Mouthpart of insects and crustaceans
8 statements · 25% with external sources · numbers in brackets are citations
4 identifiers linking labrum across the web's reference databases
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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.