space equivalent of the Alien franchise;so for all intents and purpose, the Xenomorph are a genuine species that exists within the Doctor Who universe.