Pengornis is the largest known enantiornithine bird from the Early Cretaceous of northeast China.

This holotype is in the collection of the Institute of Vertebrate Paleontology and Paleoanthropology in Beijing China.

It was collected from the Jiufotang Formation, at Dapingfang, Chaoyang, Liaoning China.

[1] Pengornis shows characters of the humeral head, acromion, and anterior cervical vertebrae, that were previously known only in members of the Ornithurae.

A phylogenetic analysis by Zhou et al. reduces to just three the number of characters that support enantiornithine monophyly.