Dinosaurs A to Z

Dinosaurs beginning with the letter O

On the following pages we have assembled an ever growing library of dinosaurs for your reference.  (Current article count is: 367)

If you encounter any errors or typos or if you would like to request that a specific type of Dinosaur be added to the list, please take a moment to EMAIL US and let us know.

Name Era Description
Ohmdenosaurus
Oligosaurus Junior synonym of Rhabdodon
Olorotitan
Omeisaurus
Omnivoropteryx Probably a bird
Omosaurus Preoccupied name for what is now known as Dacentrurus
Onychosaurus "synonym of Rhabdodon, or a dubious ankylosaurian "
Opisthocoelicaudia
Oplosaurus
Orcomimus
Orinosaurus Junior synonym (unneeded replacement name) of Orosaurus
Ornatotholus
Ornithodesmus
Ornithoides nomen nudum of Saurornithoides
Ornitholestes
Ornithomerus Junior synonym of Rhabdodon
Ornithomimoides
Ornithomimus
Ornithopsis
Ornithosuchus Actually a non-dinosaurian archosaur
Ornithotarsus Possible junior synonym of Hadrosaurus
Orodromeus
Orosaurus Possible junior synonym of Euskelosaurus
Orthogoniosaurus
Orthomerus
Oryctodromeus
Oshanosaurus nomen nudum
Othnielia
Othnielosaurus
Otogosaurus nomen nudum
Ouranosaurus
Oviraptor
Ovoraptor nomen nudum of Velociraptor
Ozraptor


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