page_title: Sinotyrannus
section_title: Classification
hierarchical_section_title: Sinotyrannus / Classification
caption_attribution_description: English: Estimated size of the theropod dinosaur Sinotyrannus.
context_page_description: Sinotyrannus is a genus of large basal proceratosaurid 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, it is the largest known theropod from the Jiufotang Formation. The type species is S. kazuoensis, described by Ji et al., in 2009.
context_section_description: The original description of Sinotyrannus proposed that it could have been the earliest tyrannosaurid due to its large size, but subsequent analyses place it as a proceratosaurid tyrannosauroid. It is considered to be part of a clade containing Juratyrant and Stokesosaurus, as they all reputedly share a narrow preacetabular notch. A 2016 analysis instead placed Juratyrant and Stokesosaurus outside of proceratosauridae and proposed that Sinotyrannus is a sister taxon of Yutyrannus within proceratosauridae.
  Below is a cladogram by Loewen et al. in 2013.
caption: Estimated size of Sinotyrannus, compared to a human.
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