根据发现于内蒙古宁城早白垩世义县组地层中一件保存近乎完整的亚成年鸟类标本,报道了早期今鸟型类一新属、新种——陈氏天宇鸟(Tianyuornis cheni gen.et sp.nov.)。新属种与红山鸟科(高冠红山鸟Hongshanornis longicresta,侯氏长腿鸟Longicrusavis houi及朝阳副红山鸟Parahongshanornis chaoyangensis)的特征最为相近,如体型大小相似,后肢明显长于前肢等;但也具有一系列与其他红山鸟科成员不同的特征,包括上下颌都保存有牙齿,齿骨直(特殊的“S”形齿骨曾被认为是红山鸟科鸟类的近裔特征),胸骨后外侧突远端呈扇形扩展等。这些特征表明新标本为红山鸟科一新属种。该新属种的发现使红山鸟科成为已知种属分化最丰富的早白垩世今鸟类群。另外,新标本也丰富了红山鸟科鸟类许多新的重要形态学信息,证实这一支系鸟类仍保留有牙齿结构。 According to a specimen of nearly adult avian bird preserved in the Yixian Formation of Early Cretaceous, Ningcheng, Inner Mongolia, a new genera and species of early bird are reported, Tianyuornis cheni gen. et sp.nov.). The new taxa are most similar in character to Redshanks (Hongshanornis longicresta, Longicrus avis houi and Parahongshanornis chaoyangensis), such as body size and hind limbs are significantly longer than forelimbs, but also have A series of different features from the other members of the Red Mountains family, including the preservation of teeth in both the upper and lower jaws, and the straight cusps (special “S” -shaped bones were once considered as the proximate feature of Redshanks) , Distal sternal lateral scoliosis fan-shaped expansion. These characteristics indicate that the new specimen is a new species of Redshank. The discovery of this new species has made the Redshank Bird Division the pre-Early Cretaceous present-day bird species known to have the highest species diversity. In addition, the new specimen enriches many new important morphological information of bird species in the Red Mountains, confirming that the bird still retains the tooth structure.