Plutonia (Плутония) is an early science fiction novel by Russian academician Vladimir Obruchev. It was written in 1915 in Kharkov and first published in the original Russian in 1924. Plot The title Plutonia refers to the novel's setting in a lost land. It is an underground world having its own sun, called Pluto for the Roman god of the underworld. The terrain is marked by dramatic geographic features and inhabited by prehistoric animals and primitive people. These are essentially the animal and plant life of previous geological periods in their natural surroundings. As the characters venture deeper into the underground area, they encounter more and more ancient life forms, back to dinosaurs and other Jurassic species. Prehistoric animals featured Non-avian dinosaurs Ceratosaurus Diplodocus Iguanodon Stegosaurus Triceratops Other extinct reptiles Deinosuchus Ichthyosaurus Megalochelys Plesiosaurus Pteranodon Unidentified Archosaur Other prehistoric animals included Mammals Cave Bear Cave Lion Glyptodon Gomphotherium Megacerops Megaloceros Neanderthal Paraceratherium Smilodon Uintatherium Unidentified Creodont Woolly Mammoth Woolly Rhino Birds Archaeopteryx Hesperornis In translation Besides English, the novel has been published in other languages: Spanish (1953), German (1953), Finnish (1954), Ukrainian (1955), French (1955), Czech (1941), Hungarian (1956), Romanian (1956), Latvian (1957), Portuguese (1960), and Polish (1966). See also Hollow Earth Lost world (genre) Pellucidar References 1915 science fiction novels 1924 science fiction novels Novels about dinosaurs Novels set in prehistory Russian science fiction novels Novels set in subterranea Lost world novels Hollow Earth in fiction