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Songlingornithidae
Songlingornithidae is a family of early ornithuromorph birds from the early Cretaceous Period of China. All known specimens come from the Jiufotang Formation, dating to the early Aptian age, 120 million years ago.
The family Songlingornithidae was first named by Hou in 1997 to contain the type genus, ''Songlingornis''.〔Hou, (1997). ''Mesozoic Birds of China''. Taiwan Provincial Feng Huang Ku Bird Park. Taiwan: Nan Tou. 228 pp.〕 Clarke et al. (2006) was first to find a close relationship between ''Songlingornis'' and the "yanornithids".〔Clarke, Zhou and Zhang, (2006). "Insight into the evolution of avian flight from a new clade of Early Cretaceous ornithurines from China and the morphology of ''Yixianornis grabaui''." ''Journal of Anatomy'', 208: 287-308.〕
The name was originally coined to reflect a close relationship between the two supposedly similar (but poorly preserved) bird fossils, of the genera ''Songlingornis'' and ''Chaoyangia''. However, subsequent studies found that ''Chaoyangia'' was probably not closely related to ''Songlingornis''. Instead, ''songlingornis'' was found to be closely related to another group which had been given the name Yanornithidae--the name Songlingornithidae, having been named first, took precedence.〔O'Connor, J.K. and Zhou Z. (2012). "A redescription of ''Chaoyangia beishanensis'' (Aves) and a comprehensive phylogeny of Mesozoic birds." ''Journal of Systematic Palaeontology'', (advance online publication). 〕 Several more recent studies have found that the hongshanornithids are probably also a member of this group.〔 At least one study has found the late Cretaceous Mongolian bird ''Hollanda'' to be a member of this group.
== References ==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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