Longipterygidae

Longipteryx is a genus of prehistoric bird which lived during the Early Cretaceous (Aptian stage, 120.3 million years ago). It contains a single species, Longipteryx chaoyangensis. Its remains have been recovered from the Jiufotang Formation at Chaoyang in Liaoning Province, China. Apart from the holotype IVPP V 12325 - a fine and nearly complete skeleton — another entire skeleton (IPPV V 12552), some isolated bones (a humerus and furcula, specimens IPPV V 12553, and an ulna, IPPV V 12554) and many other specimens are known to date.

Longipterygidae is an extinct family of early enantiornithean avialans from the Early Cretaceous epoch of China and possibly Spain. All definitive specimens of this family come from the Jiufotang Formation and Yixian Formation, dating to the early Aptian age, 125–120 million years ago.

thumb|Speculative life restoration of Rapaxavis pani Rapaxavis a genus of enantiornithean bird. It has been found in the Jiufotang Formation in Liaoning, People's Republic of China.

Shanweiniao is a genus of long-snouted enantiornithean birds from Early Cretaceous China. One species is known, Shanweiniao cooperorum. There is one known fossil, a slab and counterslab. The fossil is in the collection of the Dalian Natural History Museum, and has accession number DNHM D1878/1 and DNHM1878/2. It was collected from the Lower Cretaceous Dawangzhengzi Beds, middle Yixian Formation, from Lingyuan in the Liaoning Province, China.

Boluochia is an extinct genus of enantiornithean bird. It lived during the Early Cretaceous in the time span 121.6-110.6 mya (late Aptian-early Albian) and is known from fossils found in the Jiufotang Formation of Liaoning province, People's Republic of China. Boluochia was first described by Zhou in 1995. A re-analysis of the specimen by Jingmai O'Connor and colleagues found that it was closely related to Longipteryx and could be assigned to the family Longipterygidae.

Longirostravis is a genus of enantiornithean birds which existed during the early Cretaceous period (around 125 million years ago) and is known from fossils found in the middle or upper Yixian Formation in Yixian County, People's Republic of China. It is known from a single specimen housed in the collections of the Institute of Vertebrate Paleontology and Paleoanthropology (specimen number IVPP V 11309) representing the type species Longirostravis hani.

Chromeornis (; ) is an extinct genus of longipterygid enantiornithean bird known from the Early Cretaceous (Aptian age) Jiufotang Formation of China. The genus contains a single species, Chromeornis funkyi, known from most of an articulated skeleton preserved on a slab and counterslab. This specimen was found with a mass of gastroliths in the esophagus, but these were likely not the gizzard stones expected in the gizzard of some birds. Instead, they may have been the result of an illness, with the animal dying after attempting to regurgitate them.