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euornithes
Euornithes (meaning "true birds" in Greek) is a natural group which includes the most recent common ancestor of all avialans closer to modern birds than to ''Sinornis''.
==Description==
Clarke ''et al''. (2006) found that the most primitive known euornithians (the Yanornithiformes) had a mosaic of advanced and primitive features. These species retained primitive features like gastralia (belly ribs) and a pubic symphysis. They also showed the first fully modern pygostyles, and the type specimen of ''Yixianornis'' (IVPP 13631) preserves eight elongated rectrices (tail feathers) in a modern arrangement. No earlier pygostylians are known which preserve a fan of tail feathers of this sort; instead, they show only paired plumes or a tuft of short feathers.
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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