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We don't know the name of this thing.
But we do know where it came from. So we're using that to title the page logically. If you know a better, more precise name, tell us.
Istervaalans were a species that had evolved from mountain goats on the planet Istervaal. The Tenth Doctor claimed of the species, "Evolution didn't take a funny old turn there". (PROSE: Ghosts of India)
Behind the scenes
The species is simply used for a gag in Ghosts of India, and the Doctor never actually names the species. Thus Istervaalan may only be a demonym rather than a proper species name.