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Labrum (arthropod mouthpart)

Modifications of the labrum (in red) in assorted insects. (A) grasshopper, (B) honey bee, (C) butterfly (D) mosquito.
Bembix rostrata female using its labrum in sucking the blood out of a fly.

The labrum is a flap-like structure that lies immediately in front of the mouth in almost all extant Euarthropoda. The most conspicuous exceptions are the Pycnogonida, which are probably chelicerates. In entomology, the labrum amounts to the "upper lip" of an insect mouth, the corresponding "lower lip" being the labium.

The evolutionary origin, embryogenesis, and morphological development of the labrum have proved to be some of the most controversial and challenging topics in the study of arthropod head structures.


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جاضم Arabic Labre Catalan Labrum German Labro Spanish Labrum (arthropode) French Labro GL Labbro superiore Italian 上唇 (節足動物) Japanese Labrum Dutch Warga górna Polish

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