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節肢動物門的演化支 来自维基百科,自由的百科全书
蛛形类(学名:Arachnomorpha)是节肢动物门的一个分支,包括由三叶虫、其他大型附肢节肢动物和三叶虫类科(Helmtiidae、Xandarellidae、Naraoiidae、Liwiidae 和 Tegopeltidae)形成的单系群,以及包括螯肢在内的多样化姐妹进化枝。[1]
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