Plutomurus ortobalaganensis

The record for depth. This eyeless springtail was collected about 1,980 meters below the surface in Krubera-Voronja Cave in the western Caucasus, and when it was described in 2012 it was the deepest land animal known. It lives on fungi, far beyond the reach of any plant. Unusually for a deep cave animal it still carries pigment, which may mean it reached those depths fairly recently. The same expedition turned up three other new springtail species, a reminder of how little of the deep underground has ever been sampled.