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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.
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.
The humerus (upper arm) was exceptionally robust and flexible with wide lower ends as seen on the humeri of the therizinosaurids Nothronychus and Therizinosaurus. Not only that but the biceps muscle was prominently well-developed in Therizinosaurus. [2] [12] In Segnosaurus, the deltopectoral crest (deltoid muscle attachment) was strongly built. [3]
May have been a herbivore or omnivore due to its heterodont dentition Fulengia: 1977 Lufeng Formation (Early Jurassic, Hettangian to Toarcian) China: May have been a juvenile Lufengosaurus: Fushanosaurus: 2019 Shishugou Formation (Late Jurassic, Oxfordian) China: Known from a single femur of immense size Fusuisaurus: 2006
Barsbold proposed the Deinocheirosauria and included Therizinosaurus as a member. [5] In another paper during the same year, Barsbold referred a shoulder and forearm found in the same strata as the Therizinosaurus type specimen to that genus because of the resemblance between the specimens claws. He observed that the anatomy of the arm and ...
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Mounted skeletons of Tyrannosaurus (left) and Apatosaurus (right) at the AMNH. Dinosaurs are a diverse group of reptiles of the clade Dinosauria. They first appeared during the Triassic period, between 243 and 233.23 million years ago, although the exact origin and timing of the evolution of dinosaurs is the subject of active research.