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首页> 美国卫生研究院文献>Proceedings of the National Academy of Sciences of the United States of America >Three-dimensionally preserved minute larva of a great-appendage arthropod from the early Cambrian Chengjiang biota
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Three-dimensionally preserved minute larva of a great-appendage arthropod from the early Cambrian Chengjiang biota

机译：寒武纪澄江早期生物群大附肢节肢动物的三维保存的幼虫

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摘要

A three-dimensionally preserved 2-mm-long larva of the arthropod Leanchoilia illecebrosa from the 520-million-year-old early Cambrian Chengjiang biota of China represents the first evidence, to our knowledge, of such an early developmental stage in a short-great-appendage (SGA) arthropod. The larva possesses a pair of three-fingered great appendages, a hypostome, and four pairs of well-developed biramous appendages. More posteriorly, a series of rudimentary limb Anlagen revealed by X-ray microcomputed tomography shows a gradient of decreasing differentiation toward the rear. This, and postembryonic segment addition at the putative growth zone, are features of late-stage metanauplii of eucrustaceans. L. illecebrosa and other SGA arthropods, however, are considered representative of early chelicerates or part of the stem lineage of all euarthropods. The larva of an early Cambrian SGA arthropod with a small number of anterior segments and their respective appendages suggests that posthatching segment addition occurred in the ancestor of Euarthropoda.
机译：据我们所知，从中国5.2亿年的寒武纪澄江早期生物区中节肢动物Leanchoilia illecebrosa的二维保存的2毫米长的幼虫中，我们就可以初步了解到这样一个早期发育阶段的初步证据。大附录（SGA）节肢动物。幼虫具有一对三指的大附件，一个假体和四对发达的双耳附件。后来，X射线计算机断层扫描显示的一系列残肢肢体Anlagen显示出向后逐渐减小的分化梯度。这以及在假定的生长区的胚后节段的添加，是欧壳纲动物后期变节节的特征。然而，L。illecebrosa和其他SGA节肢动物被认为是早期螯虫的代表或所有真肢动物的茎谱系的一部分。早期寒武纪SGA节肢动物的幼虫具有少量的前节和它们各自的附肢，这表明孵化后节的增加发生在Euarthropoda的祖先。

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