submentum

From ZooTerms (Dictionary of Invertebrate Zoology)
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submentum (noun; Latin sub, under; mentum, chin): (Arthropoda: Insecta) 1. The basal sclerite of a labium. 2. In some Coleoptera, a distinct sclerite defined by a suture intervening between the mentum and the gula; in others, has also been applied to the undifferentiated anterior margin of the gula.