Sinotyrannus

Sinotyrannus
Sinotyrannus
Temporal occurrence
Lower Cretaceous (Barremium)
130.7 to 126.3 million years
Locations
China ( Jiufotang Formation )
Systematics
Saurischia (lizard basin dinosaur) Theropoda Coelurosauria Tyrannosauroidea Proceratosauridae Sinotyrannus
Scientific name
Sinotyrannus
Ji et al. 2009
species
Sinotyrannus kazuoensis

Sinotyrannus ("Chinese tyrant") was a genus of large tyrannosauroid dinosaurs from the Lower Cretaceous of China . The only known species, Sinotyrannus kazuoensis , was discovered in 2009 by Ji et al. first described.

features

The holotype of Sinotyrannus has only survived in fragments. The anterior part of the skull and the lower jaw , three vertebrae , some ribs , an incomplete iliac bone , parts of the hand and some other incomplete bones have survived. The entire skull was probably about one meter long; Ji et al. Estimate the length of the entire animal . to nine to ten meters.

Conservatively valued Sinotyrannus compared to a human being

This made Sinotyrannus significantly larger than other proceratosaurids and about as long as the later tyrannosaurids of the Upper Cretaceous. Other estimates, however, amount to about six meters, with which Sinotyrannus nevertheless towered over other known proceratosaurids.

Systematics

The first descriptors Ji et al. expressed the possibility that Sinotyrannus was an early representative of the Tyrannosauridae. More recent studies, however, assign it to the Proceratosauridae, a family of mostly small to medium-sized predatory dinosaurs within the superfamily Tyrannosauroidea.

Abbreviated cladogram according to Loewen et al. (2013):

Proceratosauridae	Kileskus     Guanlong     Proceratosaurus     Sinotyrannus     Juratyrant     Stokesosaurus

Individual evidence

1. ↑ Data sheet of the location in the Palaeobiology Database
2. ^ Qiang Ji, Shu-an Ji, Li-jun Zhang: First large tyrannosauroid theropod from the Early Cretaceous Jehol Biota in northeastern China. In: Geological Bulletin of China. Vol. 28, No. 10, 2009, ISSN  1671-2552 , pp. 1369–1374, online (PDF; 938.95 kB) ( Memento of the original from February 22, 2014 in the Internet Archive ) Info: The archive link was inserted automatically and not yet checked. Please check the original and archive link according to the instructions and then remove this notice. . 
3. ↑ Thomas R. Holtz Jr .: Genus List. Update 2012 . to: Thomas R. Holtz Jr .: Dinosaurs. The most complete, up-to-date Encyclopedia for Dinosaur Lovers of all Ages. Random House, New York NY 2007, ISBN 978-0-375-82419-7 (PDF; 687.15 kB).
4. ↑ Mark A. Loewen, Randall B. Irmis, Joseph JW Sertich, Philip J. Currie , Scott D. Sampson: Tyrant Dinosaur Evolution Tracks the Rise and Fall of Late Cretaceous Oceans. In: PLoS ONE . Vol. 8, No. 11, 2013, e79420, doi : 10.1371 / journal.pone.0079420 .