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Koshisaurus
''Koshisaurus'' is a monospecific genus of basal hadrosauroid from the Kitadani Formation in Japan. The discovery of the genus suggests that hadrosauroids had higher diversity along the eastern margin of Asia in the Early Cretaceous.〔 "Koshi" means an old Japanese regional name including Fukui prefecture where fossils of the genus were discovered. ==Description== ''Koshisaurus'' was unlike most hadrosauroids due to the fact that it possessed an antorbital fossa, as well as three subsidiary ridges on its maxillary teeth, similar to those of ''Equijubus''. These ridges are also present on the genera ''Xuwulong'', ''Jinzhousaurus'' and ''Altirhinus''; but all three lack antorbital fossae, placing them as more advanced than ''Koshisaurus''.〔|〕
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「Koshisaurus」の詳細全文を読む
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