头叶 head-lobe，dorsal fold，cephalicfold，anterior fold，cephalicod

互联网2013-11-14

575

　　〔 1〕为环节动物身体之最前部。同口前叶。

　　〔 2〕头褶系船蛆等穿钻性瓣鳃类口背方的外套膜左右形成皱褶而膨大的部分。

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