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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 Agaricocrinus americanus ： ウィキペディア英語版 Agaricocrinus americanus ''Agaricocrinus americanus'', the mushroom crinoid, is a species of extinct crinoid, known only from its fossils, which are found in the U.S. states of Indiana, Tennessee and Kentucky. They date back to the Lower Mississippian, about 345 million years ago.〔(【引用サイトリンク】title=''Agaricocrinus americanus'' )〕 ==Fossil beds== One of the locations from which ''Agaricocrinus americanus'' is known is the Edwardsville Formation, in the vicinity of Crawfordsville, Montgomery County, Indiana, in the United States. In this fossil-rich bed have been found the fossils of sixty species of crinoid, distributed among more than forty genera. It is thought that the various species had different length stalks so that they could capture plankton drifting past at various heights above the substrate. The fossil beds were formed at a time when the seabed was much higher than it is today. It is believed that the crinoids were buried in sediment from nearby deltas during storms. The resulting siltstone deposits are soft enough for the fossils to be extracted in three-dimensional relief.〔(【引用サイトリンク】title=Crawfordsville crinoids )〕 Other fossils of this species have been found in similar sedimentary rocks in Whites Creek in Davidson County, Tennessee, from Osagean rocks in Kentucky, and more recently from the Fort Payne Formation near the boundary between Tennessee and Kentucky. Certain morphological differences have been found between various specimens from these different locations and new finds have often been claimed as new species. David Meyer and William Ausich studied the genus ''Agaricocrinus'' in 1997 and proposed that ''A. arcula'', ''A. dissimilis'', ''A. elegans'', ''A. podagricus'', ''A. ponderosus'', ''A. profundus'' and ''A. tugurium'' should be brought into synonymy with ''Agaricocrinus americanus''. A closely related but less common species is ''Agaricocrinus crassus''. 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「Agaricocrinus americanus」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.