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首页> 外文期刊>Proceedings of the Royal Society of London. Biological sciences >Soft-part anatomy of the Early Cambrian bivalved arthropods Kunyangella and Kunmingella: significance for the phylogenetic relationships of Bradoriida.
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Soft-part anatomy of the Early Cambrian bivalved arthropods Kunyangella and Kunmingella: significance for the phylogenetic relationships of Bradoriida.

机译：早寒武纪双壳节肢动物节肢动物节肢动物节肢动物的软组织解剖学：对Bradoriida系统发育关系的意义。

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摘要

Bradoriids are small bivalved marine arthropods that are widespread in rocks of Cambrian to Early Ordovician age. They comprise seven families and about 70 genera based on shield ('carapace') morphology. New bradoriid specimens with preserved soft-part anatomy of Kunmingella douvillei (Kunmingellidae) are reported from the Early Cambrian Chengjiang Lagerstatte of China together with, for the first time to our knowledge, a second bradoriid species with preserved soft parts, Kunyangella cheni (Comptalutidae). Kunmingella douvillei has a 10-segmented limb-bearing body with uniramous ninth and tenth appendages and a series of homogeneous, apparently (proximal parts not preserved) unspecialized post-antennal biramous limbs with setose leaf-shaped exopods. Each endopod consists of five podomeres. A presumed penultimate instar of Ky. cheni preserves remnants of three head and two trunk appendages, and the adult is reconstructed as having four head appendages. This material allows testing of the affinity of the Bradoriida. Kunmingella is identified as a stem crustacean in character-based analyses, through both morphological comparisons and cladistic reconstructions. Global parsimony analysis recovers a monophyletic Bradoriida as the sister group to crown crustaceans.
机译：Bradoriids是小型的双壳类海洋节肢动物，广泛分布于寒武纪至奥陶纪早期的岩石中。它们包括七个科，约有70属，属盾构形态。中国早期寒武纪澄江拉格施塔特报道了具有保留的软的昆明氏菌（Kunmingelladae）软部分解剖结构的新Bradoriid标本，并且据我们所知，这是第一次有第二个具有保留的软质部分的Bradoriid物种，即Kunyangella cheni（Comptalutidae）。 。昆明杆菌（Kunmingella douvillei）有一个十节肢体，具第九和第十肢附肢，并有一系列均质的，明显的（近端部分未保留的）非专业的肛门后双肢肢体，其呈濑状叶状外突。每个内足都由五个脚架组成。假想的倒数第二种Ky。cheni幼虫保留了三个头和两个躯干附肢的残余物，而成年人被重建为具有四个头附肢。这种材料可以测试Bradoriida的亲和力。通过形态学比较和分类重建，昆明氏菌在基于字符的分析中被鉴定为茎甲壳类动物。全球简约分析发现，单壳类Bradoriida是冠甲壳动物的姊妹组。

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