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The Earliest Arthropods and Other Animals

机译：最早的节肢动物和其他动物

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A bacterial mat cover of sea-bottoms during the 1 st Epoch of the Cambrian (the Terreneuvian) hindered entire bodies to be preserved.What we find is dominantly isolatedparts,‘small shelly fossils'.More active burrowing then removed the mats,with the apparent ‘explosion' of life forms in the 2nd Cambrian Stage as one of the results.Many phyla have their first fossil appearance in the 2nd Stage.Some of them were already ‘modem' in their morphology and have not evolved much since.The arthropods provide an interesting example of the opposite situation.They are represented by many species and by well-preserved fossils,many of which are surprisingly little derived.The material thus opens for studies of the primary radiations.The related dinocaridids represent an interesting case of convergence including the development of segmented appendages.Both these groups have their roots among the lobopods.
机译：寒武纪（陆地）的第一个时期，海底的细菌垫覆盖物阻碍了整个身体的保存。我们发现主要是孤立的部分，即``小贝壳化石''。结果表明，在第二寒武纪阶段生命出现了明显的``爆炸''，许多门在第二阶段就首次出现化石，其中一些已经在形态上处于``现代''状态，自那以后就没有多少进化了。提供了一个有趣的相反情况的例子。它们由许多物种和保存完好的化石所代表，其中许多化石出奇的少。因此，该材料为主要辐射的研究开辟了空间。这两个群体的根源都在叶足类动物中。

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