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).
颚消
，
化为一条窄横片，下化为一小片（下须发达）。
,下,(无脊椎动物的)状部分,下瓣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).
颚消，化为一条窄横片，下化为一小片（下须发达）。
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