Extinct genus of therizinosaurid dinosaur from late Cretaceous
Segnosaurus
Temporal range: Late Cretaceous, 90 Ma
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S
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C
P
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Diagram showing known remains
Scientific classification
Domain:
Eukaryota
Kingdom:
Animalia
Phylum:
Chordata
Clade:
Dinosauria
Clade:
Saurischia
Clade:
Theropoda
Family:
†Therizinosauridae
Genus:
†Segnosaurus Perle, 1979
Species:
†S. galbinensis
Binomial name
†Segnosaurus galbinensis
Perle, 1979
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. Multiple incomplete but well-preserved specimens were discovered in the Gobi Desert in the 1970s, and in 1979 the genus and species Segnosaurus galbinensis were named. The generic name Segnosaurus means "slow lizard" and the specific name galbinensis refers to the Galbin region. The known material of this dinosaur includes the lower jaw, neck and tail vertebrae, the pelvis, shoulder girdle, and limb bones. Parts of the specimens have gone missing or become damaged since they were collected.
Segnosaurus was a large-bodied therizinosaur that is estimated to have been about 6–7 m (20–23 ft) long and to have weighed about 1.3 t (1.4 short tons). It would have been bipedal, with the trunk of its body tilted upwards. The head was small with a beak at the tip of the jaws, and the neck was long and slender. The lower jaw was down-turned at the front and the teeth were distinct in having additional denticles as well as third cutting edges in some of the hindmost teeth. The forelimbs were robust and had three fingers which bore large claws, and the feet had four toes supporting the foot—apart from therizinosaurs, all theropods had three-toed feet. 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.
The affinities of Segnosaurus were originally obscure and it received its own theropod family, Segnosauridae, and later when related genera were identified, an infraorder, Segnosauria. Alternative classification schemes were proposed until more complete relatives were described in the 1990s, which confirmed them as theropods. The new fossils also showed Segnosauridae was a junior synonym of the earlier named family Therizinosauridae. Segnosaurus and its relatives are thought to have been slow-moving animals that, as indicated by their unusual features, were mainly herbivorous, whereas most other theropod groups were carnivorous. Therizinosaurs probably used their long forelimbs, long necks, and beaks when browsing, and large guts for processing food. Segnosaurus is known from the Bayan Shireh Formation, where it lived alongside the fellow therizinosaurs Erlikosaurus and Enigmosaurus; these related genera were probably niche partitioned.
the 1970s, and in 1979 the genus and species Segnosaurus galbinensis were named. The generic name Segnosaurus means "slow lizard" and the specific name galbinensis...
Erlikosaurus and Segnosaurus were so similar in other respects, while the pelvis of Enigmosaurus was very different from that of Segnosaurus. Barsbold found...
ground sloths. The largest genera of the group are Therizinosaurus and Segnosaurus, which were about 10 m (33 ft) and 7 m (23 ft) long, respectively. The...
did not closely resemble that of the specimen in Segnosaurus as would be expected for the Segnosaurus-like remains of Erlikosaurus, and there is a considerable...
(turtles order) to be unlikely, and hypothesized Therizinosaurus and Segnosaurus—at the time of this description regarded as a theropod dinosaur—to be...
Lucky the Dinosaur is an approximately 8-foot-tall (2.4 m) green Segnosaurus free roaming Audio-Animatronics figure which pulls a flower-covered cart...
and named Segnosaurus also erecting the Segnosauridae to contain this strange taxon. After the findings of Nanshiungosaurus and Segnosaurus, more complete...
Enigmosaurus, Erlikosaurus and Segnosaurus. The holotype location, Khara Khutul, has also yielded the contemporary Segnosaurus and an unnamed velociraptorine...
other paleofauna such as the medium-sized theropods Erlikosaurus and Segnosaurus, Garudimimus, and possibly Alectrosaurus; the heavy-built ankylosaurs...
ornithomimid ornithomimosaurs, diplodocoid and titanosaur sauropods, Segnosaurus, and caenagnathids, was found to be in the former category. These researchers...
therizinosaurs to be theropods. In 1979, Altangerel Perle named the new species Segnosaurus galbinensis, which although he recognized was an unusual theropod, he...
created by Disney's Imagineers. An approximately 8-foot-tall (2.4 m) green Segnosaurus figure, it pulls a flower-covered cart and is led by Chandler the Dinosaur...
ornithomimosaurs, Deinocheirus, diplodocoid and titanosaur sauropods, Segnosaurus, and caenagnathids, were found to be in the former category. These researchers...
and weighing about 27 kg (60 lb) in contrast to the advanced and giant Segnosaurus or Therizinosaurus. The necks of Beipiaosaurus were shorter than in most...
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