Template:Taxobox Siamotyrannus (meaning "Siamese Tyrant") is a genus of theropod dinosaur from the early Cretaceous (Aptian-Albian). It is known from a partial skeleton which includes part of the pelvis, the sacrum, and a number of vertebrae. The fossils were found in 1993 by Somchai Traimwichanon in the Sao Khua Formation of northeastern Thailand.[1] As evidenced by its name, it was originally thought to be a tyrannosauroid, though due to lacking some of the primary tyrannosauroid synapomorphies that define the clade, its position here is not certain.[2] Some analyses have categorized Siamotyrannus as a primitive carnosaur rather than a basal tyrannosauroid, and it has several features that may determine it to be an allosaurid or a sinraptorid. Little is known of the appearance of the animal, though the known elements suggest it was approximately 6.5 meters long.[3]


  1. Buffetaut, E., Suteethorn, V. and Tong, H. 1996. The earliest known tyrannosaur from the Lower Cretaceous of Thailand. Nature 381: 689-691.
  2. Rauhut, Oliver W. M. Special Papers in Palaeontology: The Interrelationships and Evolution of Basal Theropod Dinosaurs (No. 69). The Palaeontological Association: 2003
  3. Holtz, Thomas R. et al. (2004). "Basal Tetanurae." In: Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. Pp. 101. ISBN 0-520-24209-2.

Template:PortalTemplate:Theropod-stub es:Siamotyrannus fr:Siamotyrannus ja:シャモティラヌス pl:Syjamotyran pt:Siamotyrannus fi:Siamotyrannus sv:Siamotyrannus th:สยามโมไทรันนัส อีสานเอนซิส vo:Siamotyrannus zh:暹罗暴龙 &nbsp