词
;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
退化为一条窄横片，
退化为一小片（
发达）。
,阴,
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，上退化为一条窄横片，退化为一小片（发达）。
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