sentences:  Longchengornis
  
  Longchengornis is a genus of enantiornithean birds which lived during the early Cretaceous Period, about 120 mya, and is known from a fossil found in the Jiufotang Formation in Liaoning province, People's Republic of China.It contains the single species "L. sanyanensis", though some researchers believe this to be a synonym of the similar species "Cathayornis yandica".