口前葉

Multi tool use
口前葉(prostomium),又名前口節、前口葉、頭葉,是環節動物等有体節動物以在口一方為前的第一個體節。這部分位於口器所在的圍口節之前,往後延伸到口器的背部。
長在口前葉上的觸角是節足動物重要的感覺器官,也是一種特徵。通常節足動物的口前葉上在口器的後面的稱為附肢,而在口器前方的就是觸角[1]。節足動物門裡也有些是以觸角的型態來分類,例如昆蟲綱的觸角是一對,甲殼綱的觸角有兩對以及蛛形綱沒有觸角等[2]。
^ 頭部 とは とうぶ(日语). ;參看其中節足動物說明一節。
^ 昆蟲特徵 (中文). [失效連結]
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