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Eosinopteryx
''Eosinopteryx'' is an extinct genus of avialan theropod dinosaurs known the late Jurassic period of China. It contains a single species, ''Eosinopteryx brevipenna''. Though initially classified as a troodontid,〔 a more comprehensive analysis of its relationships found it to be either a primitive paravian or an avialan.
''E. brevipenna'' is known from a single fossil specimen recovered from the Tiaojishan Formation of western Liaoning Province, China, which has been dated to the late Jurassic period (Oxfordian age), about 160 million years ago. The name ''Eosinopteryx'' is derived from the Greek ''eos'' ("daybreak" or "dawn"), the Latin ''Sinae'' ("Chinese"), and the Greek ''pteryx'' ("feather"). The specific name ''brevipenna'' (from the Latin ''brevis'', "short", and ''penna'', "feather") refers to the reduced plumage preserved in the type specimen, YFGP-T5197.〔
==Description==
''Eosinopteryx brevipenna'' is known from a single fossil specimen representing the nearly complete skeleton of a subadult or adult individual. The specimen is very small for a non-avialan dinosaur, measuring about long. Unlike most troodontids, the snout was very short, shorter than the diameter of the eye socket. The wings were about the same size as those of the related ''Anchiornis huxleyi'', with the primary wing feathers being longer than the humerus (upper arm bone). An unusual arrangement of the wing bones would have prevented any flapping motion. The tail was very short compared to most troodontids and dromaeosaurids and also unlike members of those groups, the feet and toes were very slender, lacking highly curved claws for predation or climbing. Unusually, the tail of the only known fossil does not show signs of the presence of complex vaned feathers (rectrices), and the lower tarsals and feet appear to have been featherless, unlike many related species with "hind wings" on the lower legs and feet.〔
A researcher from the University of Southampton said the discovery of ''Eosinopteryx'' suggests "that the origin of flight was much more complex than previously thought".
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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