Stokesosaurus

Name: Stokesosaurus ‭(‬Stoke's lizard‭)‬.
Phonetic: Stokes-oh-sore-us.
Named By: Madsen‭ ‬-‭ ‬1974.‭
Classification: Chordata,‭ ‬Reptilia,‭ ‬Dinosauria,‭ ‬Saurischia,‭ ‬Theropoda,‭ ‬Tyrannosauroidea.
Species: S.‭ ‬clevelandi‭ (‬type‭)‬.
Diet: Carnivore.
Size: Estimated‭ ‬3‭ ‬-‭ ‬4‭ ‬meters long.
Known locations: USA,‭ ‬Utah‭ ‬-‭ ‬Morrison Formation.
Time period: Kimmeridgian of the Jurassic.
Fossil representation: Several specimens of partial remains.

       Dating back around one-hundred and fifty-two million years ago,‭ ‬Stokesosaurus is one of the earliest representatives of the tyrannosaur lineage,‭ ‬being only slightly later than Guanlong.‭ ‬At up to four meters long,‭ ‬Stokesosaurus resembled the juvenile forms of later tyrannosarids,‭ ‬and was a fleet footed predator relying upon speed to catch prey.‭ ‬Stokesosaurus probably remained at these smaller sizes because other larger predators such as Allosaurus were dominant at the time.‭ ‬By staying smaller and faster,‭ ‬Stokesosaurus could focus upon hunting prey that was too fast and nimble for Allosaurus to bother with.
       The description of Aviatyrannis in‭ ‬2003‭ ‬was initially taken as representing another early tyrannosaurid dinosaur that was similar to Stokesosaurus.‭ ‬However some palaeontologists have pointed out the similarity between the scant partial remains of Aviatyrannis and the better known Stokesosaurus,‭ ‬as such the possibility that Aviatyrannis is a junior synonym to Stokesosaurus is recognised by most.‭ ‬Another potential synonym for Stokesosaurus is Tanycolagreus.‭ ‬Again however,‭ ‬the lack of matching fossil material‭ (‬particularly the ilium‭) ‬makes it difficult to be certain.
       One former species of Stokesosaurus, S. langhami from England has now been described as a a new genus, Juratyrant.

Further reading
- A new theropod dinosaur from the Upper Jurassic of Utah. - Journal of Paleontology 48(1):27-31. - J. H. Madsen Jr - 1974.
- An unusual braincase (?Stokesosaurus clevelandi) from the Cleveland-Lloyd Dinosaur Quarry, Utah (Morrison Formation; Late Jurassic). - Journal of Vertebrate Paleontology 18 (1): 115–125. - D. Chure & J. Madsen - 1998.
- An ilium of a juvenile Stokesosaurus (Dinosauria, Theropoda) from the Morrison Formation (Upper Jurassic: Kimmeridgian), Meade County, South Dakota. - Brigham Young University Geology Studies 45: 5–10. - J. Foster & D. Chure - 2000.
- New small theropod from the Upper Jurassic Morrison Formation of Wyoming. - In The Carnivorous Dinosaurs. Indiana University Press, Bloomington pp. 23-48, by K. Carpenter - K. Carpenter, C.A. Miles & K.C. Cloward - 2005.



----------------------------------------------------------------------------

Random favourites