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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 Tropidosteus ： ウィキペディア英語版 Tropidosteus ''Tropidosteus curvatus''is a large, extinct holonematid arthrodire placoderm from the Givetian-aged Crinoidenmergel stratum of Middle Devonian Rheinland, Germany. ''T. curvatus'' is known from primarily from a slender, 42 centimeter long, arched median dorsal plate, where the two sides meet at a sixty to ninety degree angle, which would have given the live animal a humped appearance. The median dorsal plate is very similar to the median dorsal plates of ''Rhenonema'' and ''Belemnacanthus'', and is the primary reason for ''T. curvatus''' placement within Holonematidae. After stating this reason, Denison, 1978, then questions ''Tropidosteus placement within the family, noting that the dorsal plate lacks ridged ornamentation, which is a key diagnostic trait of the family. The ornamentation otherwise consists of an external covering of small tubercles. ==References== 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「Tropidosteus」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.