also called b-st-rd wing, spurious wing. the group of three to six small, rather stiff feathers growing on the first digit, pollex, or thumb of a bird’s wing.
a membranous lobe at the base of each wing of a dipterous insect.
historical examples

calypter: diptera; the alula or squama when it covers the haltere.
explanation of terms used in entomology john. b. smith

dead and wounded alike were horribly mutilated by order of alula.
encyclopaedia britannica, 11th edition, volume 15, slice 1 various

axillary incision: diptera; an incision on inner margin of wing, near base, which separates the alula from the main part.
explanation of terms used in entomology john. b. smith

axillary lobe: the sclerite covering the base of the wing in diptera; see also alula and posterior lobe.
explanation of terms used in entomology john. b. smith

noun (pl) -lae (-liː)
another name for b-st-rd wing

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