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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 Acanthodes ： ウィキペディア英語版 Acanthodes ''Acanthodes'' (meaning ''spiny base'' or ''thorny base'') is an extinct genus of spiny shark. Fossils have been found in Europe, North America, and Australia. ==Description== Compared with other spiny sharks, ''Acanthodes'' was relatively large, at long. The genus had no teeth, instead gills. Because of this, it is presumed to have been a filter feeder, filtering plankton from the water.〔 The Acanthodes has been found to have only a couple of skull bones. It was covered in scales that were cubical in shape. It also had fewer spines than many of its relatives. Each of the paired pectoral and pelvic fins had a spine, as did the single anal and dorsal fins, giving it a total of just six, less than half that of many other species.+ A fossil discovered near Hamilton, Kansas in the Upper Carboniferous Hamilton Formation, and published in 2014 as ''Acanthodes bridgei '' was so well-preserved that traces of its eye tissue were sufficient to establish that ''Acanthodes'' had both rod and cone photoreceptor cells, and thus profited from color vision.〔(NewsScienceMag, "Three hundred million year old fossil fish still has traces of eye tissue" ), 23 December 2014: accessed 23 December 2014.〕 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「Acanthodes」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.