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Therizinosaurus (/ ˌ θ ɛ r ə ˌ z ɪ n oʊ ˈ s ɔːr ə s / ⓘ; meaning 'scythe lizard') is a genus of very large therizinosaurid dinosaurs that lived in Asia during the Late Cretaceous period in what is now the Nemegt Formation around 70 million years ago. It contains a single species, Therizinosaurus cheloniformis.
Therizinosauridae was named in 1954 by paleontologist Evgeny Maleev after the large, claw-bearing unguals of the type species Therizinosaurus cheloniformis. Therizinosaurids were generally large and very robustly built animals that had a near convergent body plan with the more recent (and also extinct) ground sloths .
Nothronychus (meaning "slothful claw") is a genus of therizinosaurid theropod dinosaurs that lived in North America during the Late Cretaceous period. The type species, Nothronychus mckinleyi, was described by James Kirkland and Douglas G. Wolfe in 2001.
Forelimbs of Therizinosaurus, specimen IGM 100/15 displayed at Nagoya City Science Museum. Therizinosaurs were long considered an enigmatic group, whose mosaic of features resembling those of various different dinosaur groups, and scarcity of their fossils, led to controversy over their evolutionary relationships for decades after their initial discovery.
Senter and James suggested the ecological niches for Therizinosaurus and Deinocheirus were characterized by high-browsing life styles. Therizinosaurus was found to be among the tallest dinosaurs in the Nemegt Formation. They also calculated that an average Therizinosaurus may have had 3 m (9.8 ft) long hindlimbs. [54] 2011
A euornithine sometimes confused with Rahonavis, a confusion that has led to the common misconception that Vorona had a dromaeosaur-like sickle claw on each foot. †Yungavolucris †Yungavolucris brevipedalis; 70.6–66 Ma Lecho Formation, Salta Province, Argentina A small, little-known euenantiornithine that may have been adapted for swimming.
Fossil localities in Mongolia. Locality of Erlikosaurus in Bayshin Tsav, at Area C. The holotype specimen, MPC-D 100/111, was found in layers from the Bayshin Tsav locality on the Bayan Shireh Formation, consisting of an exceptionally well preserved skull, a virtually complete right pes only lacking the proximal end of metatarsals II, III and IV, and an almost complete left humerus.
Therizinosaurs, also known as segnosaurs, were theropod dinosaurs and members of the clade Therizinosauria. For many years after their discovery, the exact placing of this group within dinosaurs was somewhat speculative.