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Pedopenna
''Pedopenna'' (meaning "foot feather") is a genus of small, feathered, maniraptoran dinosaur from the Daohugou Beds in China. It is possibly older than ''Archaeopteryx'', though the age of the Daohugou Beds where it was found is debated. A majority of studies suggest that beds probably date from between the late Middle Jurassic (168 million years ago) and early Late Jurassic Period (164-152 million years ago).
The name ''Pedopenna'' refers to the long pennaceous feathers on the metatarsus; ''daohugouensis'' refers to the locality of Daohugou, where the holotype was found. ''Pedopenna daohugouensis'' probably measured 1 meter (3 ft) or less in length, but since this species is only known from the hind legs, the actual length is difficult to estimate. ''Pedopenna'' was originally classified as a paravian, the group of maniraptoran dinosaurs that includes both deinonychosaurs and avialans (the lineage including modern birds), but some scientists have classified it as a true avialan more closely related to modern birds than to deinonychosaurs.
==Description==
The feet of ''Pedopenna'' resembled those of the related troodontids and dromaeosaurids (which together form the group Deinonychosauria), though were overall more primitive. In particular, the second toe of ''Pedopenna'' was not as specialized as in deinonychosaurs. While ''Pedopenna'' did have an enlarged claw and slightly shortened second toe, it was not as highly developed as the strongly curved, sickle-like claws of its relatives.〔
Xu Xing and Zhang Fucheng, who interpreted the Daohugou fossil beds where ''Pedopenna'' was found as mid to late Jurassic in age, used the presence of such a primitive member of the avian lineage, in combination with many primitive members of closely related lineages there, to support the idea that birds originated in Asia.〔
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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