The thorax and pleon bear a number of lateral appendages, including the gills, and the tail ends with a telson.
另个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虫有了。
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They had thin, light-weight exoskeletons that helped them move faster, and flattened tails called telsons that gave them extra swimming power.
它们的又薄又轻, 可以帮助它们更快地移动,为尾节的扁平尾巴则赋予它们额的游泳能力。
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