The thorax and pleon bear a number of lateral appendages, including the gills, and the tail ends with a telson.
另古老的特征是甲壳亚门动物分的足,这样的足在化石中的三叶经有了。
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Sea scorpions and true scorpions are actually sister clades that both belong to a Subphylum known as Chelicerata, an ancient group of arthropods that first appeared in the oceans of the Cambrian Period.
海和真正的际上姐妹分类群, 都属一个称为螯肢亚的亚,一个最早出现在寒武纪时期海洋中的古老节肢动物群体。
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