Temporal range: Late Jurassic
Stokesosaurus clevelandi by teratophoneus-d55xrdw.jpg
An artist's interpretation of Stokesosaurus clevelandi
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Order: Saurischia
Suborder: Theropoda
Family: Proceratosauridae
Genus: Stokesosaurus
Madsen, 1974
Species: S. clevelandi
Binomial name
Stokesosaurus clevelandi
Madsen, 1974

Stokesosaurus is a Primitive Tyrannosauroid from late Jurassic Utah, USA. It is one of the oldest known Tyrannosauroids.  It is 13.1 ft (4m) long and weighed about 1000 lbs.

Discovery History

From 1960 onwards Utah geologist William Lee Stokes and his assistant James H. Madsen excavated thousands of disarticulated Allosaurus bones at the Cleveland-Lloyd Dinosaur Quarry in Emery County, Utah. During the early 1970s Madsen began to catalogue these finds in detail, discovering that some remains represented species new to science. In 1974 Madsen named and described the type species Stokesosaurus clevelandi. Its generic name honours Stokes. The specific name refers to the town of Cleveland, Utah.


In 1974 Madsen assigned Stokesosaurus to the Tyrannosauridae.[1] However, modern cladistic analyses indicate a more basal position. In 2012 the study by Brusatte and Benson recovered Stokesosaurus as a basal member of the Tyrannosauroidea, and closely related to Eotyrannus and Juratyrant.

In the Media



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