Yandusaurus

Name: Yandusaurus ‭(‬Yandu lizard‭ ‬-‭ ‬Yandu is the old name for Zigong,‭ ‬a city in Sichuan Province,‭ ‬China‭)‬.
Phonetic: Yan-du-sor-us.
Named By: X.‭ ‬He‭ ‬-‭ ‬1979.
Classification: Chordata,‭ ‬Reptilia,‭ ‬Dinosauria,‭ ‬Ornithischia,‭ ‬Ornithopoda.
Species: Y.‭ ‬hongheensis‭ (‬type‭)‬.
Diet: Herbivore.
Size: At least three meters long for the holotype,‭ ‬possibly as much as somewhere between‭ ‬3.5‭ ‬and‭ ‬4‭ ‬meters.
Known locations: China,‭ ‬Sichuan Province‭ ‬-‭ ‬Lower Shaximiao Formation.
Time period: Bathonian of the Jurassic.
Fossil representation: Skull and partial post cranial skeleton.

       On a Chinese construction site in‭ ‬1973‭ ‬a dinosaur skeleton was accidentally processed by‭ ‬a‭ ‬mechanical composter.‭ ‬Unfortunately by the time the workers had realised what had happened much of the dinosaur had already been damaged and in some places completely destroyed by the machinery,‭ ‬but palaeontologists were still able to reconstruct and identify a new genus of dinosaur.
       Yandusaurus was a small bipedal dinosaur that was superficially similar to most of the small ornithischian dinosaurs‭ (‬such as Hypsilophodon‭) ‬that were running about during the Mid Jurassic.‭ ‬Despite significant damage to the holotype individual,‭ ‬we know that Yandusaurus had five fingered hands and four toed feet.‭ ‬With a length of at least three meters,‭ ‬Yandusaurus was already quite large for an ornithischian dinosaur of its kind,‭ ‬but still would have relied upon a combination of speed and agility to try and evade the jaws of predators.
       In‭ ‬1983‭ ‬a second species of Yandusaurus was named as Y.‭ ‬multidens,‭ ‬and represented by the fossil remains of about nine different individuals in varying states of completeness.‭ ‬However these individuals have since been determined to not represent a new species of Yandusaurus.‭ ‬Since this realisation Y.‭ ‬multidens has been‭ ‬re-classified as species of Agilisaurus‭ (‬Peng,‭ ‬1992‭) ‬and Othnielia‭ (‬Paul,‭ ‬1996‭)‬,‭ ‬before finally being described as a distinct genus in‭ ‬2005‭ (‬Barrett et al‭)‬.

Further reading
-‭ ‬A newly discovered ornithopod dinosaur Yandusaurus from Zigong,‭ ‬Sichuan,‭ ‬by X.‭ ‬He‭ ‬-‭ ‬In,‭ ‬Contributions to International Exchange of Geology.‭ ‬Part‭ ‬2.‭ ‬Stratigraphy and paleontology.‭ ‬Geol.‭ ‬publishing House,‭ ‬Beijing:‭ ‬pp.‭ ‬116-123.‭ ‬-‭ ‬1979.
-‭ ‬A new species of Yandusaurus‭ (‬hypsilophodont dinosaur‭) ‬from the Middle Jurassic of Dashanpu,‭ ‬Zigong,‭ ‬Sichuan.‭ ‬-‭ ‬Journal of Chengdu College of Geology Supplement‭ ‬1:‭ ‬5-14.‭ ‬-‭ ‬X.‭ ‬-L.‭ ‬He,‭ ‬K.‭ ‬-J.‭ ‬Cai‭ ‬-‭ ‬1983.
-‭ ‬The Middle Jurassic dinosaur fauna from Dashanpu,‭ ‬Zigong,‭ ‬Sichuan.‭ ‬Vol.‭ ‬I.‭ ‬The ornithopod dinosaurs.‭ ‬-‭ ‬Sichuan Scientific and Technological Publishing House,‭ ‬Chengdu‭ ‬1-71.-‭ ‬X.‭ ‬He‭ & ‬K.‭ ‬Cai‭ ‬-‭ ‬1984.
Small-bodied ornithischian dinosaurs from the Middle Jurassic of Sichuan,‭ ‬China.‭ ‬-‭ ‬Journal of Vertebrate Paleontology‭ ‬25‭(‬4‭)‬:823-834.‭ ‬-‭ ‬P.‭ ‬M.‭ ‬Barrett,‭ ‬R.‭ ‬J.‭ ‬Butler‭ & ‬F.‭ ‬Knoll‭ ‬-‭ ‬2005.



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