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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 Francevillian biota ： ウィキペディア英語版 Francevillian biota The Francevillian biota (also known as Gabon macrofossils or Gabonionta) is a group of 2.1-billion-old Palaeoproterozoic, macroscopic organisms known from fossils found in the west-African country of Gabon in the Palaeoproterozoic Francevillian B Formation, a black shale province. The fossils have since been regarded as evidence of the earliest form of multicellular life. The fossils were discovered by an international team led by the Moroccan-French geologist Abderrazak El Albani, of the University of Poitiers, France. While the fossils have yet to be assigned to a formal taxonomic position, they have been informally and collectively referred to as the "Gabonionta" by the Natural History Museum Vienna in 2014.〔(Experiment Life – the Gabonionta ). (Press Release). 4 March 2014. Naturhistorisches Museum Wien〕 ==Morphology== The fossil organisms are up to 12 cm in size.〔 Their bodies were flattened disks with a characteristic morphology, including circular and elongated individuals. A spherical to ellipsoidal central body is bounded by radial structures. The fossils show three-dimensionality and coordinated growth. Cell-cell communication must be assumed as it existed before multi-cellularity arose. A newer 2014 study by El Albani et al. describes multiple types of fossils with different morphologies. There are convoluted tubes, and "string of pearls"-like structures that terminate in a "flower". This is similar to dictyostelids, amoebal organisms that form multicellular assemblies to migrate. However, dictyostelids are terrestrial, not marine organisms so the structures cannot simply be dictyostelids. Among known fossiles, the Ediacaran Nemiana and Beltanelloides are most similar.〔 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「Francevillian biota」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.