Plutomurus is a genus of springtails belonging to the family Tomoceridae. Species: Plutomurus abchasicus Plutomurus baschkiricus Plutomurus ortobalaganensis...

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

Deuteraphorura kruberaensis, Schaefferia profundissima, and Plutomurus ortobalaganensis; the last of these is the deepest terrestrial animal ever found...

and there are numerous cave adapted species, including one, Plutomurus ortobalaganensis living 1,980 metres (6,500 ft) down the Krubera Cave. The horizontal...