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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 Pteraspis ： ウィキペディア英語版 Pteraspis ''Pteraspis'' (meaning ''wing shield'') is an extinct genus of primitive jawless fish that lived in the Pragian epoch of the Devonian period in what is now Britain and Belgium. Like other heterostracan fishes, ''Pteraspis'' had a protective armored plating covering the front of its body. Though lacking fins other than its lobed tail, it is thought to have been a good swimmer thanks to stiff, wing-like protrusions derived from the armoured plates over its gills. This, along with the horn-like rostrum, made ''Pteraspis'' very streamlined in shape; a perfect quality for a good swimmer. ''Pteraspis'' also had some stiff spikes on its back, possibly an additional form of protection against predators. It is thought to have fed from shoals of plankton just under the ocean surface, and is found in association with marine fossils. ''Pteraspis'' grew to a length of 8 inches (20 centimeters). ==References== * Parker, Steve. Dinosaurus: the complete guide to dinosaurs. Firefly Books Inc, 2003. Pg. 59 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「Pteraspis」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.