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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Chaoyangsauridae ： ウィキペディア英語版 Chaoyangsauridae Chaoyangsauridae is a family of dinosaurs. They are the earliest known marginocephalian dinosaurs to appear on the planet, about 148 million years ago, in the Late Jurassic period. Members of this group had sharp beaks for snipping off leaves to eat, and a very small frill. There are disagreements that the chaoyangsaurids were part of the pachycephalosaurian group, ceratopsian group, or a different ancestral group. Two dinosaur genera, ''Chaoyangsaurus'' and ''Xuanhuaceratops'', are included in Chaoyangsauridae. Both animals are more primitive (or basal) than ''Psittacosaurus'', an early ceratopsian. ==See also== * Timeline of ceratopsian research 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「Chaoyangsauridae」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.