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In 2014, Lautenschlager tested the function of various therizinosaur hand claws—including Therizinosaurus—through digital simulations. Three different functional scenarios were simulated for each claw morphology with a force of 400 N applied in each scenario: scratch/digging; hook-and-pull; and piercing.
The claws were unusually large, approximately 1 m (3.3 ft) long if restored, very straight and flattened. Maleev considered that the claws belonged to a giant marine turtle and named the new genus and species Therizinosaurus cheloniformis , also erecting the Therizinosauridae to include the new species.
Around 2005 partial therizinosaur material was collected from the Laijia Formation and later used to represent "Tiantaiosaurus sifengensis" (alternatively "Tiantaisaurus"), which is a currently unpuslihed and informal therizinosaur taxon. Qian and team in 2012 noted that a whole manuscript describing the taxon was written in 2007 but never ...
An excavation of the area by an MNA crew revealed more of the skeleton, and the scientists found that it was a therizinosaur, and the first example of that group to be found in the Americas. All previous therizinosaur fossils had come from China and Mongolia. [2] Between both species, N. graffami is the most complete but lacks the skull. [4] [5]
Beipiaosaurus was a small therizinosaur, measuring 2.2 m (7.2 ft) in length, and before the discovery of Yutyrannus they were the largest dinosaurs known from direct evidence to be feathered. [1] It is estimated to have weighed about 27 kg (60 lb) based on femur length. [7]
In 2022, Kobayashi et al. described Paralitherizinosaurus as a new genus and species of therizinosaurid making it the third therizinosaur found in Japan. [3] This taxon represents the first named therizinosaur from Japan, with two other unnamed specimens being known.
It represents the second therizinosaur taxon from this formation (alongside Enigmosaurus and Segnosaurus) with the most complete skull among members of this peculiar family of dinosaurs. In contrast to most therizinosaurids, Erlikosaurus was a small member reaching nearly 3.4 m (11 ft) in length and 150 to 250 kg (330 to 550 lb) in mass.
Falcarius (meaning "sickle cutter") is a genus of primitive therizinosaur dinosaur that lived during the Early Cretaceous period in what is now North America. Its remains were first collected in the Cedar Mountain Formation in 1999, with subsequent findings made during the 2000s. The genus is known from multiple specimens ranging from immature ...