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O.

Omeisaurus

Omeisaurus

Levi bernardo, CC BY-SA 3.0, via Wikimedia Commons

Type:Sauropod
Lived:Mid Jurassic, 169 – 159 million years ago
Weight:9,800kg
Length20.2m / 66ft
Diet:Herbivorous

Omeisaurus (oh-mee-sore-us) was a huge sauropod dinosaur that lived in the Bathonian – Callovian Ages during the Late Jurassic Period of what is now China, around 169 – 159 million years ago. Its name comes from Mount Emei, where it was discovered.

Omeisaurus measured 20 feet in length, 12 feet (4 metres) in height and weighed 9,800kgs. It had a bulky body and a very long neck which contained several more neck vertebrae that were larger than most other sauropods. Unlike other sauropods, its nostrils were located close to the end of its snout. Omeisaurus had 4 thick legs, a long tail and a very small head. The back of the Omeisaurus was higher at the hips than at the shoulders. The closest relative of Omeisaurus appears to have been the even longer-necked sauropod Mamenchisaurus, which had 19 neck vertebrae compared to the 17 of Omeisaurus.

Omeisaurus was a herbivore and must have eaten huge amounts of plant materal to sustain itself.

Opisthocoelicaudia

Opisthocoelicaudia

FunkMonk (Michael B. H.), CC BY-SA 3.0, via Wikimedia Commons

Type:Sauropod
Lived:Late Cretaceous, 72 – 68 million years ago
Weight:8,400 – 25,400kgs
Length11.4m – 13m / 37 – 43ft
Diet:Herbivorous
Dinosaur Info coming! soon

Ornitholestes

Ornitholestes

PaleoNeolitic, CC BY-SA 4.0, via Wikimedia Commons

Type:Small theropod
Lived:Late Jurassic, 156 – 145 million years ago
Weight:12.6kgs / 27Ibs
Length2.08m / 6.82ft
Diet:Carnivorous

Ornitholestes (Or-nith-oh-LES-teez) was a small theropod dinosaur who lived during the Late Jurassic period in the forests of North America around 156 – 145 million years ago.

Ornitholestes measured approximately 6.5 feet (2 metres) in length and weighed around 15 kilograms (25 pounds). It was a lightly built, hollow-boned bipedal dinosaur who was a very fast runner. Ornitholestes had a small head and a small bony crest on its snout which may have been used to attract mates. It had many sharp, conical teeth, an ‘s’ shaped, flexible neck and a long tapered stiff tail. The tail would probably have been used to counter-balance when this agile predator was chasing its prey.

Ornitholestes had long legs and was able to change direction very quickly when in pursuit of prey. Its arms were short and strong and it had hands that had 4 clawed fingers, one of which was tiny.

Ornithomimus

Ornithomimus

Tom Parker, CC BY-SA 4.0, via Wikimedia Commons

Type:Large theropod
Lived:Late Cretaceous, 74 – 65 million years ago
Weight:170kgs / 370Ibs
Length3.8m / 12ft
Diet:Carnivorous
Dinosaur Info coming! soon

Orodromeus

Orodromeus

Tomopteryx, CC BY-SA 3.0, via Wikimedia Commons

Type:Orthithopod
Lived:Late Cretaceous, 74 million years ago
Weight:170kgs / 370Ibs
Length2.5m / 8.2ft
Diet:Herbivorous
Dinosaur Info coming! soon

Oryctodromeus

Oryctodromeus_cubicularis_-_Museum_of_the_Rockies

Tim Evanson, CC BY-SA 2.0, via Wikimedia Commons

Type:Ornithopod
Lived:Late Cretaceous, 95 million years ago
Weight:22 – 32kgs / 48.5 – 70.5Ibs
Length2.1m / 6.9ft
Diet:Herbivorous
Dinosaur Info coming! soon

Othnielia

Dinosaur Info coming! soon
Type:Ornithopod
Lived:Late Cretaceous, 95 million years ago
Weight:10kg / 22Ibs
Length1.4m / 4.6ft
Diet:Herbivorous

Othnielia (oth-ni-ee-lee-a) was an ornithopod dinosaur, a genus of hypsilophodont, that lived in the Oxfordian – Tithonian stages during the late Jurassic Period, about 156-145 million years ago. Othnielia could be found in Colorado, North America and Utah.

Othnielia measured 4 feet (1.1 metres) in length, 1 foot (30 centimetres) tall at the hips and weighed 22.5 kilograms (50 pounds). It had a small skull with a beak that contained self-sharpening, chisel-like cheek teeth and large eyes. It may also have had cheek pouches. Othnielia was a bipedal dinosaur and moved around on 2 legs. It had long legs with very long shins and feet with 4 clawed toes. Its arms were small and it had hands with 5 clawed fingers. Othnielia was a fast, agile dinosaur who had a long stiff tail which was used as a counter-balance and balance when running and changing direction.

Othnielia was a herbivore and may have lived in herds. These dinosaurs laid eggs and probably cared for their young.

Ouranosaurus

Ouranosaurus

Audrey.m.horn, CC BY-SA 4.0, via Wikimedia Commons

Type:Ornithopod
Lived:Early Cretaceous, 115 – 100 million years ago
Weight:4,000kg
Length7m / 23ft
Diet:Herbivorous
Dinosaur Info coming! soon

Oviraptor

Oviraptor

PaleoNeolitic, CC BY 4.0, via Wikimedia Commons

Type:Small theropod
Lived:Late Cretaceous, 85 – 75 million years ago
Weight:33 – 40kg / 73 – 88Ibs
Length1.6m / 5.2ft
Diet:Omnivorous

Oviraptor (OH-vee-RAP-tor) was a small, bird-like dinosaur who lived in the late Campanian stage during the late Cretaceous period, about 88 – 70 million years ago in the deserts of Mongolia, China.

Oviraptor measured 6 – 8 feet (1.8 – 2.5 metres) in length, 2.6 feet (0.8 metres) in height and weighed around 25 – 35 kilograms (55 – 76 pounds). It was a lightly built, bipedal dinosaur that had long legs and was fast moving. Oviraptor had a curved, ‘s’ shaped neck and a strange parrot-like head. It had a toothless beak and powerful jaws built for crushing prey.

Oviraptor had powerful hind legs with 3 clawed toes on each foot and strong short forearms with 3 clawed fingers on each hand. The fingers were long and grasping and the claws measured 3 inches (8 centimetres) in length. A small, stumpy horn-like crest sat on its snout and was probably used for mating displays. The crest could differ between Oviraptor species and for males, females and juveniles.

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Last Updated on 09/07/2021 by admin