Yutyrannus was pretty big for its geological age weighing in at around
1400kg, based on an estimate using femoral length (a standard proxy for
dinosaurian body size estimates). As such, it represents the largest known
dinosaur species to possess feather-like structures (‘protofeathers’, or
elongate filaments), and is around 40 times larger than the previous contender,
Beipiaosaurus. Three specimens are currently know of Yutyrannus, representing an
adult with two juveniles, based on overall size and morphometrics, purportedly
occurring together. If genuinely found together, this could be either construed
as evidence for social behaviour, such as hunting, extensive parental care, or
just be a chance occurrence with specimens washed together post-mortem.
Xu et al., 2012
Meaning of the generic name
Derived from ‘yu’ (Mandarin for ‘feathers’) ‘tyrannus’ (Latin for ‘king’ or ‘tyrant’)
Meaning of the specific name
‘huali’ means ‘beautiful’ in Mandarin, referring to the beauty of the plumage of this animal
Body Length: 9 m (30 ft). Skull length: estimated 905 mm
Holotype: ZCDM (Zhucheng Dinosaur Museum, Shandong) V5000, a semi-articulated, nearly complete skeleton.
Paratypes: ZCDM V5001, a nearly complete, articulated skeleton; and ELDM (Erlianhaote Dinosaur Museum, Inner Mongolia) V1001, an articulated skeleton missing the tail.
Age and Distribution
Horizon: Lower Cretaceous, Yixian Formation (?Aptian)
Locality: Batuyingzi, Beipiao, Liaoning Province, China;
Dinosauria Saurischia Theropoda Tyrannosauroidea
Xu, X., Wang, K., Zhang, K., Ma, Q., Xing, L., Sullivan, C., Hu, D., Cheng, S., and Wang, S. (2012). "A gigantic feathered dinosaur from the Lower Cretaceous of China." Nature, 484: 92-95.
Skull and mandible of ELDM V1001 from Xu et al., 2012