Yutyrannus

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Yutyrannus

Yutyrannus (You-ty-ran-nus) huali, feathered tyrant, lived in Early Cretaceous Liaoning China. It was a medium size non-tyrannosaurid tyrannosauroid and the largest feathered theropod known to date. The other known tyrannosauroids from this time are small predators, so the size indicates that the lineage history is more complex than previously thought.


Content List

1. Genera & species

2. Characteristics

a. Size

b. Behavior

3. History of Discovery

4. Paleoenvironment

5. References


Genera and Species

Classification: Theropoda,‭ ‬Tyrannosauroidea‭‬‬‬‬‬‬‬‬‬‬‬‬

Species: Y. huali.


Characteristics

Yutyrannus was a big, shaggy tyrannosaur with a feathery coat and with three-fingered forearms. The feather covering extended over the body.‭ ‬The feathers themselves were simple in structure and provided insulation. The snout on both sides formed high central "wavy" crests and it had cranial bosses like those found in Alioramus, another Asian tyrannosaur.‬‬‬‬‬‬


Size

Length 9 m (30ft). Weight 1000 – 1300 lbs.


Behavior

The two juveniles found with an adult support the idea that they lived in family groups‭. It was the apex predator, and prey included iguanodontian and sauropod dinosaurs. It would have required a pack to effectively hunt the large adult sauropods.‬‬‬‬‬‬


History of Discovery

Discovery Xu Xing,‭ ‬Wang Kebai,‭ ‬Zhang Ke,‭ ‬Ma Qingju,‭ ‬Xing Lida,‭ ‬Corwin Sullivan,‭ ‬Hu Dongyu,‭ ‬Cheng Shuqing‭ & ‬Wang Shuo‭ ‬-‭ ‬2012. It is known from remains of three individuals,‭ ‬including one adult and two juveniles.‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬


Paleoenvironment

Found in the China, Liaoning region that was cool during the Early Cretaceous – its average temperature was about 10 degrees C. Liaoning was characterized by a series of freshwater lakes surrounded by forests, dominated by trees such as ginkgoes, conifers, cycads, and seed fern trees. Ground cover plants included lycopods, horsetails, ferns, and rare primitive flowering plants.


References

1. Paul, G. (2010). The Princeton Field Guide to Dinosaurs (pp. 6197). Princeton, New Jersey: University Press Princeton

2. Worth, G. (1999). The Dinosaur Encyclopaedia (pp. 644). Scarborough, Western Australia: HyperWorks Reference Software.

3. Yutyrannus. (n.d.). Retrieved December 12, 2014, from http:// www.prehistoric-wildlife.com/species/y/yutyrannus.html

4. Naish, D. (2012, April 4). There are giant feathered tyrannosaurs now… right? | Tetrapod Zoology, Scientific American Blog Network. Retrieved December 14, 2014, from http://blogs.scientificamerican.com/tetrapod-zoology/2012/04/04/giant-feathered-tyrannosaurs/