title: New material of Longipteryx (Aves: Enantiornithes) from the Lower Cretaceous Yixian Formation of China with the first recognized avian tooth crenulations.
abstract: We report on a new specimen of Longipteryx chaoyangensis from the Lower Cretaceous Yixian Formation in Chaoyang, Liaoning Province, China. The new material preserves previously unknown tooth crenulations. This is the first recognized tooth crenulations within Aves. It not only provides new information regarding the anatomy of the Longipteryx, but also sheds new light on the trophic specialization of this genus and even this family. It was discovered from the Yixian Formation, which is older than the Longipteryx chaoyangensis bearing-Jiufotang Formation. This new discovery also expands the known stratigraphic range of Longipteryx.
authors.affiliation: Institute of Geology, Chinese Academy of Geological Sciences; Key Laboratory of Paleontology and Stratigraphy, Ministry of Land and Resources, No. 26 Baiwanzhuang Road, Xicheng District, Beijing, PR China; Email: unknown.
authors.forename: Xuri
authors.initials: X
authors.lastname: Wang
authors.affiliation: Dalian Natural History Museum, No. 40 Xicun Street Heishijiao Shahekou District, Dalian City, Liaoning Province, PR China; Email: unknown.
authors.forename: Caizhi
authors.initials: C
authors.lastname: Shen
authors.affiliation: Dalian Natural History Museum, No. 40 Xicun Street Heishijiao Shahekou District, Dalian City, Liaoning Province, PR China; Email: unknown.
authors.forename: Sizhao
authors.initials: S
authors.lastname: Liu
authors.affiliation: Dalian Natural History Museum, No. 40 Xicun Street Heishijiao Shahekou District, Dalian City, Liaoning Province, PR China; Email: unknown.
authors.forename: Chunling
authors.initials: C
authors.lastname: Gao
authors.affiliation: Dalian Natural History Museum, No. 40 Xicun Street Heishijiao Shahekou District, Dalian City, Liaoning Province, PR China; Email: unknown.
authors.forename: Xiaodong
authors.initials: X
authors.lastname: Cheng
authors.affiliation: Dalian Natural History Museum, No. 40 Xicun Street Heishijiao Shahekou District, Dalian City, Liaoning Province, PR China; Email: unknown.
authors.forename: Fengjiao
authors.initials: F
authors.lastname: Zhang
mesh_terms: D000825:Animal Structures / Q000033:anatomy & histology / Q000254:growth & development; D000818:Animals; D001717:Birds / Q000033:anatomy & histology / Q000145:classification* / Q000254:growth & development; D049628:Body Size; D002681:China; D005580:Fossils / Q000033:anatomy & histology; D009929:Organ Size