翻訳と辞書 Words near each other ・ Pterallastes ・ Pteralopex ・ Pteralyxia ・ Pteralyxia kauaiensis ・ Pteralyxia laurifolia ・ Pterandra ・ Pterandra isthmica ・ Pteranodon ・ Pteranodontidae ・ Pteranodontoidea ・ Pterapherapteryx ・ Pterapherapteryx sexalata ・ Pterarene ・ Pterarene sakashitai ・ Pteraspidiformes ・ Pteraspidomorphi ・ Pteraspis ・ Pteraster militaris ・ Pteraster tesselatus ・ Pterasteridae ・ Pterastheniinae ・ Pteredoa ・ Pterelaus ・ Ptereleotris ・ Ptereleotris evides ・ Ptereleotris hanae ・ Ptereleotris zebra ・ Pterengraulis atherinoides ・ Pterhemia ・ Pteri Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Pteraspidomorphi ： ウィキペディア英語版 Pteraspidomorphi Pteraspidomorphi is an extinct class of early jawless fish. They have long been regarded as closely related or even ancestral to jawed vertebrates, but the few characteristics they share with the latter are now considered as primitive for all vertebrates. ==Characteristics== Pteraspidomorphs are characterized by their massive dermal head armour having large, median, ventral and dorsal plates or shields. 〔Janvier, Philippe (1997) (Pteraspidomorphi ) ''The Tree of Life Web Project''.〕 The fossils show extensive shielding of the head. Many had hypocercal tails in order to generate lift to increase ease of movement through the water for their armoured bodies, which were covered in dermal bone. They also had sucking mouth parts and some species may have lived in fresh water. Most pteraspidomorphs were marine, but lived very near to the shore, in lagoons and deltas. Some groups are thought to have been fresh water. They were certainly bottom-dewellers, as shown by traces of abrasion of the ventral surface of their headshield. 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「Pteraspidomorphi」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.