Halicephalobus mephisto is a species of nematode, among a number of other roundworms, discovered by geoscientists Gaetan Borgonie and Tullis Onstott in 2011. It was detected in ore recovered from deep rock fracture water in several gold mines in South Africa , , and under the surface of the Earth. because no other multicellular organism has ever been detected farther than below the Earth's surface.
Halicephalobus mephisto is resistant to high temperatures, it reproduces asexually, and feeds on subterranean bacteria. According to radiocarbon dating, these worms live in groundwater that i...