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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By losing the pleon—that long tail—they had one less delicious appendage that predators might grab onto.
通过失去 pleon——那条长长的尾——它们有了一个不那么美味的属,捕食者可能会抓住它。
Basically, the long " tail" of a lobster, called a pleon, grows shorter over time and gets tucked under the body.
基本上,龙虾的长“尾”, pleon, 随着时间的推移会变短, 并藏在身体下方。
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