Key words: Aves, Enantiornithes, Cretaceous, Xinminpu Group, Xiagou Formation, China.

Matthew C. Lamanna lamannam@carnegiemnh.org, Section of Vertebrate Paleontology, Carnegie Museum of Natural History, 4400 Forbes Avenue, Pittsburgh, Pennsylvania 15213, USA (corresponding author); Hai-Lu You youhailu@sinofossa.org, Shu-An Ji jishu_an@sina.com, Jun-Chang Lü tmcp168@yahoo.com, and Qiang Ji jirod@cags.net.cn, Institute of Geology, Chinese Academy of Geological Sciences, 26 Baiwanzhuang Road, Beijing 100037, P.R. China; Jerald D. Harris jharris@dixie.edu, Dixie State College, Science Building, 225 South 700 East, St. George, Utah 84770, USA; Luis M. Chiappe lchiappe@nhm.org, The Dinosaur Institute, Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, California 90007, USA