Halicephalobus mephisto: Διαφορά μεταξύ των αναθεωρήσεων
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| regnum = [[Animal]]ia
| phylum = [[Nematode|Nematoda]]
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| binomial_authority =(Borgonie & [[Tullis Onstott|Onstott]], 2011)<ref name=nature>{{cite journal|title=Nematoda from the terrestrial deep subsurface of South Africa|first=J. |last=Borgonie |coauthors=García-Moyano, A.; Litthauer, D.; Bert, W.; Bester, A.; van Heerden, E.; Möller, C.; Erasmus, M.; Onstott, T. C. |journal=[[Nature (journal)|Nature]] |pages=79–82 |doi=10.1038/nature09974 |issue=7349|year=2011|volume=474}}</ref>
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'''''Halicephalobus mephisto''''' is a species of [[nematode]], among a number of other roundworms, discovered by Gaetan Borgonie and [[Tullis Onstott]] in 2011. It was detected in or recovered from deep rock fracture water in several gold mines in [[South Africa]] around 0.9–3.6 km (2.2 miles) under the surface of the Earth.<ref name=nature/> Onstott said that "it scared the life out of me when I first saw them moving," and explained that "they look like black little swirly things."<ref name="BBC"/> The finding is significant because no other [[multicellular organism]] has ever been detected further than 2 km below the Earth's surface.{{Citation needed|date=June 2011}}
''Halicephalobus mephisto'' is resistant to high temperatures, it [[Asexual reproduction|reproduces asexually]], and feeds on subterranean bacteria. According to [[radiocarbon dating]], these worms live in ground water that is 3,000–12,000 years old.<ref name=nature/> The worms are also able to survive in waters with extremely low levels of oxygen; lower than 1% of the level of most oceans.<ref name="BBC"/> It is named after [[Mephistopheles]],<ref name="BBC"/> which means "he who loves not the light" and alludes to the fact it is found so deep under the Earth's surface.<ref name="nature"/>
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