From ZooTerms (Dictionary of Invertebrate Zoology)
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alula (noun; plural alulae; Latin diminutive ala, wing): (Arthropoda: Insecta) 1. In some Diptera, one of the membranous lobes in the region of the wing base, thought to be part of the vannal region

See also: thoracic squama, alar squama. 2. In some Coleoptera, the alula is folded beneath the elytron/jugum.