Ornithomimosauria

Deinocheirus ( ) is a genus of large ornithomimosaur that lived during the Late Cretaceous around 70 million years ago. In 1965, a pair of large arms, shoulder girdles, and a few other bones of a new dinosaur were first discovered in the Nemegt Formation of Mongolia. In 1970, this specimen became the holotype of the only species within the genus, Deinocheirus mirificus; the genus name is Greek for "horrible hand". No further remains were discovered for almost fifty years, and its nature remained a mystery. Two more complete specimens were described in 2014, which shed light on many aspects of

Ornithomimosauria ("bird-mimic lizards") are theropod dinosaurs which bore a superficial resemblance to the modern-day ostrich. They were fast, omnivorous or herbivorous dinosaurs from the Cretaceous Period of Laurasia (now Asia, Europe and North America), as well as possibly Africa. The group first appeared in the Early Cretaceous and persisted until the Late Cretaceous. Primitive members of the group include Nqwebasaurus, Pelecanimimus, Shenzhousaurus, Hexing and Deinocheirus, the arms of which reached 2.4 m (8 feet) in length. More advanced species, members of the family Ornithomi

Pelecanimimus (meaning "pelican mimic") is an extinct genus of basal ("primitive") ornithomimosaurian dinosaur from the Early Cretaceous of Spain. It is notable for possessing more teeth than any other member of the Ornithomimosauria (or any other theropod), most of which were toothless.

Harpymimus is a genus of basal ornithomimosaurian theropod dinosaur from the Early Cretaceous Period of what is now Mongolia. Unlike later, more derived ornithomimosaurs, Harpymimus still possessed teeth, although they appear to have been restricted to the dentary of the lower jaw.

Garudimimus (meaning "Garuda mimic") is a genus of ornithomimosaur that lived in Asia during the Late Cretaceous. The genus is known from a single specimen found in 1981 by a Soviet-Mongolian paleontological expedition in the Bayanshiree Formation and formally described in the same year by Rinchen Barsbold; the only species is Garudimimus brevipes. Several interpretations about the anatomical traits of Garudimimus were made in posterior examinations of the specimen, but most of them were criticized during its comprehensive redescription in 2005. Extensive undescribed ornithomimosaur remains at

Nqwebasaurus is a probable ornithomimosaurian theropod from the Early Cretaceous of South Africa. The genus contains a single species, Nqwebasaurus thwazi, representing the oldest known coelurosaur in Africa and the evidence for basal coelurosaurian dinosaurs inhabiting Gondwana since the earliest Cretaceous period.

Beishanlong is a genus of giant ornithomimosaurian theropod dinosaur from the Early Cretaceous of China. It is the second-largest ornithomimosaur discovered, only surpassed by the related Deinocheirus.

Shenzhousaurus (meaning "Shenzhou lizard") is a genus of basal ornithomimosaurian theropod dinosaur from the Lower Cretaceous of China.left|thumb|RestorationThe holotype (NGMC 97–4–002, National Geological Museum of China) was collected from near the bottom (fluvial beds) of the Yixian Formation (Aptian) at the Sihetun fossil site, Beipiao, western Liaoning Province. This specimen consists of a partial skeleton preserved on a sandstone slab in a "death pose," its head above the torso. The distal parts of the hindlimbs, distal portion of the tail, and the forelimbs (except for part of the right

Kinnareemimus (, meaning "Kinnaree mimic", after a figure from Thai folklore) is an extinct genus of ornithomimosaurian theropod dinosaur that was discovered in the Early Cretaceous Sao Khua Formation in what is now Thailand. The genus contains only the type species, K. khonkaenensis. The specific epithet is after Khon Kaen Province, which is in northeastern Thailand, where the remains of the animal were discovered.

Nedcolbertia is a genus of theropod dinosaur from the Early Cretaceous (Valanginian-aged) Cedar Mountain Formation of Utah. The type and only described species so far is N. justinhofmanni, known from at least three partial skeletons.

Arkansaurus (meaning "Arkansas lizard") is an extinct genus of ornithomimosaurian theropod dinosaur that lived during the Aptian and Albian stages of the Early Cretaceous in what is now North America. The type and only species is Arkansaurus fridayi.

Valdoraptor (meaning "Wealden plunderer") is a genus of ornithomimosaurian theropod dinosaur from the Early Cretaceous of England. It is known only from bones of the feet. The holotype, BMNH R2559 (incorrectly given by Owen as BMNH R2556), was found near Cuckfield in layers of the Tunbridge Wells Sand Formation dating from the late Valanginian. The specimen is damaged, lacking parts of the upper and lower ends. It has a conserved length of and an estimated total length of . This genus is paleontologically significant for being the first ornithomimosaur specimen known from England and represent

Deinocheiridae is an extinct family of ornithomimosaurian dinosaurs, living in Asia and North America from the Aptian until the Maastrichtian, with a possible Late Jurassic record in Europe. The family was originally named by Halszka Osmólska and Roniewicz in 1970, including only the type genus Deinocheirus. In a 2014 study by Yuong-Nam Lee and colleagues and published in the journal Nature, it was found that Deinocheiridae was a valid family. Lee et al. found that based on a new phylogenetic analysis including the recently discovered complete skeletons of Deinocheirus, the type genus, as well

Hexing is an extinct genus of basal ornithomimosaurian dinosaur known from the Early Cretaceous of northeastern China. It contains a single species, Hexing qingyi.

Paraxenisaurus (, meaning "strange lizard") is an extinct genus of ornithomimosaurian theropod from the Late Cretaceous Cerro del Pueblo Formation of Coahuila in Mexico. The genus contains a single species, P. normalensis, which is known from a few bones of tail, hips, hands, and feet. The specific epithet was given in honor of the Benemérita Normal School of Coahuila, a teacher training institution, where the fossils were reposited. It is a member of the family Deinocheiridae and is the only member of that clade known from Laramidia.

Tyrannomimus (meaning "tyrant mimic") is an extinct genus of ornithomimosaurian theropod dinosaurs from the Early Cretaceous (Aptian age) Kitadani Formation of Japan. The type species is Tyrannomimus fukuiensis.

Thecocoelurus is a genus of theropod dinosaur from the early Cretaceous period of England. Its type specimen was discovered in strata from the Wessex Formation on the Isle of Wight by the Reverend William Fox, and after his death, it, alongside the rest of his collection, became the property of the British Museum of Natural History. The specimen was named in 1888 by Harry Govier Seeley, who assigned it to the genus Thecospondylus . In 1901, it was reassigned by Baron Franz Nopcsa to Coelurus. In 1923, the specimen was removed from either genus by Friedrich von Huene, who assigned it to a genus