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Dinosaurs

Adeopapposaurus, meaning "far eating lizard", is a genus of prosauropod dinosaur from the Early Jurassic Period. It was found in the Cañón del Colorado Formation of San Juan, Argentina. It was described in 2009 by Ricardo N. Martínez. The typ...

Adamantisaurus, meaning "Adamantina lizard", is a genus of titanosaurian sauropod dinosaur from the Turonian-Maastrichtian stages of the Late Cretaceous Period (93 to 70 million years ago). It lived in what is now South America. It was discovered in th...

Ouranosaurus, meaning "brave lizard", is a genus of hadrosaurid dinosaur form the Aptian age of the Early Cretaceous Period (110 million years ago). It lived in what is now Africa. Two complete fossils were discovered in the Echkar Formation in Gadoufa...

Othnielosaurus is a genus of ornithiscian dinosaur from the Late Jurassic Period (155 to 148 million years ago). It lived in what is now the western United States. It was formerly assigned to the genus Laosaurus. It is now named in honor of famed paleo...

Othnielia is a genus of hypsilophodont dinosaur from the Oxfordian-Tithonian age of the Late Jurassic Period. Several remains have been discovered in the Morrison Formation in the North American states of Wyoming, Utah and Colorado. But, according to r...

Oryctodromeus, meaning "digging runner", is a genus of ornithopod dinosaur from the Cenomanian age of the Middle Cretaceous Period (95 million years ago). Its remains were found in rocks of the Blackleaf Formation of southeastern Montana. Oryctodro...

Orodromeus is a genus of hypsilophodont dinosaur form the Campanian stage of the Late Cretaceous Period (75 million years ago). It lived in what is now North America in the state of Montana. The type species, O. makelai, was described by Horner and Wei...

Ornithomimus, meaning "bird mimic", is a genus of dinosaur from the Late Cretaceous Period of what is now North America. A partial foot and hand fossil was first discovered in the Maastrichtian Denver Formation. The type species was named O. velox. Mor...

Rhabdodon, meaning "fluted tooth", is a genus of dinosaur from the Late Cretaceous Period (70 million years ago) that lived in what is now Europe. It is unclear whether this animal was an iguanodont or a hypsilophodont. It may be a missing link between...

Rebbachisaurus is a genus of sauropod dinosaur from the Early Cretaceous Period (99 million years ago) that lived in what is now Africa. The discovery of this dinosaur, along with the Rayososaurus, a South American dinosaur nearly identical to Rebbachi...

Raptorex, meaning "robber king", is a genus of tyrannosaurid dinosaur from the Early Cretaceous Period (125 million years ago). It lived in what is now China. It was discovered in the Yixian Formation in northeastern China. The type species, R. kriegst...

Riojasaurus, meaning "Rioja lizard", is a genus of prosauropod dinosaur from the Late Triassic Period. It lived in what is now South America. The initial discovery lacked a skull, but a later discovery of another specimen had a well-preserved skull. Th...

Rinconsaurus is a genus of sauropod dinosaur from the Late Cretaceous Period. It lived in what is now Argentina. It was discovered in 1997 in the Neuquen province of Argentina. It was described by Calvo and Riga in 2003, based on three incomplete skele...

Rinchenia is a genus of oviraptorid dinosaur from the Late Cretaceous Period. It is only known by one species, R. mongoliensis. This specimen was originally named as an Oviraptor in 1986 by Rinchen Barsbold, but after further studies in 1997 by Barsbol...

Montanoceratops, meaning "Montana horned face", is a genus of ceratopsian dinosaur from the Maastrichtian age of the Late Cretaceous Period. It was discovered around 1916 by Barnum Brown at Buffalo Lake, Montana, USA in the St Mary River Formation. It ...

Mononykus, meaning "one claw", is a genus of theropod dinosaur from the Late Cretaceous Period (70 Million Years Ago). It was discovered in the Nemegt Formation in Mongolia. The remains of the first discovered specimen consist of a partial skeleton lac...

Labocania, meaning "red lips"(named for the La Bocana Roja Formation), is a genus of theropod dinosaur from the Campanian age of the Late Cretaceous Period (70 million years ago). It lived in what is now Baja California, Mexico. The type species, L. an...

Kryptops, meaning "covered face", is a genus of theropod dinosaur from the Aptian-Albanian age of the Early Cretaceous Period of what is now Niger. It is known from a partial skeleton found in the western Ténéré Desert in the Elrhaz Formation...

Kritosaurus, meaning "separated lizard" (sometimes misinterpreted as "noble lizard"), is a genus of duckbilled dinosaur from the Late Cretaceous Period (73 million years ago). It lived, possibly, in both North and South America. It was discovered in 19...

Altirhinus, meaning "˜high snout', is a genus of iguanodontian ornithopod dinosaur from the Early Cretaceous Period (125 to 100 million years ago) of Mongolia. It is known from one species (A. kurzanovi), which honors Russian paleontologist Sergei Kur...