Name: Xiyunykus.
Phonetic: Zi-yun-e-kus
Named By: X.‭ ‬Xu,‭ ‬J.‭ ‬Choiniere,‭ ‬Q.-W.‭ ‬Tan,‭ ‬R.‭ ‬B.‭ ‬J.‭ ‬Benson,‭ ‬J.‭ ‬Clark,‭ ‬C.‭ ‬Sullivan,‭ ‬Q.‭ ‬Zhao,‭ ‬F.-L.‭ ‬Han,‭ ‬Q.-Y.‭ ‬Ma,‭ ‬Y.-M.‭ ‬He,‭ ‬S.‭ ‬Wang,‭ ‬H.‭ ‬Xing‭ & ‬L.‭ ‬Tan‭ ‬-‭ ‬2018.
Classification: Chordata,‭ ‬Reptilia,‭ ‬Dinosauria,‭ ‬Saurischia,‭ ‬Theropoda,‭ Alvarezsauridae.
Species: X.‭ ‬pengi‭ (‬type‭).
Diet: Insectivore‭?
Size: Roughly estimated around 2.3 meters long for the holotype.
Known locations: China.
Time period: Barremian/Aptian of the Cretaceous.
Fossil representation: Partial skeleton.

       Xiyunykus is a genus of alvarezsaurid dinosaur that lived in China during the early Cretaceous.‭ ‬In terms of alvarezsaur evolution,‭ ‬Xiyunykus shows an intermediate development between primitive ancestors and more developed descendents.
       Care should be taken not to confuse the Xiyunykus with the similarly named alvarezsaur Xixianykus.

Further reading
-‭ ‬Two early Cretaceous fossils document transitional stages in alvarezsaurian dinosaur evolution.‭ ‬-‭ ‬Current Biology‭ ‬28:2853-2860.‭ ‬-‭ ‬X.‭ ‬Xu,‭ ‬J.‭ ‬Choiniere,‭ ‬Q.-W.‭ ‬Tan,‭ ‬R.‭ ‬B.‭ ‬J.‭ ‬Benson,‭ ‬J.‭ ‬Clark,‭ ‬C.‭ ‬Sullivan,‭ ‬Q.‭ ‬Zhao,‭ ‬F.-L.‭ ‬Han,‭ ‬Q.-Y.‭ ‬Ma,‭ ‬Y.-M.‭ ‬He,‭ ‬S.‭ ‬Wang,‭ ‬H.‭ ‬Xing‭ & ‬L.‭ ‬Tan‭ ‬-‭ ‬2018.


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