The thorax and pleon bear a number of lateral appendages, including the gills, and the tail ends with a telson.
另一个古老特征是甲壳物分足,足在化石中三叶虫就已经有了。
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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.
它们的外骨骼轻, 可以帮助它们更快,而被称为尾节的扁平尾巴则赋予它们额外的游泳能力。
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