The text below is the complete list for entries on this website.
| 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. |
