Sinotyrannus

Sinotyrannus kazuoensis
Temporal range: Early Cretaceous, 120 Ma
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Diagram of known fossil remains in grey
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Clade: Dinosauria
Order: Saurischia
Suborder: Theropoda
Family: †Proceratosauridae
Genus: †Sinotyrannus
Ji et al., 2009
Species: †S. kazuoensis
Binomial name
Sinotyrannus kazuoensis
Ji et al., 2009

Sinotyrannus (meaning "Chinese tyrant") is a genus of large basal proceratosaurid[1] dinosaur, a relative of tyrannosaurids which flourished in North America and Asia during the Jurassic and early Cretaceous periods. Sinotyrannus is known from a single incomplete fossil specimen including a partial skull, from the Early Cretaceous Jiufotang Formation of Liaoning, China. Though it is not much younger than primitive tyrannosauroids such as Dilong, it is similar in size to later forms such as Tyrannosaurus. It was much larger than contemporary tyrannosauroids; reaching a total estimated length of 9–10 m (30–33 ft), it is the largest known theropod from the Jiufotang Formation. The type species is S. kazuoensis, described by Ji et al., in 2009.[2]

Classification

Sinotyrannus is a basal proceratosaurid tyrannosauroid. It is considered to be part of a clade containing Juratyrant and Stokesosaurus.[3]

Below is a cladogram by Loewen et al. in 2013.[3]

Estimated size of Sinotyrannus, compared to a human.
Tyrannosauroidea
Proceratosauridae


Proceratosaurus bradleyi

Kileskus aristotocus

Guanlong wucaii

Sinotyrannus kazuoensis

Juratyrant langhami

Stokesosaurus clevelandi

Dilong paradoxus

Eotyrannus lengi

Bagaraatan ostromi

Raptorex kriegsteini

Dryptosaurus aquilunguis


Alectrosaurus olseni

Xiongguanlong baimoensis

Appalachiosaurus montgomeriensis


Alioramus altai

Alioramus remotus

Tyrannosauridae











See also

References

  1. ↑ Brusatte, S. L.; Norell, M. A.; Carr, T. D.; Erickson, G. M.; Hutchinson, J. R.; Balanoff, A. M.; Bever, G. S.; Choiniere, J. N.; et al. (2010). "Tyrannosaur paleobiology: new research on ancient exemplar organisms". Science. 329 (5998): 1481–1485. doi:10.1126/science.1193304. PMID 20847260.
  2. ↑ Ji, Q.; Ji, S.-A.; Zhang, L.-J. (2009). "First large tyrannosauroid theropod from the Early Cretaceous Jehol Biota in northeastern China" (PDF). Geological Bulletin of China. 28 (10): 1369–1374.
  3. 1 2 Loewen, M.A.; Irmis, R.B.; Sertich, J.J.W.; Currie, P. J.; Sampson, S. D. (2013). Evans, David C, ed. "Tyrant Dinosaur Evolution Tracks the Rise and Fall of Late Cretaceous Oceans". PLoS ONE. 8 (11): e79420. doi:10.1371/journal.pone.0079420.
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