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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 Athyridida ： ウィキペディア英語版 Athyridida Athyridida is an order of Paleozoic a included in the Rhynchonellata, which makes up part of the articulate brachiopods.〔(Classification des Brachiopoda )〕〔(Athyridida-Paleodb )〕 The Athyridida are the Rostrospracea of R.C Moore, 1952,〔Moore, Lalcker and Fischer, 1952, Invertebrate Fossils, McGraw-Hill〕 considered at that time to be a suborder of the Spiriferida. As with the Spiriferida, the Athyridida have outwardly directed spiral brachidia that support the lophophores on either side, but instead have non-plicate shells with rounded outlines and prominent beaks but almost no inner areas on the pedicle valve. Athyridids began early in the Silurian, reached their greatest diversity in the following Devonian, and from then declined steadily until almost becoming extinct at the end of the Permian〔 The order rejuvenated somewhat during the Triassic, only to decline again until becoming extinct in the Jurassic. ''Athyris'', ''Composita'', and ''Meristella'' are representative genera. Three suborders have been defined. ==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「Athyridida」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.