Obamadon - Lizard. Obruchevichthys - Amphibian, temnospondyl. Odontochelys - Reptile, turtle. Oedaleops - Pelycosaur. Ohmdenosaurus - Dinosaur, sauropod. Ojoceratops - Dinosaur, ceratopsian. Ojoraptorsaurus - Dinosaur, oviraptosaur. Oligokyphus - Therapsid, cynodont. Oligolactoria - Fish. Olorotitan - Dinosaur, hadrosaur (lambeosaur). Omeisaurus - Dinosaur, sauropod. Omoiosicista - Mammal, rodent. Omphalosaurus - Ichthyosaur. Onchopristis - Fish, large sawfish. Oncorhynchus rastrosus (Sabre-toothed salmon) - Fish, salmon. Onychonycteris - Bat. Oohkotokia - Dinosaur, ankylosaur. Opabinia - Cambrian lifeform. Ophthalmosaurus - Marine reptile, ichthyosaur. Ophiacodon - Pelycosaur. Ophiderpeton - Amphibian, lepospondyl. Opisthocoelicaudia - Dinosaur, sauropod (titanosaur). Opisthodactylus - Bird, rhea. Oreopithecus - Mammal, primate. Orkoraptor Dinosaur, allosaur. Ornimegalonyx - Bird. Ornithocheirus - Pterosaur, ornithocherid. Ornithodesmus - Dinosaur, dromaeosaur. Ornitholestes - Dinosaur. Ornithomimus - Dinosaur, ornithomimosaur. Ornithoprion - Fish, shark. Ornithopsis - Dinosaur, sauropod (titanosauriform). Ornithostoma Pterosaur, pteranodontid Ornithosuchus - Archosaur. Orodromeus - Dinosaur, ornithopod. Orohippus - Mammal, horse. Oromycter - Pelycosaur, caseid. Orovenator - Neodiapsid. Orthacanthus - Fish, shark (xenacanthid). Orthogoniosaurus - Dinosaur, theropod. Orycterocetus - Mammal, whale (predatory). Oryctodromeus - Dinosaur, hypsilophodont. Osmakasaurus - Dinosaur, ornithopod. Ostafrikasaurus - Dinosaur, spinosaurid. Osteolepis - Fish. Othnielia - Dinosaur, Neornithischiam. Othnielosaurus - Dinosaur, Neornithischian. Otodus - Fish, shark. Otsheria - Synapsid, anomodont. Oudenodon - Therapsid, dicynodont. Ouranopithecus - Mammal, primate. Ouranosaurus - Dinosaur, ornithopod (basal hadrosaur). Oviraptor - Dinosaur, oviraptorid. Owenetta - Parareptile. Oxalaia - Dinosaur, spinosaur. Oxyosteus - Placoderm fish. Ozraptor - Dinosaur. |