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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.
Since little was known of Therizinosaurus at the time of the original description, Maleev thought PIN 551-483 belonged to a large, 4.5 m (15 ft) long turtle-like reptile that relied on its giant hand claws to harvest seaweed. [1] Holotype unguals PIN 551–483 at the Moscow Paleontological Museum; note left ungual cast
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.
Deinocheirus and Therizinosaurus possessed the longest forelimbs known for any bipedal dinosaurs. [19] The holotype forelimbs measure 2.4 m (7.9 ft) long—the humerus (upper arm bone) is 93.8 cm (36.9 in), the ulna 68.8 cm (27.1 in), and the hand is 77 cm (30 in)—including the 19.6-centimetre-long (7.7 in) recurved claws.
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
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. [1]
SMM P60.2.1, P62.1.1, P60.5.1, P63.11.1, P63.2.1, P60.6.1 (composite) Science Museum of Minnesota: Triceratops: Late Cretaceous (Maastrichtian, 68-66 million years ago) Named after the dragon in both Norse mythology and Richard Wagner's opera Siegfried; coined by his granddaughter. [28] Fafnir the Triceratops: Getaway Trike MOR 1120 Museum of ...
The holotype specimen represents a not fully-grown individual based on one unfused caudal vertebra, and therefore its adult size may be larger than the contemporary Neimongosaurus. [1] It was a small to medium-sized therizinosaur with an estimated length from 2.6 to 4 m (8.5 to 13.1 ft) and a weight of 91 to 400 kg (201 to 882 lb).