Name: Siamotyrannus ‭(‬Siamese tyrant‭)‬.
Phonetic: Sy-am-o-ty-ran-nuss.
Named By: E.‭ ‬Buffetaut,‭ ‬V.‭ ‬Suteethorn‭ & ‬H.‭ ‬Tong‭ ‬-‭ ‬1996.
Classification: Chordata,‭ ‬Reptilia,‭ ‬Dinosauria,‭ ‬Saurischia,‭ ‬Carnosauria,‭ ‬Metriacanthosauridae,‭ ‬Metriacanthosaurinae.
Species: S.‭ ‬isanensis‭ (‬type‭)‬.
Diet: Carnivore.
Size: Roughly about‭ ‬6‭ ‬to‭ ‬7‭ ‬meters long.
Known locations: Thailand‭ ‬-‭ ‬Sao Khua Formation.
Time period: Berriasian-Barremian of the Cretaceous.
Fossil representation: Originally‭ ‬based upon a hip as well as some sacral‭ (‬hip‭) ‬and caudal‭ (‬tail‭) ‬vertebrae.‭ ‬A femur and teeth have now also been referred to the genus.

       First named in‭ ‬1996,‭ ‬Siamotyrannus was originally thought to represent‭ ‬one of the earliest known occurrences of a‭ ‬large tyrannosaur,‭ ‬hence the name Siamotyrannus which combines the old name for Thailand,‭ ‬Siam,‭ ‬with the ancient Greek for tyrant.‭ ‬However later studies of‭ ‬Siamotyrannus have come to the conclusion that Siamotyrannus was not a tyrannosaur but another kind of theropod called a metriacanthosaurid.‭ ‬Metriacanthosaurids were more primitive carnosaur theropods,‭ ‬and from these Siamotyrannus can be further classified as a metriacanthosaurine similar to genera such as Sinraptor,‭ ‬Shidaisaurus and of course Metriacanthosaurus.
       Going by the holotype fossils,‭ ‬Siamotyrannus would have been a medium sized predatory dinosaur that may have hunted dinosaurs such as the ornithomimosaur Kinnareemimus and the titanosaur Phuwiangosaurus.‭ ‬Siamotyrannus should not be confused with Siamosaurus,‭ ‬a spinosaurid theropod genus so far only based upon teeth found at the same Fossil Bearing Formation as Siamotyrannus.

Further reading
-‭ ‬The earliest known tyrannosaur from the Lower Cretaceous of Thailand.‭ ‬Nature‭ ‬381:689-691.‭ ‬-‭ ‬E.‭ ‬Buffetaut,‭ ‬V.‭ ‬Suteethorn‭ & ‬H.‭ ‬Tong‭ ‬-‭ ‬1996.
-‭ ‬Early Cretaceous dinosaurs from Thailand and their bearing on the early evolution and biogeographical history of some groups of Cretaceous dinosaurs,‭ ‬by E.‭ ‬Buffetaut‭ & ‬V.‭ ‬Suteethorn.‭ ‬In Lower and Middle Cretaceous Terrestrial Ecosystems.‭ ‬New Mexico Museum of Natural History Bulletin‭ ‬14.‭ ‬p.‭ ‬205-210,‭ ‬Lucas,‭ ‬Kirkland‭ & ‬Estep‭ (‬eds‭)‬.‭ ‬-‭ ‬1998.


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