The mandibles are usually lost, the labrum is reduced to a narrow transverse sclerite, and the labium is a small flap ( though its palps retain quite large).
上颚消失，上唇
化为一条窄横片，下唇化为一小片（下唇须发达）。
,下唇瓣The mandibles are usually lost, the labrum is reduced to a narrow transverse sclerite, and the labium is a small flap ( though its palps retain quite large).
上颚消失，上唇化为一条窄横片，下唇化为一小片（下唇须发达）。
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