Alpida
From Tardis Wiki, the free Doctor Who reference
The Pipe People were the native inhabitants of Terra Alpha. They were forced to live under ground when humans colonised the planet. The Doctor help them start a rebellion against the human population. Once Helen A's government was brought down they started to live with the humans.(DW: The Happiness Patrol)
Behind the Scenes
It is probally not the species name but since the serial was produced 21 years ago I dont think we will get to know.
