The thorax and pleon bear a number of lateral appendages, including the gills, and the tail ends with a telson.
另一个古老的特壳亚门动物分的足,这样的足中的三叶虫就已经有了。
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Telsons, they said, wanted no elbow room.
特尔森银行的人说,他们不外的空间。
They had thin, light-weight exoskeletons that helped them move faster, and flattened tails called telsons that gave them extra swimming power.
它们有轻薄的外骨骼, 有助于更快,并且有着被称为尾节的扁平尾巴, 这赋予了它们外的游泳力。
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