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REINTERPRETATION OF YUNNANOZOON AS THE EARLIEST KNOWN HEMICHORDATE

机译:作为最早已知的半氯酸盐重新解释云南带

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摘要

THE Chengjiang fossil Lagerstatte is one of the earliest and most important palaeontological sites from the Phanerozoic era(1,2) about 530 million years ago(3). It yields extremely abundant and remarkably preserved soft-bodied fossils and shells with soft parts of various kinds, including bradoriids(4-6), trilobites(7,8), crustaceans(9), brachiopods, worms, sponges, algae and many unknown forms(10-13). One of these fossils is Yunnanozoon(14), which we reinterpret here as the earliest known hemichordate. Possessing half of the characteristic chordate features and providing an anatomical link between invertebrates and chordates(15), Hemichordata is a minor but important phylum in evolutionary biology. Hemichordates comprise two main groups: the enteropneusts, or 'acorn worms', and the pterobranchs. Apart from the presumable inclusion of graptolites in pterobranchs(16-19), there are very few hemichordate fossils(2,17,20). Although Yunnanozoon is superficially similar to the chordates(21), its typical tripartite body plan is broadly consistent with that of living balanoglossid hemichordates (enteropneusts). [References: 27]
机译:澄江化石Lagerstatte是距今大约5.3亿年前的古生代(1,2)最早也是最重要的古生物学遗址之一(3)。它产生的软化石和壳极为丰富且保存完好,壳内有各种软部分,包括节肢动物(4-6),三叶虫(7,8),甲壳动物(9),腕足动物,蠕虫,海绵,藻类和许多未知的生物表格(10-13)。这些化石之一是云南oz(14),在这里我们将其重新解释为已知的最早的半酸盐。拥有半数特征的r酸盐特征并在无脊椎动物和脊索动物之间提供解剖学联系(15),半边data属在进化生物学中是次要但重要的门。半草酸盐主要分为两类:肠神经节或“橡子蠕虫”和翼状支。除了可能在蝶形分支中包含石粉岩(16-19)外,几乎没有半球形的化石(2,17,20)。尽管云南带在表面上类似于脊索动物(21),但其典型的三方体计划与活巴拉诺西德半酸盐(肠胃)基本一致。 [参考:27]

著录项

  • 来源
    《Nature》 |1996年第6573期|p. 428-430|共3页
  • 作者

    Shu D.; Chen L.; Zhang X.;

  • 作者单位

    NW UNIV XIAN DEPT GEOL XIAN 710069 PEOPLES REPUBLIC OF CHINA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 自然科学总论;
  • 关键词

    Rhabdopleurid hemichordate; Evolution;

    机译:横纹半球形;进化;

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