Name: Gilmoreosaurus ‭(‬Gilmores‭’ ‬lizard‭)‬.
Phonetic: Gil-mor-o-sor-us.
Named By: M.‭ ‬K.‭ ‬Brett-Surman‭ ‬-‭ ‬1979.
Synonyms: Mandschurosaurus mongoliensis.
Classification: Chordata,‭ ‬Reptilia,‭ ‬Dinosauria,‭ ‬Ornithischia,‭ ‬Ornithopoda,‭ ‬Hadrosauroidea.
Species: G.‭ ‬mongoliensis‭ (‬type‭)‬,‭ ‬G.‭ ‬atavus,‭ ‬G.‭ ‬arkhangelskyi.
Diet: Herbivore.
Size: Up to about‭ ‬6‭ ‬meters long.
Known locations: Mongolia‭ ‬-‭ ‬Iren Dabasu Formation.‭ ‬Uzbekistan‭ ‬-‭ ‬Khodzhakul Formation,‭ ‬Bissekty Formation.
Time period: Campanian of the Cretaceous.
Fossil representation: Remains of‭ ‬several individuals.

       The‭ ‬discovery of Gilmoreosaurus began in‭ ‬1923‭ ‬when the first fossil remains were discovered.‭ ‬These remains were however referred to the genus Mandschurosaurus as a new species,‭ ‬which is where they‭ ‬remained until a study by Brett-Surman in‭ ‬1979‭ ‬saw them re-identified as a distinct genus separate from Mandschurosaurus.‭ ‬Later in‭ ‬1995,‭ ‬two further species of Gilmoreosaurus were named from fossils discovered in Uzbekistan.‭ ‬The Uzbekistani species‭ (‬G.‭ ‬atavus and G.‭ ‬arkhangelskyi‭) ‬however are not always considered as belonging to Gilmoreosaurus upon the basis that they are based upon only fragmentary remains.‭ ‬Further discoveries in the future may be able to clarify.‭ ‬Fossils of another species G.‭ ‬kysylkumensis are now usually included into the Bactrosaurus genus.
       Gilmoreosaurus was a mid-sized hadrosauroid dinosaur,‭ ‬the kind that was very similar to hadrosaurid dinosaurs though not quite one,‭ ‬being slightly more primitive.‭ ‬Though more primitive however,‭ ‬Gilmoreosaurus still lived at the same time as the more advanced hadrosaurids,‭ ‬showing us the more primitive forms were not immediately displaced by their more developed descendants.‭
       At about six meters in length,‭ ‬Gilmoreosaurus was a medium sized hadrosauroid,‭ ‬and one that may have been preyed upon by large tyrannosaurs such as Alioramus and Tarbosaurus.

Further reading
-‭ ‬Phylogeny and palaeobiogeography of hadrosaurian dinosaurs.‭ ‬-‭ ‬Nature‭ ‬277:560-562‭ ‬0‭ ‬-‭ ‬M.‭ ‬K.‭ ‬Brett-Surman‭ ‬-‭ ‬1979.
-‭ ‬Anatomy and Relationships of Gilmoreosaurus mongoliensis‭ (‬Dinosauria:‭ ‬Hadrosauroidea‭) ‬from the Late Cretaceous of Central Asia.‭ ‬-‭ ‬American Museum Novitates‭ ‬3694:‭ ‬1-49.‭ ‬-‭ ‬A.‭ ‬Prieto-Márquez‭ & ‬M.A.‭ ‬Norell‭ ‬-‭ ‬2010.


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