Name: Tatisaurus.
Phonetic: Ta-ti-sor-us.
Named By: D.‭ ‬J.‭ ‬Simmons‭ ‬-‭ ‬1965.
Classification: Chordata,‭ ‬Reptilia,‭ ‬Dinosauria,‭ ‬Ornithischia,‭ ‬Thyreophora.
Species: T.‭ ‬oehleri‭ (‬type‭)‬.
Diet: Herbviore.
Size:‭ ‬Unknown due to lack of fossil remains.
Known locations: China‭ ‬-‭ ‬Lufeng Formation.
Time period: Sinemurian of the Jurassic.
Fossil representation: Partial left dentary‭ (‬lower jaw‭) ‬with teeth.

       Tatisaurus is one of those dinosaurs that has a lot of people forming lots of different opinions about what exactly it is.‭ ‬The person who first described the type fossil,‭ ‬D.‭ ‬J.‭ ‬Simmons first proposed that it belonged to a heterodontosaurid dinosaur and then later to a dinosaur similar to Scelidosaurus,‭ ‬a Thyreophoran that currently rests within the Ankylosauria group.‭ ‬In the‭ ‬1990s the palaeontologist Dong Zhiming considered the partial jaw of Tatisaurus to actually come from a stegosaur‭ (‬the other main type of thyreophoran dinosaur‭) ‬based upon a similarity to the genus Huayangosaurus.‭ ‬But after this another‭ ‬palaeontologist‭ ‬called Spencer Lucas suggested that Tatisaurus was actually the same animal as Scelidosaurus.‭ ‬Palaeontologists after this however have been reluctant to classify Tatisaurus as any specific dinosaur and instead prefer to label Tatisaurus as‭ ‬a probably primitive thyreophoran dinosaur,‭ ‬but also one that is dubious because of the severe lack of fossils that are known for this dinosaur.

Further reading
-‭ ‬The non-therapsid reptiles of the Lufeng Basin,‭ ‬Yunnan,‭ ‬China.‭ ‬-‭ ‬Fieldiana:‭ ‬Geology‭ ‬15‭(‬1‭)‬:1-93.‭ ‬-‭ ‬D.‭ ‬J.‭ ‬Simmons‭ ‬-‭ ‬1965.
-‭ ‬Dinosaur Systematics:‭ ‬Perspectives and Approaches by Dong Zhiming.‭ ‬-‭ ‬In Cambridge University Press pp255-268,‭ ‬Kenneth Carpenter‭ & ‬Philip J.‭ ‬Currie‭ (‬eds.‭) ‬-‭ ‬1990.
-‭ ‬The thyreophoran dinosaur Scelidosaurus from the Lower Jurassic Lufeng Formation,‭ ‬Yunnan,‭ ‬China,‭ ‬by S.‭ ‬G.‭ ‬Lucas.‭ ‬-‭ ‬In,‭ ‬The Continental Jurassic.‭ ‬Museum of Northern Arizona Bulletin‭ ‬60.‭ ‬-‭ ‬M.‭ ‬Morales‭ (‬ed‭) ‬-‭ ‬1990.
-‭ ‬Reconsidering the status and affinities of the ornithischian dinosaur Tatisaurus oehleri Simmons,‭ ‬1965.‭ ‬-‭ ‬Zoological Journal of the Linnean Society‭ ‬150‭ (‬4‭)‬:‭ ‬865‭–‬874.‭ ‬-‭ ‬David B.‭ ‬Norman,‭ ‬Richard J.‭ ‬Butler,‭ ‬Susannah C.‭ ‬R.‭ ‬Maidment‭ ‬-‭ ‬2007.


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