Nyasasaurus Nyasasaurus (NYE-ass-uh-SAWR-us; “Lake Nyasa lizard”) is a genus of early dinosauriform reptile, possibly one of the earliest dinosaurs, that lived during the Middle Triassic period, approximately 245 to 243 million years ago. Its fossils were discovered in Tanzania, near Lake Nyasa (now Lake Malawi), which gives the creature its name. Although the first remains […]
Oceanotitan: Profile of a Prehistoric Giant Oceanotitan Oceanotitan (Oh-see-AN-oh-tie-tan; “Ocean titan”) is a genus of titanosauriform sauropod dinosaur that lived during the Late Jurassic period, specifically the latest Kimmeridgian age, around 152 million years ago. Its fossils were discovered in the Lourinhã Formation at Porto Dinheiro, Portugal, near the Atlantic coast, which inspired its name.
Ohmdenosaurus: Profile of a Prehistoric Giant Ohmdenosaurus Ohmdenosaurus (OHM-den-o-SAWR-us; “Ohmden lizard”) is a genus of sauropod dinosaur that lived during the Early Jurassic period, approximately 183 to 182 million years ago. Its fossils were discovered in marine shales near Ohmden in Baden-Württemberg, Germany, the place for which it is named. Ohmdenosaurus was first described by
Ojoceratops: Profile of a Prehistoric Giant Ojoceratops Ojoceratops (OH-ho-SER-uh-tops; “Horned face from the Ojo Alamo Formation”) is a genus of chasmosaurine ceratopsid dinosaur that lived during the Late Cretaceous period, around 69 to 68 million years ago, in what is now New Mexico, USA. The name refers to the Ojo Alamo Formation, the geological layer
Ojoraptorsaurus: Profile of a Prehistoric Giant Ojoraptorsaurus Ojoraptorsaurus (OH-joe-rap-tor-SAWR-us; “Plunderer lizard from the Ojo Alamo Formation”) is a genus of caenagnathid oviraptorosaur dinosaur that lived during the Late Cretaceous period, approximately 69 million years ago. Its fossils were discovered in the Ojo Alamo Formation of New Mexico, USA. The name Ojoraptorsaurus refers to this geological
Oligosaurus Oligosaurus (OH-lih-go-SAWR-us; “Scanty Lizard”) is a genus of ornithischian dinosaur that lived during the Late Cretaceous period, approximately 100 to 94 million years ago, in what is now England. The name reflects the very limited and fragmentary nature of the fossils discovered. Oligosaurus was first named by the British paleontologist Harry Govier Seeley in
Olorotitan: Profile of a Prehistoric Giant Olorotitan Olorotitan (Oh-LOR-oh-TY-tan; “Giant Swan”) is a genus of lambeosaurine hadrosaurid dinosaur that lived during the Late Cretaceous period, approximately 72 to 66 million years ago, in what is now the Amur Region of Far Eastern Russia. The name Olorotitan combines the Greek word “oloros” (swan), chosen for its
Omeisaurus: Profile of a Prehistoric Giant Omeisaurus Omeisaurus (OH-may-SAWR-us; “Omei lizard”) is a genus of sauropod dinosaur that roamed what is now China during the Middle Jurassic period, approximately 170 to 160 million years ago. The name Omeisaurus refers to Mount Emei in Sichuan province, China, where the first fossils of this long-necked giant were
Omosaurus: Profile of a Prehistoric Giant Omosaurus Omosaurus (OH-mo-SAWR-us; “humerus lizard” or “upper arm lizard”) is a genus of stegosaurian dinosaur that lived during the Late Jurassic period, around 157 to 152 million years ago. Its fossils have been primarily found in England, with possible remains from France and Portugal. The name Omosaurus was given
Onychosaurus Onychosaurus (ON-ih-koh-SAWR-us; “Claw lizard”) is a genus of nodosaurid ankylosaur, a type of plant-eating armored dinosaur, that lived during the Late Cretaceous period, specifically the Turonian stage, about 92 to 89 million years ago. Fossil remains thought to belong to Onychosaurus have been discovered in what is now Uzbekistan in Central Asia. The name
