;
门;
;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
为一条窄横片，下为一小片（下须发达）。
,阴,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).
上颚消失，上为一条窄横片，下为一小片（下须发达）。
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