Obamadon - Lizard. Obruchevichthys - Amphibian, temnospondyl. Occacaris - Cambrian arthropod. Oceanotitan - Dinosaur, titanosaur. Ocepechelon - Turtle. Ocucajea - Whale. Odoiporosaurus - Pachypleurosaur. Odontochelys - Reptile, turtle. Oedaleops - Pelycosaur. Ogresuchus - Crocodile. Ohmdenosaurus - Dinosaur, sauropod. Ojoceratops - Dinosaur, ceratopsian. Ojoraptorsaurus - Dinosaur, oviraptosaur. Oklatheridium - Mammal, deltatherid. Oksoko - 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. Ondogurvel - Dinosaur, alvarezsaur. Onychodus - Fish. Onychonycteris - Bat. Oohkotokia - Dinosaur, ankylosaur. Opabinia - Cambrian lifeform. Ophthalmosaurus - Marine reptile, ichthyosaur. Ophthalmothule - Plesiosaur. Ophiacodon - Pelycosaur. Ophiderpeton - Amphibian, lepospondyl. Opisthocoelicaudia - Dinosaur, sauropod (titanosaur). Opisthodactylus - Bird, rhea. Opisthodontosaurus - Dinosaur, captorhinid. Oreopithecus - Mammal, primate. Orientognathus - Pterosaur, rhamphorhynchid. Orkoraptor - Dinosaur, megaraptoran. Ornatops - Dinosaur, hadrosaur. 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. Orthrozanclus - Cambrian lifeform. Orycterocetus - Mammal, whale (predatory). Oryctodromeus - Dinosaur, hypsilophodont. Oryctorhynchus - Rhyncosaur. Osmakasaurus - Dinosaur, ornithopod. Osonachelus - Turtle. Ostafrikasaurus - Dinosaur, spinosaurid. Ostromia - Dinosaur, anchiornithine. Otekaikea - Whale. Osteolepis - Fish. Otodus - Fish, shark. Otogosaurus - Dinosaur, sauropod. Otsheria - Synapsid, anomodont. Oudenodon - Therapsid, dicynodont. Ouranopithecus - Mammal, primate. Ouranosaurus - Dinosaur, ornithopod (basal hadrosaur). Ovatiovermis - Cambrian lifeform. Overoraptor - Dinosaur, paravian. Oviraptor - Dinosaur, oviraptorid. Ovoo - Monitor lizard. Owenetta - Parareptile. Owenodon - Dinosaur, ornithopod. Oxalaia - Dinosaur, spinosaur. Oxyosteus - Placoderm fish. Ozraptor - Dinosaur. |