Name: Omeisaurus ‭(‬Omei lizard‭ ‬-‭ ‬after Omeishan Mountain‭)‬.
Phonetic: O-may-sore-us.
Named By: C.‭ ‬C.‭ ‬Young‭ ‬-‭ ‬1939.
Classification: Chordata,‭ ‬Reptilia,‭ ‬Dinosauria,‭ ‬Saurischia,‭ ‬Sauropoda,‭ ‬Mamenchisauridae.
Species: O.‭ ‬junghsiensis‭ (‬type‭)‬,‭ ‬O.‭ ‬changshouensis,‭ ‬O.‭ ‬fuxiensis,‭ ‬O.‭ ‬jiaoi,‭ ‬O.‭ ‬luoquanensis,‭ ‬O.‭ ‬maoianus,‭ ‬O.‭ ‬tianfuensis.
Diet: Herbivore.
Size: Around‭ ‬10‭ ‬to just over‭ ‬15‭ ‬meters long.‭ ‬Full size depends upon the species.
Known locations: China‭ ‬-‭ ‬Sichuan Province‭ ‬-‭ ‬Dashanpu/Lower Shaximiao Formation.‭ ‬Possibly also the Upper Shaximiao though these remains are widely regarded as being indeterminate.
Time period: Bathonian/Callovian of the Jurassic.
Fossil representation: Many individuals.

       With its incredibly long neck Omeisaurus is both a relative and possible comtempory to the more famous Mamenchisaurus.‭ ‬However previous Upper Shaximiao Formation fossils of Omeisaurus are now considered indeterminate.‭ ‬If Omeisaurus really‭ ‬does‭ ‬only exist in Lower Shaximiao deposits,‭ ‬then it may confirm that Mamenchisaurus replaced Omeisaurus since the former is only known from the later Upper Shaximiao.‭ ‬The large number of individual Omeisaurus recovered indicates that it was a successful design that was well suited to its environment.
       Other sauropod dinosaurs active at the same time and location as Omeisaurus include Abrosaurus,‭ ‬Dashanpusaurus and the clubbed tail Shunosaurus.‭ ‬Other herbivorous dinosaurs in the same time period and general area include the stegosaur Huayangosaurus and the small bipedal ornithischian Agilisaurus.‭ ‬Numerous predatory dinosaurs also roamed the landscapes and these include Chuandongocoelurus,‭ ‬Kaijiangosaurus,‭ ‬Gasosaurus,‭ ‬Leshansaurus,‭ ‬Xuanhanosaurus and Yangchuanosaurus.‭ ‬The last one in particular is important to Omeisaurus since it could attain sizes where it would have been a serious threat to smaller Omeisaurus,‭ ‬and still dangerous enough to worry larger individuals.


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