Segnosaurus

Segnosaurus is a genus of therizinosaurid dinosaur that lived in what is now southeastern Mongolia during the Late Cretaceous. It was a large-bodied therizosaurus that is estimated to have been about 6–7 m long and to have weighed about 1. 3 t. It would have been bipedal, with the trunk of its body tilted upwards. The front of the pelvis was adapted to support the enlarged belly. It is the only theropod dinosaur in the world to date to be classified as a theropods.

About Segnosaurus in brief

Segnosaurus is a genus of therizinosaurid dinosaur that lived in what is now southeastern Mongolia during the Late Cretaceous, about 102–86 million years ago. Segnosaurus was a large-bodied therizosaurus that is estimated to have been about 6–7 m long and to have weighed about 1. 3 t. It would have been bipedal, with the trunk of its body tilted upwards. The front of the pelvis was adapted to support the enlarged belly. The pubic bone was turned backwards, a feature that is only seen in birds and the dinosaurs most closely related to them. It lived alongside the fellow therizinosaurs Erlikosaurus and Enigmosaurus; these related genera were probably niche partitioned. The generic name is derived from the Latin word segnis and the Ancient Greek sauros. The specific name refers to the Galbin region of the Gobi Desert. The holotype specimen from the Amtgay locality is housed at the Mongolian Academy of Sciences under the specimen number IGM 10080. It includes the mandible, an incomplete humerus, a complete radius and ulna, phalanges of the fingers, a forelimb ungual, an almost-complete pelvis, an incomplete right femur, six sacral vertebrae, ten caudal vertebraes from the front of a tail, fifteen from the hindmost part of the tail, the first gastral rib, and the dorsal ribs. Two more specimens were designated as paratype specimens from the Khara-Khutul locality.

In 1980, the paleontologist Rinchen Barshen assigned another specimen to Segnosauria tinchen. In 1979 the genus and species Segnosaurus galbinensis were named by Altangerel Perle. It is the only theropod dinosaur in the world to date to be classified as a theropods. The fossil remains were found in the Bayan Shireh Formation in southeastern Mongolia in the 1970s and 1980s. The known material of this dinosaur includes the lower jaw, neck and tail vertebraed, the pelvis, shoulder girdle, and limb bones. It was probably herbivorous, as indicated by their unusual features, but most other theropOD groups were carnivorous. It had long forelimbs, long necks, and beaks when browsing, and large guts for processing food. It also had three fingers which bore large claws, and feet had four toes supporting the foot. The affinities of Segnosaurs were originally obscure and it received its own theropody family, SegnOSauridae. More complete relatives were described in the 1990s, which confirmed them as theropoder dinosaurs. The new fossils also showed Segnoosauridae was a junior synonym of the earlier named family Therizinosauridae. The fossils were scientifically described in 1979 by the Paleontologist Altange Rel Perle, who named the new genus and Species Segnaurus galbiensis.

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