Jaxartosaurus

Name: Jaxartosaurus ‭(‬Jaxartes lizard‭ ‬-‭ ‬after the Jaxartes River‭)‬.
Phonetic: Jax-art-o-sore-us.
Named By: Anatoly Nikolaenvich Riabinin‭ ‬-‭ ‬1938.
Synonyms: Jaxartosaurus fuyunensis,‭ ‬Procheneosaurus convincens.
Classification: Chordata,‭ ‬Reptilia,‭ ‬Dinosauria,‭ ‬Ornithischia,‭ ‬Ornithopoda,‭ ‬Hadrosauroidea,‭ ‬Hadrosauridae,‭ ‬Lambeosaurinae.
Species: J.‭ ‬aralensis‭ (‬type‭)‬.
Diet: Herbivore.
Size: Uncertain due to lack of fossils.
Known locations: China.‭ ‬Kazakhstan.
Time period: Coniacian/Santonian of the Cretaceous.
Fossil representation: Few specimens.

       Although not very well known,‭ ‬Jaxartosaurus possesses a hollow helmet shaped crest on top of its skull similar to the better known Corythosaurus.‭ ‬Because this crest is hollow,‭ ‬Jaxartosaurus had been confidently assigned to the Lambeosaurinae group of hadrosaurs which are typified by their hollow crests.‭ ‬The crest of Jaxartosaurus like its lambeosaurine relatives has an uncertain function,‭ ‬probably for visual display but perhaps also‭ ‬an auditory function as well.‭ ‬Other theories suggest theromoregulation for cooling the brain,‭ ‬to any combination of the above.
       Jaxartosaurus is named after the Jaxartes River,‭ ‬which is an ancient name for what is now called the Syr Darya River.‭ ‬The type species name of J.‭ ‬aralensis translates as‭ ‘‬from Aral‭’ ‬a region of Kazakhstan.‭ ‬A second species called J.‭ ‬fuyunensis and named by Weishampel and Horner in‭ ‬1990‭ ‬is now largely considered to be a synonym to the type species.‭
       Another genus of hadrosaur known from Kazakhstan is Aralosaurus,‭ ‬though this is named only from very partial remains.

Further reading
-‭ ‬Some results of the studies of the Upper Cretaceous dinosaurian fauna from the vicinity of the station Sary-Agach,‭ ‬South Kazakhstan,‭ ‬Anatoly N.‭ ‬Riabinin‭ ‬-‭ ‬1938.

-‭ [‬A fossil Jaxartosaurus is discovered in Xinjiang‭]‬,‭ ‬S.‭ ‬Z.‭ ‬Wu‭ ‬-‭ ‬1973.



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