page_title: List of dinosaur genera
section_title: H
hierarchical_section_title: List of dinosaur genera / H
caption_attribution_description: Italiano: Fossil of Hypsilophodon, an ornithopod dinosaur Took the photo at Musee d'Histoire Naturelle, Brussels
context_page_description: Dinosaurs are a diverse group of reptiles of the clade Dinosauria. They first appeared during the Triassic period, between 243 and 233.23 million years ago, although the exact origin and timing of the evolution of dinosaurs is the subject of active research. They became the dominant terrestrial vertebrates after the Triassic–Jurassic extinction event 201.3 million years ago; their dominance continued throughout the Jurassic and Cretaceous periods. The fossil record demonstrates that birds are modern feathered dinosaurs, having evolved from earlier theropods during the Late Jurassic epoch. As such, birds were the only dinosaur lineage to survive the Cretaceous–Paleogene extinction event approximately 66 million years ago. Dinosaurs can therefore be divided into avian dinosaurs, or birds; and non-avian dinosaurs, which are all dinosaurs other than birds.
  This list of dinosaurs is a comprehensive listing of all genera that have ever been considered to be non-avian dinosaurs, but this list also includes some dinosaurs which are disputed to be either avian or non-avian, as well as purely vernacular terms.
context_section_description: "Hadrosauravus" – nomen nudum; junior synonym of Gryposaurus
  Hadrosaurus
  Haestasaurus
  Hagryphus
  Hallopus –  a crocodilian
  Halszkaraptor
  Halticosaurus
  Hanssuesia
  "Hanwulosaurus" – nomen nudum
  Haplocanthosaurus
  "Haplocanthus" – preoccupied name, now known as Haplocanthosaurus
  Haplocheirus
  Harpymimus
  Haya
  Hecatasaurus – junior synonym of Telmatosaurus
  "Heilongjiangosaurus" – nomen nudum
  Heishansaurus
  Helioceratops
  "Helopus" – preoccupied name, now known as Euhelopus
  Heptasteornis
  Herbstosaurus –  a pterosaur
  Herrerasaurus
  Hesperonychus
  Hesperornithoides
  Hesperosaurus
  Heterodontosaurus
  Heterosaurus - possible senior synonym of Mantellisaurus
  Hexing
  Hexinlusaurus
  Heyuannia
  Hierosaurus
  Hikanodon - junior synonym of Iguanodon
  Hippodraco
  "Hironosaurus" – nomen nudum
  "Hisanohamasaurus" – nomen nudum
  Histriasaurus
  Homalocephale
  "Honghesaurus" – nomen nudum; Yandusaurus
  Hongshanosaurus – junior synonym of Psittacosaurus
  Hoplitosaurus
  Hoplosaurus – junior synonym of Struthiosaurus
  Horshamosaurus
  Hortalotarsus – possible junior synonym of Massospondylus
  Huabeisaurus
  Hualianceratops
  Huanansaurus
  Huanghetitan
  Huangshanlong
  Huaxiagnathus
  Huaxiaosaurus - junior synonym of Shantungosaurus
  "Huaxiasaurus" – nomen nudum; Huaxiagnathus
  Huayangosaurus
  Hudiesaurus
  Huehuecanauhtlus
  Huinculsaurus
  Hulsanpes
  Hungarosaurus
  Huxleysaurus - junior synonym of Hypselospinus
  Hylaeosaurus
  Hylosaurus – junior synonym of Hylaeosaurus
  Hypacrosaurus
  Hypselorhachis –  a ctenosauriscid
  Hypselosaurus
  Hypselospinus
  Hypsibema
  Hypsilophodon
  Hypsirhophus
caption: Skeleton of Hypsilophodon.
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