Multicellular thallophytes with differentiated tissues from Late Proterozoic phosphate rocks of South China
Multicellular thallophytes with differentiated tissues from Late Proterozoic phosphate rocks of South China
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DOI：
10.1111/j.1502-3931.1989.tb01674.x
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发表时间：
1989-04
期刊：
影响因子：
1.5
通讯作者：
Zhang Yun
中科院分区：
文献类型：
--
作者：
Zhang Yun
在贵州瓮安-福泉磷矿晚元古代陡山沱组（约680 Ma）磷矿岩中，发现了一组组织和显微结构保存完好的巨型多细胞盐生植物。建立了两个新属和三个新种：Thallophyca ramosa n. gen. et n. sp, Thallophyca simplica n. gen. et n. sp和Wengania globosa n. gen. et n. sp。Thallophyca的菌体嵌入无定形胶膜中，由可解释为皮层和髓质的分化组织和独特的结构（概念样腔和特殊的细胞群或“细胞岛”）组成。菌体的组织分化和巨大（毫米到向心）的大小表明，新属菌体可能代表一种原始的变质植物。新属Wengania归属于古生代藻群solenporaceae Pia。本研究为晚元古代变质植物提供了可靠的化石证据，并得出以下结论：(1)晚元古代埃迪卡拉纪出现了多种多样的多细胞盐生植物；(2)后生动物和后生动物的适应性辐射可能几乎同时发生；(3)前寒武纪磷矿可以保存微结构精致的巨型化石。
An assemblage of megascopic, multicellular thallophytes with well-preserved tissues and microstructures was discovered in phosphate rocks of the Late Proterozoic Doushantuo Formation (approximately 680 Ma old) at the Wengan-Fuquan Phosphate Mines, Guizhou Province, South China. Two new genera and three new species are erected: Thallophyca ramosa n. gen. et n. sp., Thallophyca simplica n. gen. et n. sp. and Wengania globosa n. gen. et n. sp. The thalli of Thallophyca are embedded in amorphous collophane and consist of differentiated tissues interpreted as cortex and medulla, and distinct structures (conceptacle-like cavities and special cell-groups or ‘cell-islands’). Tissue differentiation and megascopic (millimetric to centrimetric) size of the thalli suggest that the new genus Thallophyca may represent a primitive metaphyte. The new genus Wengania is assigned to the Paleozoic algal group Solenoporaceae Pia. This study provides reliable fossil evidence of Late Proterozoic metaphytes and leads to the following conclusions: (1) diverse multicellular thallophytes had evolved during Late Proterozoic Ediacaran time; (2) adaptive radiations possibly took place more or less contemporaneously in both metazoans and metaphytes, and (3) Precambrian phosphate rocks can preserve megafossils with delicate microstructures.