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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 Strophomenida ： ウィキペディア英語版 Strophomenida ''Strophomenida'' is a large, extinct order of articulate brachiopods that existed from the lower Ordovician to the lower Jurassic period. It was the largest known order of brachiopods, encompassing over 400 genera, including the largest and heaviest of known brachiopod shells. The strophomenids lost the ability to attach by the stalk in adult specimens, so they either lay free, attached the ventral valve at the umbo to a firm substrate, or balanced with their spines sunken into a soft substrate. Typically the dorsal valve was either concave or flat, though occasionally it was convex; the ventral valve was convex. Typically, a member of this order was wider than it was long. In juveniles, there was a tiny hole at the animal's umbo for a stalk to emerge from. Tiny bumps cover the interior of the valves. ==References== Image:StrophomenidCornulitidOrdovician.jpg|Strophomenid brachiopod with encrusting cornulitid tubeworm (Upper Ordovician, SE Indiana).]] 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「Strophomenida」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.