Plutomurus ortobalaganensis is the deepest terrestrial animal ever found on Earth, living at 1,980 metres (6,500 ft) below a cave entrance.

[1][2] It is a species of springtail (arthropods) endemic to the Krubera-Voronja cave system in Abkhazia, Georgia.

It was discovered in the CAVEX Team expedition of 2010.

[3] It feeds on a few fungi and decomposing organic matter in the caves.

[4] It has a long antennae and is eyeless, it has a grayish body and has darker spots covering it.