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''Namapoikia rietoogensis'' is among the earliest known animals to produce a calcareous (probably aragonite) skeleton. Known from the Ediacaran period, before the Cambrian explosion of calcifying animals, the organism grew up to a metre in diameter and resembles a colonial sponge or cnidarian.〔Proterozoic Modular Biomineralized Metazoan from the Nama Group, Namibia: Rachel A Wood, John P. Grotzinger, J. A. D. Dickson: Science 28 June 2002: 2383 PMID 12089440〕 It was an encruster, filling vertical fissures in the reefs in which it originally grew. The fossil was first found in the Omkyk Member from Rietoog in southern Namibia, in association with another calcifying fossil, ''Cloudina''. ==See also== *Ediacaran biota: life forms of the time *''Cloudina ''and ''Namacalathus'', other calcifying Ediacaran fossils. *List of Ediacaran genera 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「Namapoikia」の詳細全文を読む スポンサード リンク
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