북연
The type species "Longchengornis sanyanensis" was in 1997 named and described by Hou Lianhai. The generic name "Longchengornis" combines the older name of Chaoyang, Longcheng or "Dragon City", with a Greek "ornis", "bird". The specific name refers to the Sanyan, the "Three Yan" as the discovery was made on the former territory of the three Yan kingdoms: the Former Yan, the Later Yan and the Northern Yan.