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Trinodus
''Trinodus'' is a very small to small (about ) blind trilobite, a well known group of extinct marine arthropods, which lived during the Ordovician (Tremadocian to early Hirnantian),〔 in what are now the Yukon Territories, Virginia, Italy, Czech Republic, Poland, Denmark, Sweden, Svalbard, Ireland, Scotland, Wales, Iran, Kazakhstan and China. It is one of the last of the Agnostida order to survive. == Etymology == ''Trinodus'' is derived from the Latin tri (three) and nodus (node). ''Arthrorhachis'' is derived from the Greek ἄρθρον (''árthron'', "joint") and ῥάχις (''rháchis'', meaning axis, spine, ridge or backbone).〔
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「Trinodus」の詳細全文を読む
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