From ZooTerms (Dictionary of Invertebrate Zoology)
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nesium (noun; plural nesia; Greek nesion, an islet): (Arthropoda: Insecta) In scarab beetle larvae, one or two sclerotized projecting marks between the inner end of the dexiotorma and crepis; when two are present, termed nesium externum and nesium internum; chitinous plate of Hayes.