Dinosaur Names that Start with “O”

Check out the alphabetical list of dinosaur names beginning with the letter “O”. We’ll look at dinosaur pictures and discuss what their names mean, as well as learn more about dinosaur facts.

Dinosaurs with names that begin with the letter “O”


Ohmdenosaurus dinosaur

Ohmdenosaurus was a tiny sauropod that lived in what is now Baden-Württemberg, Germany, during the early Jurassic period.

The generic name Ohmdenosaurus means “Ohmden lizard,” after the commune and town in Baden-Württemberg where the dinosaur’s remains were discovered.


Ojoceratops dinosaur


Ojoceratops is a Chasmosaurin genus from North America. Ojoceratops discoveries could be from the genus Triceratops.

The generic name Ojoceratops derives from the name of the formation (full name Ojo Alamo) in which it was discovered, which means “the horned face of Ojo” (Ojo + Greek ceratops). The species epithet (fowleri) honours Denver Fowler, who discovered the holotype, as well as other individuals named after Ojoceratops by the authors of the name.


Ojoraptorsaurus dinosaur

Ojoraptorsaurus is a tiny theropod that lived in North America near the end of the Cretaceous period.

Ojoraptorsaurus is Latin for “lizard-thief from Ojo Alamo.” It derives from the first part of the name of the formation where theropod remains were discovered, as well as the Latin words raptor (“thief”) and saurus (“lizard”). The species name Ojoraptorzaura (boerei) honours Arjan C. Boere, who discovered the holotype.


Oksoko dinosaur

Oksoko is a theropod of the Oviraptoridae family that lived in what is now Mongolia during the Late Cretaceous period. It is famous for housing the nearly entire remains of several Oksoko individuals. Gregory Funston and colleagues named Oksoko in 2020.

The name Oksoko is derived from Altai mythology’s three-headed eagle. This refers to the fact that the holotype was discovered in a deposit that also contained three skulls. In Mongolian, the genre epithet avarsan means “rescued,” referring to the fact that the bones were confiscated from smugglers.


Olorotitan dinosaur
Olorotitan was a Lambeosaurin that lived in today’s Russia during the Late Cretaceous period. Three palaeontologists, Pascal Godefroit of Belgium, Yuri L. Bolotsky of Russia, and Vladimir Alifanov of Belgium, described it in 2003.

The generic name, Olorotitan, means “giant swan” in Latin, which is most likely related to this dinosaur’s extraordinarily long, for a hadrosaurus, “swan” neck. The species name arharensis relates to the Arhara County in Russia, where the dinosaur’s holotype was discovered.


Omeisaurus dinosaur


Omeisaurus is a genus of medium-sized to fairly big sauropoda from the Mamenchisauridae family that existed in today’s China during the Middle Jurassic period. Omeisaurus possessed an unusually long neck, as befitting a member of this family. Scientists named at least ten Oomeisaura species beginning in 1939.

The Emei Shan (Omeishan) mountain range, one of Buddhism’s four sacred mountains, inspired the name Omeisaurus. The second component of the name is derived from the Greek word sauros (“reptile”, “lizard”).


Ondogurvel dinosaur
Ondogurvel is a member of the Parvicursorinae clade that lived in the Late Cretaceous area of what is now Mongolia’s Gobi Desert. Alexander Averianov and Alexey Lopatin described it in 2022.

Ondogurvel is derived from the Mongolian words ondo (“egg”) and gurvel (“lizard”). The genre name honours Vladimir Alifanov, who discovered the dinosaur’s remains in 1999.


Oohkotokia dinosaur

Oohkotokia horneri is an advanced ankylosaurus whose fossils were unearthed in the United States.

The generic name Oohkotokia is derived from the word ooh’kotoka, which is derived from the Blackfoot Indians’ (Siksika) language and means “huge stone” or “rock.” The Latin ending – ia denotes origin, hence the full name Oohkotokia means “child of stone” / “child of rock” and alludes to this dinosaur’s carapace. The species name horneri recognises one of our time’s most recognised palaeontologists, John Horner, for his contribution to the study of dinosaurs from Montana.


Opisthocoelicaudia dinosaur
Opisthocoelicaudia is a Titanosaurus genus that lived in what is now Mongolia during the Late Cretaceous epoch. Some experts believe it is a junior synonym for Nemegtosaurus.

The generic name translates as “back-concave caudal vertebrae,” while the genre name honours Wojciech Skaryski, a Polish palaeontologist who took part in up to six missions to Mongolia.


Orkoraptor dinosaur


Orkoraptor is a medium-sized theropod reported in 2008, with remains discovered in Argentina’s Pari Aike Formation.

The generic name is derived from the words Orr Korr (the name of the river La Leona in the Aoniken tribe’s native language) and Latin. raptor – thief. Coleman Burke, an American amateur geologist and palaeontologist known for his passion for Patagonian extinct fauna, is honoured by the genre’s name.


Ornatops dinosaur
Ornatops is a flat-headed hadrosaurid belonging to the Brachylophosaurini group. McDonald and colleagues described it in 2021.

The name ornatops is derived from the Latin ornatus (“decorative”) and the Greek ops (“face”). It alludes to the shape of the seam between the nasal and frontal bones, which resembles a crest on the skull. The genre descriptor incantatus means “enchanted” and refers to New Mexico’s widespread nickname, “the land of spells.”


Ornithodesmus dinosaur

Ornithodesmus is a poorly characterised dromeosaurid that lived in contemporary England during the early Cretaceous period. As with many other long-known dinosaurs, scientists struggled to identify its remains – Ornithodesmus was initially characterised as a bird, then as a pterosaur for many years.

The name Ornithodesmus is derived from the Greek words ornith (“bird”) and desmos (“link”).

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Written by James

James has always been intrigued by dinosaurs, the universe, technology, and animals. With a Bachelor of Computer Science and years of writing expertise, he joined World Amazing Facts in 2021 as a staff writer.

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