From ZooTerms (Dictionary of Invertebrate Zoology)
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aculea (noun; plural aculeae; Latin diminutive acus, needle): (Arthropoda: Insecta) 1. In Diptera, one of the minute spines comprising the tomentum that covers the cuticula (except the wing membrane), usually dense in adults but sparse or absent in immatures. 2. In Lepidoptera, one of the minute spines on the wing membrane.