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Cathayornis
''Cathayornis'' is a genus of enantiornithine birds from the Jiufotang Formation of Liaoning, People's Republic of China. It is known definitively from only one species, ''Cathayornis yandica'', one of the first enantiornithines found in China. Several additional species were once incorrectly classified as ''Cathayornis'', and have since been reclassified or regarded as ''nomina dubia''.
==Description==
''Cathayornis yandica'' was a small enantiornithine with a slightly elongated, toothy snout and perching feet. Like most other enantiornithines, it had large claws on the first two fingers that supported the wing. According to most recent studies, only one specimen can be definitively assigned to this species, a fossil catalogued as number IVPP V9769 and currently housed in the collections of the Institute of Vertebrate Paleontology and Paleoanthropology in Beijing. ''Cathayornis'' can be told apart from similar enantiornithines (especially ''Sinornis'', ''Eocathayornis'', and ''Houornis'') by its larger size, a shorter and straighter first finger with a slightly longer claw, and other anatomical details.〔Zhou, Zhonghe, Hou and Lianhai. (2001). "The Discovery and Study of Mesozoic Birds in China." In Chiappe, L. and Witmer, L. (eds.), ''Mesozoic Birds: Above the Heads of Dinosaurs''. 2001: University of California Press.〕 Two additional but very fragmentary specimens, IVPP V9936 and V10896, have been referred to ''C. yandica'' in the past, but cannot be directly compared with the type specimen because they do not preserve any of the same key parts of the skeleton.〔
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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