翻訳と辞書 Words near each other ・ Astrapian sicklebill ・ Astrapogon ・ Astrapometis ・ Astraponotus ・ Astrapotheria ・ Astrapotheriidae ・ Astrapotherium ・ Astraptes ・ Astraptes anaphus ・ Astraptes fulgerator ・ AstraQom ・ Astrarium ・ Astrarium of Giovanni Dondi dell'Orologio ・ Astras ・ Astraspida ・ Astraspis ・ Astratijs Roškovs ・ Astrauskas ・ Astravahini-class torpedo recovery vessel ・ Astravas Manor ・ Astravyets ・ Astravyets District ・ Astraweb ・ Astraxanovka ・ Astray ・ AstraZeneca ・ Astre ・ Astrea ・ Astrea, Cesar ・ Astrea, West End 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 Astraspis ： ウィキペディア英語版 Astraspis ''Astraspis'' ('star shield') is an extinct genus of primitive jawless fish from the Ordovician of Central North America and Bolivia (Gagnier, 1993) . It is related to other Ordovician fishes, such as the South American ''Sacabambaspis'', and the Australian ''Arandaspis''. ==Description== Nearly complete fossils suggest the living animals were about in length. The body had a mobile tail covered with small protective plate-like scales of less than and a forebody covered with plate-like scales larger than . The specimen from North America (described by Sansom et al., 1997) is to have had relatively large, laterally-positioned eyes and a series of eight gill openings on each side. The specimen was generally oval in cross-section. The protective bony plates covering the animal were composed of aspidin (chemically similar to modern shark's teeth), covered by tubercles composed of dentine.〔Sansom IJ, Smith MP, Smith MM and Turner P (1997) ("''Astraspis'': The anatomy and histology of an Ordovician fish" ) Palaeontology'', 40 (3): 625–642.〕 It is from these tubercles (which are generally star-shaped) that the name 'Astraspis' (literally "star-shield") is derived. 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「Astraspis」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.