Deep beneath the surface of the Earth, in a dank and dismal cave, lives Hades, the invertebrate king of hell. 
 
 Named for the mythological god of the underworld, Geophilus hadesi is a newly discovered species of centipede that inhabits the deep caves of the Velebit Mountains in Croatia. Unlike most centipedes of the order Geophilomorpha, which only occasionally seek shelter in caves, G. hadesi spends all its life in this dark, underground environment. Today (June 30), the team of scientists who discovered the remarkable critter published the first-ever description of the animal in the journal ZooKeys. 
 
 G. hadesi is one of only two known species of centipedes that never leave their cavernous homes. The other underground dweller, Geophilus persephones (named for the queen of the underworld, Persephone), was first discovered in a cave in France in the 1990s. G. hadesi was named with this mythical queen in mind, according to Pavel Stoev, an associate professor of zoology at the National Museum of Natural History in Sofia, Bulgaria, and lead author of the paper detailing the new centipede species. [Creepy Crawlies & Flying Wonders: Incredible Cave Creatures] 
 
 Though its home, located nearly two-thirds of a mile (1 kilometer) below the Earth's surface, is a bit dark and gloomy, G. hadesi survives just fine, Stoev told Live Science. It has "exceptionally elongated" antennae and furlike body hair, or setae, covering its appendages, and these two features let the animal detect prey in total darkness, Stoev told Live Science. 
 
 Like most centipedes, G. hadesi feeds on living animals — most likely larvae, springtails (tiny, insectlike hexapods), worms, woodlice, spiders and other small prey. Though the centipede's bite is venomous, this "hellish" creature is likely completely harmless to humans, Stoev said. Not that G. hadesi spends much time with people. While scientists from the Croatian Biospeleogical Society have explored the Velebit Mountains where the Hades centipede lives, some of the crevices it inhabits are unreachable. One specimen was collected from a depth of 3,609 feet (1,100 meters), the deepest known habitat for any centipede. 
 
 G. hadesi has a long, flattened body that makes crawling around such rocky crevices easy. And its 33 pairs of legs end in thin claws that are "unusually long," according to the researchers. Like other creatures with pointy claws, such as the yeti crabs that inhabit the waters off Antarctica, the Hades centipede may have developed this feature in order to cling more securely to rocks. 
 
 "The change of a species' appearance is usually a result of a long evolution that is likely to have happened [over] the course of millions of years," said Stoev, who noted that the Hades centipede has also adapted to the deep caves' cold temperatures, which can drop as low as 37 degrees Fahrenheit (3 degrees Celsius). 
 
 Scientists aren't exactly sure why the Hades centipede started living underground in the first place (though it likely had nothing to do with losing a bet to Zeus and Poseidon). 
 
 "It could be a dramatic change in the outside temperatures and overall conditions that forced less-adaptive organisms to seek shelter underground where the conditions are more stable and less dependent on the outside fluctuations," Stoev said. 
 
 The Hades centipede isn't the only critter that inhabits the caves of Velebit mountain range, which spans 90 miles (145 km) of northwest Croatia. Scientists have already discovered a whole host of pale, cave-dwelling creatures there. And many more creatures likely remain to be discovered, Poev said. 
 
 Follow Elizabeth Palermo @techEpalermo. Follow Live Science @livescience, Facebook & Google+. Original article on Live Science. ||||| An international team of scientists has discovered the deepest underground dwelling centipede. The animal was found by members of the Croatian Biospeleological Society in three caves in Velebit Mts, Croatia. Recorded as deep as -1100 m the new species was named Geophilus hadesi, after Hades, the God of the Underworld in the Greek Mythology. The research was published in the open access journal ZooKeys. 
 
 Lurking in the dark vaults of some of the world's deepest caves, the Hades centipede has also had its name picked to pair another underground-dwelling relative named after Persephone, the queen of the underworld. 
 
 Centipedes are carnivores that feed on other invertebrate animals. They are common cave inhabitants but members of this particular order, called geophilomorphs, usually find shelter there only occasionally. Species with an entire life cycle confined to cave environments are exceptionally rare in the group. 
 
 In fact, so far the Hades and Persephone centipedes are the only two geophilomorphs that have adapted to live exclusively in caves, thus rightfully bearing the titles of a queen and king of the underworld. 
 
 Like most cave-dwellers, the newly discovered centipede shows unusual traits, some of which commonly found in cave-dwelling arthropods, including much elongated antennae, trunk segments and leg claws. Equipped with powerful jaws bearing poison glands and long curved claws allowing to grasp and tightly hold its prey, the Hades centipede is among the top predators crawling in the darkness of the cave. 
 
 The new species is yet another addition to the astonishing cave critters that live in the Velebit, a mountain that stretches over 145 km in the Croatian Dinaric Karst, which is as a whole considered a hot spot of subterranean diversity. The deepest record comes from the Lukina jama - Trojama cave system, which is 1431 meters deep and is currently ranked the 15th deepest cave in the world. 
 
 Just like Hades who ruled over the kingdom of shadows, the new centipede dwells among an extraordinary number of pallid cavernicolous animals, some known to science and many yet to be discovered. 
 
 "When I first saw the animal and its striking appearance, I immediately realized that this is a new, hitherto unnamed and highly adapted to cave environment species. This finding comes to prove once again how little we know about the life in caves, where even in the best prospected areas, one can still find incredible animals" says the lead author Pavel Stoev, Pensoft Publishers and National Museum of Natural History, Sofia. 
 
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 Original Source: 
 
 Stoev P, Akkari N, Komerički A, Edgecombe GD, Bonato L (2015) At the end of the rope: Geophilus hadesi sp. n. - the world's deepest cave-dwelling centipede (Chilopoda, Geophilomorpha, Geophilidae). In: Tuf IH, Tajovský K (Eds) Proceedings of the 16th International Congress of Myriapodology, Olomouc, Czech Republic. ZooKeys 510: 95-114. doi: 10.3897/zookeys.510.9614 ||||| Discussion 
 
 On the taxonomic position of G. hadesi sp. n 
 
 On the habitat of G. hadesi sp. n
– Scientists hoped they'd find some exotic creatures burrowing through some of the deepest caves in Croatia, and they did not come up short. Meet Geophilus hadesi—or "Hades," named for the Greek god of the underworld—a subterranean centipede discovered in the Velebit mountain range by the Croatian Biospeleological Society, per a press release. The carnivore eats other invertebrates and also shows some longer-than-average legs and antennae (which help it find prey in total darkness, LiveScience notes), as well as jaws filled with poison. But what really makes this "centipede from hell" unique is that it's one of "only two remarkably troglomorphic geophilomorphs hitherto known," per the study in ZooKeys. Translation: It's one of only two centipede species that never leaves its cave dwellings, earning it its alternate title of "king of the underworld." And Hades has a queen, too, who never leaves her own underground domicile: Geophilus persephones, or "Persephone," named for the Greek goddess of the underworld, per LiveScience. That species was discovered in southern France in 1999, the study notes. Hades has a couple of features that scientists believe emerged as evolutionary adaptation traits, including long claws at the end of its 33 pairs of legs (perhaps so it can cling to rocks) and the ability to withstand the caves' chilly temps, which can hover in the 30s. How they migrated to these underground dwellings in the first place isn't certain, but the lead author of the study tells LiveScience that it could have been "a dramatic change in the outside temperatures and overall conditions that forced less-adaptive organisms to seek shelter underground where the conditions are more stable and less dependent on the outside fluctuations." (A centipede bite could provide more pain relief than morphine.)