Segnosaurus
| Segnosaurus | ||||||||||||
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Hypothetical reconstruction of Segnosaurus |
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| Temporal occurrence | ||||||||||||
| Upper Cretaceous ( Cenomanium to Turonium ) | ||||||||||||
| 100.5 to 89.7 million years | ||||||||||||
| Locations | ||||||||||||
| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Segnosaurus | ||||||||||||
| Pearl , 1979 |
Segnosaurus (Eng. "Slow lizard") is a theropod dinosaur from the group of Therizinosauridae . He lived during the early Upper Cretaceous ( Cenomanium to Turonium ). The only known species is Segnosaurus galbinensis .
The genus is known from fragmentary skeletal parts of three specimens found in southern Mongolia and Inner Mongolia . These include parts of the vertebrae, lower jaw, pelvis, hind legs and incompletely preserved forelegs. A skull was not found.
features
The cervical vertebrae were large, elongated and had low neural processes, and the sacrum , reinforced by ossified ligaments , had six ribs. The humerus was less massive than other therizinosaurs. Like all therizinosaurs, Segnosaurus had strong arms and three fingers on the forehand, with the phalangeal formula 2-3-4. The shinbone reached more than 80% the length of the femur . Segnosaurus' foot was short and wide, the fifth toe was missing. Each branch of the lower jaw of Segnosaurus had 24 sharp-pointed teeth.
Segnosaurus was likely four to eight meters long and was a clumsy, biped- walking dinosaur.
literature
- James M. Clark , Teresa Maryanska , Rinchen Barsbold : Therizinosauroidea. In: David B. Weishampel , Peter Dodson , Halszka Osmólska (eds.): The Dinosauria . 2nd edition. University of California Press, Berkeley CA et al. 2004, ISBN 0-520-24209-2 , pp. 151-164.
Web links
Individual evidence
- ^ Dougal Dixon : The World Encyclopedia of Dinosaurs & Prehistoric Creatures. Lorenz Books, London 2011, ISBN 978-0-7548-1730-7 , p. 312.