http://www.tolweb.org/Arthropoda
Hexapoda(六足类)
Crustacea(甲壳类)
Pauropoda(少脚纲)
Myriapoda(多足纲) Diplopoda(倍足纲)
Chilopoda(唇足亚纲)
Symphyla(综合纲)
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Arachnida(蛛形纲)
Chelicerate (螯肢) Eurypterida(板足鲎亚纲)
Xiphosura(剑尾亚纲)
Pycnogonida(海蜘蛛亚门)
Trilobites(三叶虫纲)