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Palaeophragmodictya : ウィキペディア英語版 | Palaeophragmodictya
''Palaeophragmodictya'' is a Precambrian sponge-grade organism from the Ediacaran Period. Originally interpreted as a hexactinellid sponge,〔 〕 the organism also bears some coelomate characteristics, including bilateral symmetry. ==Morphology== The organisms take the form of a round bag, 7–68 mm in diameter, with an uneven margin. Radial grooves define sac-like compartments within the bag. The radial pattern has an element of bilateral symmetry. A stalk emerges from the central point of some specimens, at the top of the organism; in life, it probably extended into the water column. Ray-like filaments radiate outwards from the edge of the bag.〔 Some structures in the organism have been interpreted as spicules.〔
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「Palaeophragmodictya」の詳細全文を読む
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