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Eopteranodon
''Eopteranodon'' (meaning "dawn ''Pteranodon'' (toothless wing)") is a genus of azhdarchoid pterodactyloid pterosaur from the Aptian-age Lower Cretaceous Yixian Formation of Beipaio City, Liaoning, China.
The genus was in 2005 named by Lü Junchang and Xang Xingliao. The type species is ''Eopteranodon lii''.
It is based on the type specimen or holotype BPV-078, an incomplete skeleton and skull. Its skull, including a large crest, was toothless and similar to that of ''Pteranodon''. The skull lacks the point of the snout but it was in life less than 200 millimeters long (7.9 inches), and the animal had a wingspan of about 1.1 meters (3.6 feet). A second specimen, D2526, described in 2006, had a larger wingspan. Despite its similarities to ''Pteranodon'', ''Eopteranodon'' was not placed into a family by its describers, who put it into the clade Pteranodontia as ''incertae sedis'' (uncertain position). Shortly thereafter, a phylogenetic study of all known Yixian pterosaurs by the same scientists found it to be close to the azhdarchoids, noted for the crested genera ''Tapejara'' and ''Tupuxuara'', and the giant, long-necked ''Quetzalcoatlus''. A further analysis of other recently discovered forms, in 2006 still considered basal to (having split off earlier than) azhdarchoids, helped the original authors, along with David Unwin, to place these species together with ''Eopteranodon'' in a new clade Chaoyangopteridae, the possible sister group of the Azhdarchidae.〔Lü, J., Unwin, D.M., Xu, L., and Zhang, X. (2008). "A new azhdarchoid pterosaur from the Lower Cretaceous of China and its implications for pterosaur phylogeny and evolution." ''Naturwissenschaften'',〕
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「Eopteranodon」の詳細全文を読む
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