头胸部(cephalothorax)是许多节肢动物的一个体段,包括相连的头部和胸部,与腹部截然相别。[1] 术语"cephalothorax"一词来自希腊语κεφαλή(头部,kephalé)和θώραξ(胸部,thórax)。[2] 最常见于螯肢亚门和甲壳亚门的生物身上,在其他诸如六足亚门生物身上头胸依旧是分离的。[1] 鲎和许多甲壳亚门动物的头胸部都有甲壳覆盖。[3]
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