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The Camerata or camerate crinoids are an extinct subclass of Paleozoic stalked crinoids. They originated in the Middle Ordovician and went extinct in the end-Permian mass extinction, and reached their maximum diversity during the Mississippian.〔Bibliography and index of Paleozoic crinoids, coronates, and hemistreptocrinoids, 1758–1999. G. D. Webster. Geological Society of America Special Papers, vol. 363, 2003.〕 Anatomically, they are distinguished by: 〔Treatise on Invertebrate Paleontology, Volume T. Echinodermata: Crinoidea. Ubaghs et al. Editors: R. C. Moore and C. Teichert. 1978.〕 *fused junctions between the plates of the cup *brachial plates incorporated into the cup *tegmen forming a rigid roof over the mouth *no less than ten and sometimes a very large number of free arms, often pinnulate == 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「Camerata (crinoid)」の詳細全文を読む スポンサード リンク
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